金属热处理外文及翻译
金属的热处理外文翻译
金属的热处理外文翻译外文资料翻译Heat Treatment of MetalThe generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions and I or properties.”Heating for the sole purpose of hot working(as in forging operations) is excludedfrom this definition．Likewise，the types of heat treatment that are sometimes used for productssuch as glass or plastics are also excluded from coverage by this definition．Transformation Curves.The basis for heat treatment is thetime-temperature-transformation curves or TTT curveswhere，in a single diagram all the three parameters are plotted．Because of the shape of thecurves，they are also sometimes called C-curves or S-curves．Material forming processesIn this section，a short description of the process examples will begiven. But assembly andjoining processes are not described here.ForgingForging can be characterized as: mass conserving, solid state of work material (metal), andmechanical primary basic process-plastic deformation. A wide variety of forging processes areused, and Fig.9.1(a) shows the most common of these: drop forging. The metal is heated to asuitable working temperature and placed in the lower die cavity. The upper die is then lowered sothat the metal is forced to fill the cavity.[1]Excess material is squeezed out between the die facesatthe periphery as flash, which is removed in a later trimming process. When the term forging isused, it usually means hot forging. Cold forging has several specialized names. The material lossin forging processes is usually quite small.Normally, forged components require some subsequent machining, since the tolerances andsurfaces obtainable are not usually satisfactory for a finished product. Forging machines includedrop hammers and forging presses with mechanical or hydraulic drives. These machines involvesimple translatory motions.金属的热处理普遍认同对金属及合金热处理的定义是，以一定的方式加热或冷却固态金属或合金，以达到一定的条件和/或获得某些性能。
金属的热处理 毕业论文外文文献翻译
英文及翻译Heat Treating of metalsHeatingFor this discussion, I will take you through the hardening process that I use on a high carbon steel blade, but first a few asides. When you place the steel in the fire it begins to gain heat. The steel will begin to give off visible color just above 900F it will continue to pick up color until it reaches a point where it seems to hang. It is still gaining heat, but it is undergoing an internal transformation from its cold structure into a metastable condition called austenite. This point at which it seems to hang is called decalescence and it represents the bottom of the critical temperature. It usually begins around 1335FIn carbon steel depending on the carbon content. Once it passes through this point, the crystal structure of the steel changes as the ferrite reacts with some of the carbide and begins to pool into austenite. As the temperature increases more of the austenite will begin to form in other places and continue until it reaches a point 10 or 15 degrees above the critical temperature where all of the ferrite should be consumed. At this point the steel should consist of austenite and undissolved carbides. The austenite grains start from a small nucleus and continue to grow until they impinge on other growing grains. The initial grain size is established at this point and if the excess carbide is in large quantities it will maintain this size with little increase, pinned by the carbide.You can see this transformation if you watch the steel carefully and bring the steel up slowly. The Japanese talked about watching the shadows on the blade and quenching when the shadows turned to liquid. If you take the blade out of the fire at this point and watch the colors drop, you will notice a point where the steel will brighten even as it is cooling. On a tapered cross section like a knife blade it will appear to travel up from the edge to the spine of the blade. This is call recalescence and represents the transformation from austenite back to pearlite. After I am done forging a blade, I cycle the blade just above critical and down to dark heat at leastthree times. I watch for these two points to establish critical in my mind and to set up a very fine grain pearlite structure in the steel.After reaching critical temperature, the steel should be fully austenized, but the carbides will continue to dissolve. It may be necessary to soak at temperature to fully dissolve all the carbides. In some steels it may be necessary to continue to raise the temperature for this to be accomplished especially in the presence of alloying elements that retard the transformation.Once the steel is above critical and austenite, it may be quenched and hardened. The structure of the steel can be established by carefully controlling the time it takes the steel drop from critical through the various temperature sensitive points.Transformations on CoolingAnnealing, normalizing, quenchingThe structure and hardness of the steel is established by the rate of cooling from the austenitic condition. If brought down slowly the steel will be annealed and soft. The structure will be mostly ferrite and cementite, carbides. This can be done in a temperature controlled furnace by dropping the temperature through a known rate over a set period of time dependent on the type of steel. Another method is to preheat a heavy bar of low carbon to the same temperature as critical for the steel and bury both of them together in vermiculite. It will slow the cooling rate down so that the blade will still be hot to the touch the next day. For most of the carbon steels this will be enough to anneal the piece.If allowed to air cool it will be normalized, a tougher condition comprised of fine pearlite and carbides. Blades can be prepared for heat treatment in either normalized or annealed states. Another treatment that is particularly effective for workability and for dimensional stability is called sphereodizing. With the steel in a normalized condition you reheat, usually in salt to inhibit oxidization, to a temperature just below lower critical, 1300F and hold for at least an hour. What occurs is that the carbideswill begin to aglomulate or pool into larger more evenly spaced particles in a ferrite matrix. It makes handfinishing much easier.It is important to precondition your blades not only because it helps workability, but also to stress relieve the steel after forging. This will reduce chances of cracking and warping in the quench. It is helpful to think of the forging stage as the beginning of the heat treatment and to pay careful attention to the heats especially in the final forging. My last heats are always at critical. When the blade is finally shaped, I cycle the blade just above critical and down to almost black heat at least three times, cooling between by moving it back and forth in the air gently.HardeningYou have a lot of options when it comes to hardening carbon steel. Even the slightest change in alloy content can make a remarkable difference in the hardening characteristics of the steel, so I would again encourage you to study the steels you will be using.The transformation temperatures and times are described using a chart that shows the Ae1 line, the temperature at which austenite begins to form and the Ms line, the temperature at which martensite starts to form from austenite.The time line at the bottom of the chart is in seconds and side bars give temperature. This is called an "S" curve chart and it is very useful in determining the quench speeds for each steel. The top curve of the "S" is known as the nose of the curve. When quenching from critical, the temperature of the steel must drop below the nose of the curve within a precise amount of time in order for the steel to harden to martensite. In this case, it must get below 900F in under five seconds to form martensite.MarquenchingIf the steel is quenched to below the Ms, martensite will be the predominate structure, however if the blade is quenched to a point slightly above the Ms point, say around 500F and held until it has stabilized at that temperature, the steel has thepromise to form martensite, but will not set up until it drops below Ms. This is called marquenching and is commonly used because it is less stressful particularly in difficult cross sections like we encounter in knife blades. When the blade is removed from the quench it is still above the Ms point and has very unusual properties. It can be easily bent or straightened and is still quite soft. As it cools however, it begins to setup martensite and will harden at room temperature. Again, you need to look at the chart for each steel you will be using because the Mf, or martensite finish point can be well below room temperature on some highly alloyed steels. These steels benefit from sub zero quenching because the colder temperatures are necessary to complete the austenite transformation and to reach the martensite finish. Care must be taken that the blade is not chilled by placing on a cold surface or even by being placed in a breeze or draft. The safest method is to allow it to cool in still air. The blade should be tempered after it has cooled to the point where it can be handled with bare hands.AustemperingIf the steel is quenched from Ae3, critical, to a point between the Ms and the nose of the curve, say 600F and held at temperature for a long time, the austenite will convert to banite. Banite is a much tougher structure than martensite and will maintain the hardness of the steel as tempered to that temperature. This process requires a salt bath and good controls, but makes an really tough spring and is being used by some makers on steels like 52100.QuenchantsThe method of controlling the speed of cooling is the quenchant. The quench rate is determined by how quickly the quenchant can remove the heat from the steel. When a piece of hot steel enters the quenchant the area surrounding the blade absorbs heat from the blade until it is heated itself.金属的热处理加热加热这种讨论,我将以高碳钢为例向你介绍其硬化过程.首先，你把钢铁放在火上加热时。
科技英语-钢的热处理.概要
译文：热处理是热处理工人用来改变金属
物理性能的方法。对钢进行热处理可采用三 种主要的操作：淬火、回火和退火。
Heat Treatment of Steel—钢的热处理 critical range：临界区
2. 淬 火 hardening
The hardening operation consists of heating the steel above its critical range and then quenching it, that is rapidly cooling in a suitable medium such as quench water, brine , oil, or some other liquid.
Heat Treatment of Steel—钢的热处理 heat-treater ：n.热处理工人
1.热处理的含 义 和 分 类
Heat treatment is a method by which the heat-treater can change the physical properties of a metal. There are three main operations in the heat treatment of steel: hardening, tempering, and annealing.
Heat Treatment of Steel—钢的热处理
4. 退 火 annealing
Annealing is the uniform heating of a metal above usual hardening temperatures, followed by very slow cooling.
Heat treatmant中英文术语对照
热处理术语中文名称英文名称说明1. 整体热处理{ Bulk heat treatment}[bʌlk]: 对金属材料或工件进行穿透加热的热处理工艺。
2. 局部热处理{Local heat treatment}:仅对工件的某一部位或几个部位进行热处理的工艺。
3. 表面热处理{Surface heat treatment}:仅对工件表层进行热处理以改变其组织和性能的工艺。
4.化学热处理{ Thermo-chemical treatment} ['θə:məu] ( adj. 热的；热电的):把金属材料或工件放在适当的活性介质中加热、保持，使一种或几种化学元素渗入其表层，以改变其化学成分、组织和性能的热处理工艺。
5.预备热处理(Conditioning heat treatment):为了调整原始组织，以保证工件最终热处理或（和）可加工性能，在最终热处理前预先进行的热处理。
6.可控气氛热处理{Heat treatmen in-controlled atmosphere}:为达到无氧化、无脱碳、按要求增碳的目的，在成分可以控制的炉气中进行加热和冷却的热处理工艺。
7. 真空热处理{Vacuum heat treatment} ['vækjuəm]:在一定真空度的加热炉中，可实现工件无氧化的热处理工艺。
8.离子热处理{Ion heat treatment}['aiən]: 在一定真空度的特定气氛中，利用工件(阴极)和阳极之间等离子体的辉光放电进行热处理的技术。
9. 高能束热处理{High energy density heat treatment}:利用激光、电子束、等离子弧、感应脉冲、涡流、火焰等高功率密度能源加热工件的热处理技术。
10.奥氏体化{Austenitizing} ['ɔstinitaiz, 'ɔstəni,taiz]:将钢铁加热至Ac3或Ac1以上，使原始组织全部或部分转变为奥氏体的工艺。
外文翻译--金属热处理
英文原文HEAT TREATMENT OF METAL AnnealingThe word anneal has been used before to describe heat-treating processes for softening and regaining ductility in connection with cold working of material. It has a similar meaning when used in connection with the heat treating of allotropic materials. The purpose of full annealing is o decrease hardness, increase ductility, and sometimes improve machinability of high carbon steels that might otherwise be difficult to cut. The treatment is also used to relieve stresses,refine grain size, and promote uniformity of structure throughout the material.Machinability is not always improved by annealing. The word machinability is used to describe several interrelated factors, including the ability of a material to be cut with a good surface finish. Plain low carbon steels, when fully annealed, are soft and relatively weak , offering little resistance to cutting, but udually having sufficient ductility and toughness that acut chip tends to pull and tear the surface from which it is removed, leaving a comparatively poor quality surface, which results in a poor machinability rating.1 For such steels annealing may not be the most suitable treatment. The machinability of many of the higher plain carbon and most of the alloy steels can usually be greatly improyed by annealing, as they are often too hard and strong to be easily cut at any but their softest condition.2 The procedure for annealing hypoeutectoid steel is to heat slowly to approximately 60 above the Ac3 line,3°°to soak for a long enough period that the temperature equalizes throughout the material and homogeneous austenite is formed, and then to allow the steel to cool very slowly by cooling it in the fumace or burying it in lime ot some other insulating material. The slow cooling is easential to the precipitation of the maximum ferrite and the coarsest pearlite to place the steel in its softest, most ductile, and least strained condition.NormalizingThe purpose of normalizing is somewhat similar to that of annealing with the exceptions that the steel is not reduced to its softest condition and the pearlite is left rather fine instead of coarse. Refinement of grain size, relief of internal stresses, and improvement ofstructural uniformity together with recovery of some ductility provide high toughness qualities in normalized steel. The process is frequently used for improvement of machinability and for stress relief to reduce distortion that might occur with partial machining or aging.The procedure for normalizing is to austenitize by slowly heating to approximately 80°above the Ao3 or Accm3 temperature for hypoeutectoid or hyereutectoid sreels, respectively.Providing soaking time for the formation of austenite; and cooling slowly in still air, Note that the steels with more carbon than the eutectoid composition are heated abou the Accm instead of the Ac13 used for annealing. The purpose of normalizing is to attempt to dissolve all the cementite during austenitization to eliminate, as far as possible, the settling of hard, brittle iron carbide in the grain boundaries. The desired decomposition products are smallgrained, fine pearlite with a minimum of free ferrite and free cementite1 SpheroidizingMinimum hardness and maximum ductility of steel can be produced by a process called spheroidizing, which causes the iron carbide to form in small spheres or nodules in a ferrite matrix. In order to start with small grains that spheroidize more readily, the process is usually performed on normalized steel. Several variations ofprocessing are used, but all require the holding of the steel near the A1 temperature {usually slightly below } for a number of hours to allow, the iron carbide to form on its more stable and lower energy state of small, rounded globules.The main need for the process is to improve the machinability quality of high carbon steel and to pretreat hardened steel to help produce greater structural uniformity after quenching. Because of the lengthy treatment time and therefore rather high cost, spheroidizing is not performed nearly as much as annealing or normalizing.Hardening of SteelMost of the heat treatment hardening processes for steel ate based on the production of high percebtages of martensite.The first step,therefore, is that used for most of the other heat-treating processes—treatmentto produce austenite. Hypoeutectoid steels ate heated to approximately 60°above the Ac3 temperature and allowed to soak to obtain temperature uniformity and austenite homogeneity. Hypereutectoid steels ate soaked at about 60°above the Ac1 temperature,which leaves some iron carbide present in the material.The second step involves cooling rapidly in an attempt to avoid pearlite transformation by missing the nose of the I—Tcurve.The cooling rate is determined by the temperature and ability of the quenching media to carry heat away from the surface of the material being quenched and by the conduction of heat through the material itself.Table 11—1 shows some of the commonly used media and the method of application to remove heat, arranged in order of decreasing cooling ability.High temperature gradients contribute to high stresser that cause distortion and cracking, so the quench should only as extreme as is necessary to produce the desired structure. Care must be exercised in quenching that heat is removed uniformly to minimize thermal stresses. For example, a long slender bar should be end-quenched, that is, inserted into the qudenching medium vertically so that the entire section is subjected to temperature change at one time. If a shape of this kind were to be quenched in a way that caused one side to drop in tempeiature before the other, change of dimensions would likely cause high stresses producing plastic flow and permanent distortion.Seyeral special types of quench are conducted to minimize quenching stresses and decrease the tendency for distortion and cracking. One of these is called martemoering and consists of quenching an austenitized steel in a salt at a temperature above that needed for the start of martensite formation (Ms).The steel being quenched is held in this bath until it is of uniform temperature but is removed before there is time for formation of bainite topletion of the cooling in air then causes the same hard martensite that would have formed with quenching from the high temperature,but the high thermal or “quench” stresses that are the primary source of cracks and warping will have been eliminated.A similar process performed at a slightly higher temperature is called austempering.In this case the steel is held at the bath temperature for a longer period,and the result of the formation of bainite.The bainite structure is not as hard as the martensite that could be formed from the same composition,but in addition to reducing the thermal shock to which the steel would be subjected under normal hardening procedures,it is unnecessary to perform any further treatment to develop good impact resistance in the high hardness range.4 TemperingA third step usually required to condition a hardened steel for swevice is tempering,or as it is sometimes referred to,drawing. With the exception of austempered steel,which is frequently used in the as—hardened condition,most steel are not serviceable “as quenched”.The drastic cooling to produce martensite causes the steel to be very hard and to contain both macroscopic internal stresses with the result that the material this little ductility and extreme brittleness. Reduction pg these faults is accomplished by reheating the steel to sometimes referred to, drawing. With the exception of austempered steel, which is frequently used in the as-hardened cognition, most steels are not serviceable “as quenched”, The drastic cooling to produce martensite causes the steel to be very hard and to contain both macroscopic and microscopic internal stresses with the result that the material has little ductility and extreme brittleness. Reduction of these faults is accomplished by reheating the steel to some point below the A1 (lower transformation) temperature.The structural changes caused by tempering of hardened steel are functions of both time and temperature, with temperature being the most important. It should be emphasized that tempering is not a hardening process, but is ,instead, the reverse. A tempered steel is one that has been hardened by heat treatment and then stress relieved, softened, and provided with increased ductility by reheating in the tempering or drawing procedure.The magnitude of the structural changes and the change of properties caused bytempering depend upon the temperature to which the steel is reheated. The higher the temperature, the greater the effect, so the choice of temperature will generally depend on willingness to sacrifice hardenss and strength to gain ductility and toughness. Reheating to below 100°has little noticeable effect on hardened plain carbon steel. Between 100°and 200°,there is evidence of some structural changes. Above 200°marked changes in structure and properties appear . Prolonged heating at just under the A1 temperature will result in a spheroidized structure similar to that produced by the spheroidizing process.In commercial tempering the temperature range of 250—425°C is usually avoided because of an unexplained embrittlement,or loss of ductility, that often occurs with steels tempered in this range of 425—600°C,particularly when cooled slowly from or through this range of temperature.when high temperature remperature tempering is necessary for these steels,they are usually headed to above600 ºC and quenched for rapid cooling. Quenchesfrom this temperature, of course ,do not cause hardening because austenitization has not been accomplished.附录B汉语翻译金属热处理一退火在前面描述冷拔加工材料的软化并重新获得塑性的热处理方法时，就已使用退火这个词。
金属热处理专业词汇
金属热处理专业词汇一、退火（Annealing [əˈniːlɪŋ]，名词）1. 完全退火（Full Annealing）- 定义：将亚共析钢加热到Ac3以上30 - 50℃，保温足够时间，使组织完全奥氏体化后缓慢冷却，以获得接近平衡组织的热处理工艺。
2. 不完全退火（Incomplete Annealing）- 定义：将亚共析钢加热到Ac1 - Ac3之间，保温后缓慢冷却的热处理工艺。
二、正火（Normalizing [ˈnɔːməlaɪzɪŋ]，名词）- 定义：将钢件加热到Ac3（或Accm）以上30 - 50℃，保温适当时间后在空气中冷却的热处理工艺。
其目的是细化晶粒、调整硬度、消除网状渗碳体等。
三、淬火（Quenching [ˈkwentʃɪŋ]，名词）1. 单液淬火（Single - liquid Quenching）- 定义：将加热到淬火温度的工件迅速放入一种淬火介质（如水、油等）中冷却到室温的淬火方法。
2. 双液淬火（Double - liquid Quenching）- 定义：工件先在一种冷却能力强的介质（如水）中冷却到接近Ms点（马氏体转变开始点），然后立即转入另一种冷却能力较弱的介质（如油）中冷却，以减少淬火内应力和变形开裂倾向的淬火方法。
四、回火（Tempering [ˈtempərɪŋ]，名词）1. 低温回火（Low - temperature Tempering）- 定义：回火温度在150 - 250℃之间，主要用于降低淬火应力、提高工件韧性，回火后得到回火马氏体组织，常用于高碳钢刀具、量具等的处理。
2. 中温回火（Medium - temperature Tempering）- 定义：回火温度在350 - 500℃之间，得到回火托氏体组织，可显著提高弹性极限和屈服强度，常用于各种弹簧的处理。
3. 高温回火（High - temperature Tempering）- 定义：回火温度在500 - 650℃之间，得到回火索氏体组织，可使工件具有良好的综合力学性能，生产中常把淬火加高温回火的复合热处理工艺称为调质处理。
外文翻译--金属热处理
外文原文Metal heat treatmentMetal heat treatment is a kind of craft to heat pieces of metals at the suitable temperature in some medium and to cool them at different speed after some time.The metal heat treatment is one of the important crafts in the machine-building, comparing with other technologies, the heat treatment seldom changes the form of the work pieces and chemical composition of the whole .it improve the serviceability of the work piece through changing their micro- work pieces, chemical composition, or surface. Its characteristic is improving inherent quality of work pieces which can not be watched by our eyes.In order to make the metal work piece have mechanics , physics and chemical property which are needed, besides the use of many materials and various kinds of crafts which are shaped , the heat treatment craft is essential. Steel is a wide-used material in the mechanical industry, its complicated micro-composition can be controlled through the heat treatment , so the heat treatment of the steel is a main content of the metal heat treatment . In addition aluminium, copper, magnesium, titanium and their alloys also can change their mechanics , physics and chemical property through the heat treatment to make different serviceability.During the process of development from the Stone Age to the Bronze Age and to the Iron Age, the function of the heat treatment is gradually known by people. As early as 770 B.C.~222 B.C., the Chinese in production practices had already found the performance of the copper and iron changed by press and temperature . White mouthfuls of casting iron’sgentle-treatment is a important craft to make farm implements.In the sixth century B.C., the steel weapon was gradually adopted. In order to improve the hardness of the steel, quench craft was then developed rapidly. Two sword and one halberd found in YANXIA, Hebei of China , had “MA structure” in its micro-composition which was quenched.With the development of quenching technology, people gradually found the influence of cold pharmaceutical on quality of quenching. Pu yuan a people of the Three Kingdoms(now, Shanxi province Xiegu town)made3000 knives for Zhu Ge-liang.the knives were quenched in Chengdu according to legend. This proved that the chinese had noticed the cooling ability of waters with different quality in ancient times, and the cooling ability of the oil and urine at the same time were found. People found a sword in Zhongshan tomb which were up to the Western Han Dynasty (B.C. 206 -A.D. 24 ),in whose heart department carbon was about 0.15-0.4%, but on whose surface carbon was about more than 0.6%.this has shown the use of the carburization craft. But as the secret of individual's " craftsmanship " at that time, the development was very slow.In 1863, Britain metallo graphy expert and geologist's discoverity that six kinds of different metallography organizations existed in the steel under the microscope, proved that the inside of steel would change while heating and cooling. the looks of steel at the high temperature would change into a harder looks when urgently colded. Frenchmen Osmon established Allotropic theory , and Englishmen Austin first made the iron- carbon looks picture .these tow theories set the theoretical foundation for the modern heat treatment craft . Meanwhile, people also studied the metal protection in the heating to avoid the metal's oxidizing and out of carbon inthe course.1850~1880s, there were a series of patent to use kinds of gases to heat (such as hydrogen , coal gas , carbon monoxide etc. ). Englishman's Rec obtained the patent of bright heat treatment of many kinds of metal in 1889-1890.Since the 20th century, the development of metal physics and transplantation application of other new technologies,make the metal heat treatment craft develop on a large scale even more. A remarkable progress was carburizition of gas in a tube of stoves in industrial production during 1901~1925; 1930s the appeariance of the electric potential different count and then the use of carbon dioxide and oxygen made stove carbon of atmosphere under control . In 1960s, hot treatment technology used the function of the plasma field, developed the nitrogen, carburization craft.The application of laser , electron beam technology, made the metal obtain new method about surface heat treatment and chemical heat treatment.The metal heat treatment craftThe heat treatment craft generally includes heating, keeping and cooling and sometimes only heating and cooling two progresses . The course links up each other.Heating is one of the important processes of the heat treatment . There are a lot of heating methods of the metal heat treatment . the first heat source were the charcoal and coal , then liquid and gaseous fuel. The application of the electricity is easy to control the heating, and no environmental pollution. the heat source could be heated directly or indirectly by the use of salt or metal of melting or the floating particle.While metal heated, the work piece in air , is often oxidized or take off carbon ( steel's surface carbon contentreduces).this does harm to the metal's surface performanc which is heated. Therefore metal should heat in the the vacuum or the melted salt, in controlled atmosphere or protected atmosphere . Sometimes it is heated in the protect means of coating or pack .Heating temperature is one of the important craft parameters of the heat treatment craft , choosing and controling heating temperature is a main matter of guaranting heat treatment quality. Heating temperature may change according to the different purposes of the heat treatment and different metal materials , but usually it is up to the temperature at which high temperature frame could be abtained.it must keep some time at the high temperature to make the inside and outside of the metal reach the some heating level,so that its micro-frame would turn out wholely.we call this period of time "keep-heat"time. There is no "keep-heat"time when adopting density heating and surface heat treatment of high energy because of the rapidity. But the chemical heat treatment often need much more time to sustain the heat .Cooling is an indispensable step in the craft course of heat treatment too . cooling methods are different because of crafts , mainly at controling the speed of cooling. generally anneals is slowest in speed, the cooling normalizing is a little fast in speed, the quenched cooling is much faster in speed. But there are different demands according to the kindof steel, for example empty hard steel can be cooled with normalize as quick as the speed by hard quench .The metal heat treatment craft can be divided into whole heat treatment , surface heat treatment and chemical heat treatment.Every kind could be divided into different crafts according to heating medium , heating temperature and coolingmethod. The same kind of metal adopting different heat treatment crafts can get different organizations which have different performance . The steel is the widest-used metal on the industry, and its micro- organization is the most complicated, so the steel heat treatment craft is various in style.The whole heat treatment is to change the whole mechanics performance of work piece through heating the work piece wholely and then cooling at the proper speed. The whole heat treatment of steel roughly has four basic crafts of annealing , normalizing , quenching and flashing back .Annealing means heating the work piece to the proper temperature ,then adopting different temperature retention time according to the material and size of work piece and then cooling slowly, whose purpose is to make the metal organization to achieve or close to the balance state, obtain good craft performance and serviceability, or prepare for quench further. normalizing is to cool in the air after heating the work piece at suitable temperature , its result is similar to annealing except that the organization out of normalizing are more refined which is often used to inhance the cutting performance of the material and is occationally used for the final heat treatment of material which are not high-requested. .Quenching is to cool work piece which has been heated and kept in warm fast in the cold medium as water , oil , other inorganic salts ,or organic aqueous solution and so on . The steel quenched becomes hard and fragile too. To reduce its fragility , we must first keep the quenched piece of steel in a certain temperature which is higher than room temperature but lower than 650℃for a long time,and then cool it again. this progress is called the flashing back . Annealing , normalizing,quenching , flashing back is " four fires " in the whole heat treatment . the quenching contact close to flashing back ,and they are often used together." Four fire "is divided into kinds of heat treatment crafts by different heating temperatures and diferent ways of cooling. What is " quality adjust " is a kind of craft combining "quench" with "high-temper a ture flash back" to make the work piece obtain certain intensity and toughness. Some alloy saturation out of quench can improve its hardness, intensity, electricity and magnetism after it is kept in the high proper temperature for a little long time . Such heat treatment craft is called “effective dealing”.Deformation-heat-treatment is the combination of pressure-deformation and heat treatment on work piece ,this mothod could enhance its intensity; and vacuum-heat-treatment is that work piece is heated in atmosphere or vacuum.It can make the work piece not oxidize or take off carbons , keep its surface bright and neat and improve its performance. At the same time ,it can carry on the chemical heat treatment by the pharmaceutics.Surface heat treatment on work piece is only to heat its cover to change the metal-layer's mechanics performance. In order to only heat the layer of work piece without making too much heat spreading into the inside, the heat source used must be of high density of energy , namely it can offer greater heat energy on the unit's area of the work piece and make its layer or parts reach high temperature in short-term or instantaneously. The main method of the surface heat treatment is "flame quenching" and "reaction heat" treatment and the heat source used commonly are flame as oxygen acetylene or propane, reaction electric current, laser and electron beam,ect.The chemical heat treatment is to alter the chemical composition, organization and performance of the top layer of work piece.The difference between Chemical and surface heat treatment is that the latter just change the chemical composition of the top layer of work piece . The former is to set the work piece heating in the medium (the gas , liquid , solid ) including carbon , nitrogen or other alloying elements,and then to keep it warm for longer time, thus to make elements as the carbon,nitrogen,boron and chromium,etc permeate through the top layer of work piece.Sometimes after permeation, there is other heat treatment craft to carry on such as quenching and flashing back . The main method of the chemical heat treatment include carbon,nitrogen, and metal permeation.The heat treatment is one of the important processes in machine components and tool and mould manufacture. Generally speaking, it guarantees and improves various kinds of performance of the work piece , for instance wear proof and anti-corrosion. It also improve the organization and state of the tough work piece to ensure various kinds of cooling and heating work.For example tin are annealed for a long time to turn into malleable cast iron which is of plasticity. proper heat treatment craft can prolong the gear wheel's service life at double or dozens of times than these without heat treatment ; In addition, the cheap carbon steel with some alloying elements permeated will own the alloy steel performance whose prices hold high so that it can replace some heat-resisting steel , stainless steel ; all tool and mould need to be through the heat treatment before in use..中文译文金属热处理金属热处理是将金属工件放在一定的介质中加热到适宜的温度，并在此温度中保持一定时间后，又以不同速度冷却的一种工艺。
金属材料及热处理工艺常用基础英语词汇翻译对照
金属材料及热处理工艺常用基础英语词汇翻译对照1X线结晶分析法X –ray crystal analyics method奥氏体Austenite奥氏体碳钢Austenite Carbon Steel奥氏铁孻回火Austempering半静钢Semi-killed steel包晶反应Peritectic Reaction包晶合金Peritectic Alloy包晶温度Peritectic Temperature薄卷片及薄片（0.3至2.9mm厚之片）机械性能Mechanical Properties of Thin Stainless Steel（Thickness from 0.3mm to 2.9mm）–strip/sheet杯突测试（厚度：0.4公厘至1.6公厘，准确至0.1公厘3个试片平均数）Erichsen test （Thickness：0.4mm to 1.6mm，figure round up to 0.1mm）贝氏体钢片Bainite Steel Strip比电阻Specific resistivity & specific resistance比较抗磁体、顺磁体及铁磁体Comparison of Diamagnetism，Paramagnetic & Ferromagnetism比热Specific Heat比重Specific gravity & specific density边缘处理Edge Finish扁线、半圆线及异形线Flat Wire，Half Round Wire，Shaped WirePrecision Shaped Fine Wire扁线公差Flat Wire Tolerance变态点Transformation Point表面保护胶纸Surface protection film表面处理Surface finish表面处理Surface Treatment不破坏检验Non –destructive inspections不锈钢Stainless Steel不锈钢–种类，工业标准，化学成份，特点及主要用途Stainless Steel –Type，Industrial Standard，Chemical Composition，Characteristic & end usage of the most commonly used Stainless Steel不锈钢薄片用途例End Usage of Thinner Gauge不锈钢扁线及半圆线常用材料Commonly used materials for Stainless Flat Wire & Half Round Wire不锈钢箔、卷片、片及板之厚度分类Classification of Foil，Strip，Sheet & Plate by Thickness不锈钢材及耐热钢材标准对照表StainlessHeat-Resisting Steels不锈钢的磁性Magnetic Property & Stainless Steel不锈钢的定义Definition of Stainless Steel不锈钢基层金属Stainless Steel as Base Metal不锈钢片、板用途例Examples of End Usages of Strip，Sheet & Plate不锈钢片材常用代号Designation of SUS Steel Special Use Stainless不锈钢片机械性能（301，304，631，CSP）Mechanical Properties of Spring use StainlessSteel不锈钢应力退火卷片常用规格名词图解General Specification of Tension Annealed Stainless Steel Strips不锈钢之分类，耐腐蚀性及耐热性Classification，Corrosion Resistant & Heat Resistance of Stainless Steel材料的加工性能Drawing abillity插入型固熔体Interstital solid solution常用尺寸Commonly Used Size常用的弹簧不锈钢线-编号，特性，表面处理及化学成份StainlessSpring Wire –National Standard number，Charateristic，Surface finish & Chemical composition 常用的镀锌钢片（电解片）的基层金属、用途、日工标准、美材标准及一般厚度Base metal，application，JIS & ASTM standard，Normal thickness of galvanized steel sheet 长度公差Length Tolerance超耐热钢Special Heat Resistance Steel超声波探伤法Ultrasonic inspection冲击测试Impact Test冲剪Drawing & stamping初释纯铁体Pro-entectoid ferrite处理及表面状况Finish & Surface纯铁体Ferrite磁场Magnetic Field磁畴Magnetic domain磁粉探伤法Magnetic particle inspection磁化率Magnetic Susceptibility （Xm）磁矩magnetic moment磁力Magnetic磁力Magnetic Force磁偶极子Dipole磁性Magnetisum磁性变态Magnetic Transformation磁性变态点Magnetic Transformation磁性感应Magnetic Induction粗珠光体Coarse pearlite淬火Quenching淬火及回火状态Hardened & Tempered Strip/ Precision – Quenched Steel Strip淬火剂Quenching Media单相金属Single Phase Metal单相轧压镀锡薄铁片（白铁皮/马口铁）Single-Reduced Tinplate弹簧不锈钢线，线径及拉力列表Stainless Spring Steel，Wire diameterTensile strength of Spring Wire弹簧用碳钢片CarbonSteel Strip For Spring Use弹簧用碳钢片材之边缘处理Edge Finished弹性限度、阳氏弹性系数及屈服点elastic limit，Yeung''s module of elasticity to yield point倒后擦发条Pull Back Power Spring导热度Heat conductivity低碳钢或铁基层金属Iron & Low Carbon as Base Metal低碳马氏体不锈钢Low Carbon Martensite Stainless Steel低温脆性Cold brittleness低温退火Low Temperature Annealing第二潜变期Secondary Creep第三潜变期Tertiary Creep第壹潜变期Primary Creep点焊Spot welding电镀金属钢片Plate Metal Strip电镀金属捆片的优点Advantage of Using Plate Metal Strip电镀锌（电解）钢片Electro-galvanized Steel Sheet电镀锌钢片的焊接Welding of Electro-galvanized steel sheet电镀锌钢片或电解钢片Electro-galvanized Steel Sheet/Electrolytic Zinc Coated Steel Sheet电解/电镀锌大大增强钢片的防锈能力Galvanic Action improving Weather & Corrosion Resistance of the Base Steel Sheet电解冷轧钢片厚度公差Thickness Tolerance of Electrolytic Cold-rolled sheet电炉Electric furnace电器及家电外壳用镀层冷辘[低碳] 钢片Coated （Low Carbon）Steel Sheets for Casing，Electricals & Home Appliances电器用的硅[硅] 钢片之分类Classification of Silicon Steel Sheet for Electrical Use电器用钢片的绝缘涂层Performance of Surface Insulation of Electrical Steel Sheets电器用钢片用家需自行应力退火原因Annealing of the Electrical Steel Sheet电器用硅[硅] 钢片Electrical Steel Sheet电阻焊Resistance Welding定型发条Constant Torque Spring定型发条的形状及翻动过程ShapeSpring Back of Constant Torque Spring定型发条及上炼发条的驱动力Spring Force of Constant Torque SpringWing-up Spring 定型发条驱动力公式及代号The FormulaSymbol of Constant Torque Spring镀层质量标记Markings & Designations of Differential Coatings镀铬Chrome Plated镀黄铜Brass Plated镀铝（硅）钢片–美材试标准（ASTM A-463-77）35.7 JIS G3314镀热浸铝片的机械性能Mechanical Properties of JIS G 3314 Hot-Dip Aluminum-coated SheetsCoils 镀铝（硅）钢片–日工标准（JIS G3314）Hot-aluminum-coated sheetscoils to JIS G 3314 镀铝（硅）钢片及其它种类钢片的抗腐蚀性能比较Comparsion of various resistance of aluminized steel & other kinds of steel镀铝（硅）钢片生产流程Aluminum Steel Sheet，Production Flow Chart镀铝硅钢片Aluminized Silicon Alloy Steel Sheet镀铝硅合金钢片的特色Feature of Aluminized Silicon Alloy Steel Sheet镀镍Nickel Plated镀锡薄钢片（白铁皮/马日铁）制造过程Production Process of Electrolytic Tinplate镀锡薄铁片（白铁皮/马口铁）（日工标准JIS G3303）镀锡薄铁片的构造Construction of Electrolytic Tinplate锻造Fogging断面缩率Reduction of area发条的分类及材料Power Spring Strip ClassificationMaterials发条片Power Spring Strip反铁磁体Antiferromagnetism方线公差Square Wire Tolerance防止生锈Rust Protection放射线探伤法Radiographic inspection非晶粒取向电力用钢片的电力、磁力、机械性能及夹层系数Lamination Factors of Electrical，Magnetic & Mechanical Non-Grain Oriented Electrical沸腾钢（未净钢）Rimmed steel分类Classification负磁力效应Negative effect钢板Steel Plate钢板订货需知Ordering of Steel Plate钢板生产流程Production Flow Chart钢板用途分类及各国钢板的工业标准包括日工标准及美材试标准Type of steel Plate & Related JIS，ASTMOther Major Industrial Standards钢材的熔铸、锻造、挤压及延轧The Casting，Fogging，Extrusion，Rolling & Steel 钢的脆性Brittleness of Steel钢的种类Type of Steel钢铁的名称Name of steel钢铁的制造Manufacturing of Steel钢铁的主要成份The major element of steel钢铁生产流程Steel Production Flow Chart钢铁用“碳”之含量来分类Classification of Steel according to Carbon contents高锰钢铸–日工标准High manganese steel to JIS standard高碳钢化学成份及用途High Carbon Tool Steel，Chemical CompositionUsage高碳钢片High Carbon Steel Strip高碳钢片用途End Usage of High Carbon Steel Strip高碳钢线枝High Carbon Steel Wire Rod （to JIS G3506）高温回火High Temperature Tempering格子常数Lattice constant铬钢–日工标准JIS G4104 Chrome steel to JIS G4104铬镍不锈钢及抗热钢弹簧线材–美国材验学会ASTM A313 –1987 Chromium –Nickel StainlessHeat-resisting Steel Spring Wire – ASTM A313 – 1987铬系耐热钢Chrome Heat Resistance Steel铬钼钢钢材–日工标准G4105 62 Chrome Molybdenum steel to JIS G4105各种不锈钢线在不同处理拉力比较表Tensile Strength of various kinds of Stainless Steel Wire under Different Finish工业标准及规格–铁及非铁金属Industrial Standard –Ferrous & Non –ferrous Metal公差Size Tolerance共晶Eutectic共释变态Eutectoid Transformation固熔体Solid solution光辉退火Bright Annealing光线（低碳钢线），火线（退火低碳钢线），铅水线（镀锌低碳钢线）及制造钉用低碳钢线之代号、公差及备注Ordinary Low Carbon Steel Wire，Annealed Low Carbon Steel Wire，Galvanized low Carbon Steel Wire & Low Carbon Steel Wire for nail manufacturing - classification，Symbol of Grade，ToleranceRemarks.硅含量对电器用的低碳钢片的最大好处The Advantage of Using Silicon low Carbon Steel滚焊Seam welding过共晶体Hyper-ectectic Alloy过共释钢Hype-eutectoid含硫易车钢Sulphuric Free Cutting Steel含铅易车钢Leaded Free Cutting Steel含铁体不锈钢Ferrite Stainless Steel焊接Welding焊接合金SolderingBrazing Alloy焊接能力Weldability 镀铝钢片的焊接状态（比较冷辘钢片）Tips on welding of Aluminized sheet in comparasion with cold rolled steel strip合金平衡状态Thermal Equilibrium厚度及阔度公差Tolerance on Thickness & Width滑动面Slip Plan化学成份Chemical Composition化学结合Chemical bond化学性能Chemical Properties化学元素Chemical element黄铜基层金属Brass as Base Metal回复柔软Crystal Recovery回火脆性Temper brittleness回火有低温回火及高温回火Low & High Temperature Tempering回火状态Annealed Strip基层金属Base Metal of Plated Metal Strip机械性能Mechanical Properites机械性能Mechanical properties畸变Distortion级别、电镀方法、镀层质量及常用称号Grade，Plating type，Designation of Coating Mass & Common Coating Mass级别，代号，扭曲特性及可用之线材直径Classes，symbols，twisting characteristicapplied Wire Diameters级别，代号及化学成份Classification，Symbol of GradeChemical Composition挤压Extrusion加工方法Manufacturing Method加工性能Machinability简介General交换能量Positive energy exchange矫顽磁力Coercive Force金属变态Transformation金属材料的试验方法The Method of Metal inspection金属材料的性能及试验Properties & testing of metal金属的特性Features of Metal金属的相融、相融温度、晶体反应及合金在共晶合金、固熔孻共晶合金及偏晶反应的比较Equilibrium Comparision金属间化物Intermetallic compound金属结晶格子Metal space lattice金属捆片电镀层Plated Layer of Plated Metal Strip金属塑性Plastic Deformation金属特性Special metallic features金属与合金MetalAlloy金相及相律Metal PhasePhase Rule晶粒取向（Grain-Oriented）及非晶粒取向（Non-Oriented）晶粒取向，定取向芯钢片及高硼定取向芯钢片之磁力性能及夹层系数（日工标准及美材标准）Magnetic PropertiesLamination Factor of SI-ORIENT-CORE& SI-ORIENT-CORE-HI B Electrical Steel Strip （JISAISI Standard）晶粒取向电器用硅[硅] 钢；片–高硼低硫（LS）定取向钢片之磁力及电力性能MagneticElectrical Properties of SI-ORIENT-CORE-HI-B-LS晶粒取向电器用硅[硅] 钢片–高硼（HI-B）定取向芯钢片及定取向芯钢片之机械性能及夹层系数Mechanical PropertiesLamination Factors of SI-ORIENT-CORE-HI-BSI-ORIENT-CORE Grain Orient Electrical Steel Sheets 晶粒取向电器用硅[硅] 钢片–高硼低硫（LS）定取向钢片之机械性能及夹层系数Mechanical PropertiesLamination Factors of SI-ORIENT-CORE-HI-B-LS晶粒取向电器用硅（硅）钢片–高硼（HI-B）定取向芯钢片，定取向芯钢片及高硼低硫（LS）定取向芯钢片之标准尺寸及包装Standard FormsSize of SI-ORIENT-CORE-HI-B，SI-CORE，& SI-ORIENT-CORE-HI-B-LS Grain-晶粒取向电器用硅（硅）钢片-高硼（HI-B）定取向芯钢片，定取向芯钢片及高硼低硫（LS）定取向芯钢片之厚度及阔度公差Physical Tolerance of SI-ORIENT-CORE-HI-B，SI-ORIENT-CORE，& SI-CORE-HI-B-LS Grain晶粒取向电器用硅钢片Grain-Oriented Electrical Steel晶粒取向电器用硅钢片主要工业标准International Standard –Grain-Oriented Electrical Steel Silicon Steel Sheet for Electrical Use晶体结构Crystal Pattern晶体结构，定向格子及单位晶格Crystal structure，Space lattice & Unit cell净磁矩Net magnetic moment绝缘表面Surface Insulation均热炉Soaking pit抗磁体Diamagnetism抗腐蚀及耐用Corrosion & resistance durability抗化学品能力Chemical Resistance抗敏感及环境保护Allergic，re-cycling & environmental protection抗热超级合金Heat Resistance Super Alloy扩散退火Diffusion Annealing拉尺发条Measure Tape拉伸测试（顺纹测试）Elongation test冷冲及冷锻用碳钢线枝Carbon Steel Wire Rods for Cold Heading & Cold Forging （to JIS G3507）冷拉钢板重量表Cold Drawn Steel Bar Weight Table冷拉钢枝材Cold Drawn Carbon Steel Shafting Bar冷拉高碳钢线Hard Drawn High Carbon Steel Wire冷轧钢片Cold-Rolled Steel Sheet/Strip冷轧高碳钢–日本工业标准Cold-Rolled （Special Steel）Carbon Steel Strip to JIS G3311 冷轧或热轧钢片阔度公差Width Tolerance of Cold or Hot-rolled sheet冷轧状态Cold Rolled Strip冷辘（低碳）钢片的分类用、途、工业标准、品质、加热状态及硬度表End usages，industrial standard，quality，conditionhardness of cold rolled steel strip冷辘低碳钢片（双单光片）（日工标准JIS G3141）73 - 95 Cold Rolled （Low carbon）Steel Strip （to JIS G 3141）冷辘钢捆片及张片的电镀和印刷方法Cold rolled steel coil & sheet electro-plating & painting method冷辘钢捆片及张片制作流程图表Production flow chart cold rolled steel coil sheet冷辘钢片（拉力：30-32公斤/平方米）在没有表面处理状态下的焊接状况Spot welding conditions for bared （free from paint，oxides etc）Cold rolled mild steel sheets（T/S：30-32 Kgf/ μm2）冷辘钢片储存与处理提示General advice on handling & storage of cold rolled steel coil & sheet冷辘钢片的“理论重量”计算方程式Cold Rolled Steel Sheet – Theoretical mass冷辘钢片订货需知Ordering of cold rolled steel strip/sheet理论质量Theoretical Mass连续铸造法Continuous casting process两面不均等锡层Both Side Different Thickness Coated Mass两面均等锡层Both Side Equally Coated Mass裂纹之容许深度及脱碳层Permissible depth of flawdecarburized layer临界温度Critical temperture马氏体不锈钢Martensite Stainless Steel马氏铁体淬火Marquenching埋弧焊Submerged-arc Welding每公斤发条的长度简易公式The Length of 1 Kg of Spring Steel Strip美材试标准的冷辘低碳钢片Cold Rolled Steel Strip American Standard –American Society for testingmaterials （ASTM）美国工业标准–不锈钢及防热钢材的化学成份（先数字后字母排列）AISI –Chemical Composition of Stainless Steel & Heat-Resistant Steel（in order of number & alphabet）金属材料及热处理工艺常用基础英语词汇翻译对照2米勒指数Mill''s Index魔术手环Magic Tape魔术手环尺寸图Drawing of Magic Tap耐热不锈钢Heat-Resistance Stainless Steel耐热不锈钢比重表Specific Gravity of Heat –resistance steel platessheets stainless steel 镍铬–日工标准G4102 63 Chrome Nickel steel to JIS G4102镍铬耐热钢Ni - Cr Heat Resistance Steel镍铬系不锈钢Nickel Chrome Stainless Steel镍铬系耐热不锈钢特性、化学成份、及操作温度Heat-Resistance Stainless Steel镍铬钼钢–日工标准G4103 64 Nickel，Chrome & Molybdenum Steel to JIS G4103疲劳测试Fatigue Test片及板材Chapter Four-Strip，Steel & Plate平坦度（阔度大于500公厘，标准回火）Flatness （width>500mm，temper：standard）破坏的检验Destructive Inspection其它焊接材料请参阅日工标准目录Other Soldering Material其它日工标准冷轧钢片（用途及编号）JIS standard & application of other cold RolledSpecial Steel气焊Gas Welding潜变测试Creep Test潜变强度Creeps Strength强度Strength琴线（日本标准G3522）Piano Wires （to G3522）球化退火Spheroidizing Annealing曲面（假曲率）Camber屈服强度（降伏强度）（Yield strangth）全静钢Killed steel热力应先从工件边缘透入Heat from the Laminated Stacks Edges热膨胀系数Coefficient of thermal expansion热轧钢片Hot-Rolled Sheet/Strip热轧钢片厚度公差Thickness Tolerance of Hot-rolled sheet日本工业标准–不锈钢的化学成份（先数字后字母排列）JIS –Chemical Composition of Stainless Steel （in order of number & alphabet）日工标准（JIS G3141）冷辘钢片化学成份Chemical composition – cold rolled steel sheet toJIS G3141日工标准（JIS G3141）冷辘钢片重量列表Mass of Cold-Rolled Steel Sheet to JIS G3141 日工标准JIS G3141冷辘低碳钢片（双单光片）的编号浅释Decoding of cold rolled（Lowcarbon）steel strip JIS G3141日工标准下的特殊钢材Specail Steel according to JIS Standard熔铸Casting软磁Soft Magnetic软磁材料Soft Magnetic Material软焊Soldering Alloy软焊合金–日本标准JIS H 4341 Soldering Alloy to JIS H 4341上链发条Wind-up Spring上漆能力Paint Adhesion伸长度Elongation渗碳体Cementitle渗透探伤法Penetrate inspection生产流程Production Flow Chart生锈速度表Speed of rusting时间淬火Time Quenching时间效应（老化）及拉伸应变Aging & Stretcher Strains释出硬化不锈钢Precipitation Hardening Stainless Steel双相辗压镀锡薄钢片（马口铁/白铁皮）Dual-Reduction Tinplate顺磁体Paramagnetic碳钢回火Tempering碳污染Prevent Carbon Contamination特点Characteristic特殊钢Special Steel特殊钢以用途来分类Classification of Special Steel according to End Usage 特殊钢以原素分类Classification of Special Steel according to Element提防过份氧化No Excessive Oxidation铁磁体Ferromagnetism铁铬系不锈钢片Chrome Stainless Steel铁及非铁金属Ferrous & Non Ferrous Metal铁锰铝不锈钢Fe / Mn / Al / Stainless Steel铁线（低碳钢线）日工标准JIS G 3532 Low Carbon Steel Wires （Iron Wire ）to JIS G3532铁相Steel Phases同素变态Allotropic Transformation铜基层金属Copper as Base Metal透磁度Magnetic Permeability退火Annealing退火时注意事项Annealing Precautionary外价电子Outer valence electrons弯度Camber完全退火Full Annealing物理性能Physical Properties物料科学Material Science物料科学定义Material Science Definition锡层质量Mass of Tin Coating （JIS G3303-1987）锡基、铅基及锌基轴承合金比较表Comparison of Tin base，Lead baseZinc base alloy forBearing purpose细线材、枝材、棒材Chapter Five Wire，Rod & Bar显微观察法Microscopic inspection线材/枝材材质分类及制成品ClassificationEnd Products of Wire/Rod线径、公差及机械性能（日本工业标准G 3521）Mechanical Properties （JIS G 3521）相反旋转Opposite span相律Phase Rule锌包层之重量，铜硫酸盐试验之酸洗次数及测试用卷筒直径Weight of Zinc-Coating，Number of Dippings in Cupric Sulphate TestDiameters of Mandrel Used for Coiling Test锌镀层质量Zinc Coating Mass锌镀层质量（两个不同锌镀层厚度）Mass Calculation of coating （For differential coating）/MM锌镀层质量（两个相同锌镀层厚度）Mass Calculation of coating （For equal coating）/MM亚共晶体Hypoeutetic Alloy亚铁磁体Ferrimagnetism亚铁释体Hyppo-Eutectoid延轧Rolling颜色Colour易车（快削）不锈钢Free Cutting Stainless Steel易车（快削）不锈钢拉力表Tensile Strength of Free Cutting Wires易车（快削）不锈钢种类Type of steel易车不锈钢及易车钢之不同尺寸及硬度比较Hardness of Different Types & Size of FreeCutting Steel易车碳钢Free Cutting Carbon Steels （to JIS G4804 ）易溶合金Fusible Alloy应力退火温度Stress –relieving Annealing Temperature应用材料Material Used硬磁Hard Magnetic硬磁材料Hard Magnetic Material硬度Hardness硬度及拉力Hardness & Tensile strength test硬焊Brazing Alloy硬化Work Hardening硬化性能Hardenability用含碳量分类–即低碳钢、中碳钢及高碳钢Classification According to CarbonContains用途End Usages用组织结构分类Classification According to Grain Structure幼珠光体Fine pearlite元素的原子序数Atom of Elements原子的组成、大小、体积和单位图表The size，mass，charge of an atom，is particles（Pronton，NentronElectron）原子的组织图Atom Constitutes原子及固体物质Atomsolid material原子键结Atom Bonding圆钢枝，方钢枝及六角钢枝之形状及尺寸之公差Tolerance on ShapeDimensions for Round Steel Bar，Square Steel Bar，Hexagonal Steel Bar圆径及偏圆度之公差Tolerance of Wire Diameters & Ovality圆面（“卜竹”）发条Convex Spring Strip再结晶Recrystallization正磁化率Positive magnetic susceptibility枝/棒无芯磨公差表（μ）（μ= 1/100 mm）Rod/Bar Centreless Grind Tolerance 枝材之美工标准，日工标准，用途及化学成份AISI，JIS End UsageChemical Composition of Cold Drawn Carbon Steel Shafting Bar直径，公差及拉力强度Diameter，ToleranceTensile Strength 直径公差，偏圆度及脱碳层的平均深度Diameter Tolerance，OvalityAverageDecarburized Layer Depth置换型固熔体Substitutional type solid solution滞后回线Narrow Hystersis中途退火Process Annealing中珠光体Medium pearlite周期表Periodic Table轴承合金Bearing Alloy轴承合金–日工标准JIS H 5401 Bearing Alloy to JIS H 5401珠光体Pearlite珠光体及共释钢Pearlite &Eutectoid主要金属元素之物理性质Physical properties of major Metal Elements转变元素Transition element自发上磁Spontaneous magnetization自由度Degree of freedom最大能量积Maximum Energy Product（to JIS G3521，ISO-84580-1&2）化学成份分析表Chemical Analysis of Wire Rod 305，316，321及347之拉力表Tensile Strength Requirements for Types 305，316，321347A1S1-302 贰级线材之拉力表Tensile Strength of A1S1-302 Wire Grain Oriented & Non-Oriented 电器用硅[硅] 钢片的最终用途及规格EndUsageDesignations of Electrical Steel StripOriented Electrical Steel SheetsSK-5 & AISI-301 每公尺长的重量/公斤（阔2.0-10公厘）Weight per one meter long （kg）（Width 2.0-10mm）SK-5 & AISI-301 每公斤长的重量/公斤（阔100-200公厘）Weight per one meter long（kg）（Width 100-200mm）SK-5 & AISI-301 每公斤之长度（阔100-200公厘）Length per one kg （Width100-200mm）SK-5 & AISI-301 每公斤之长度（阔2.0-10公厘）Length per one kg （Width 2.0-10mm。
Unit04金属热处理
“金属热处理”Unit 4 metallurgy 冶金(术) nickel 镍chromium 铬manganese 锰molybdenum 钼tungsten 钨vanadium 钒silicon 硅plain-carbon steel 普通碳素钢iron-carbon diagram 铁碳(合金相)图delta region 铁素体区eutectoid region 共熔体区，共析区austenite 奥氏体ferrite (plus carbide) 铁素体(加碳化物) fcc (face-centered cubic) 面心立方bcc (body-centered cubic) 体心立方in solid solution 固溶体状态cementite 渗碳体，碳化铁specimen样品，试样etching 侵蚀加工，洗nitric acid 硝酸lamellar 屈状的，多片的pearlite 珠光体mother-of-pearl 珠母层(珠光体层) hypoeutectoid 亚共析的hypereutectoid 过共析的tie-line 截线lever-law 杠杆定律leverage杠杆作用proeutectiod 先共析体equilibrium 平衡，均衡，安静hardening 淬火，硬化quench 急冷、淬火tempering 回火，调质annealing 退火drawing 回火martensite 马氏体normalizing 正火spheroidizing 球化处理，延期热处理carburizing 渗碳carbonitriding 碳氮共渗cyaniding 氰化处理nitriding 氮化处理0C(degree centigrade) 摄氏度0F(degree Fahrenheit) 华氏度Unit 4 HEAT TREATMENT OF METALS金属热处理(The understanding of heat treatment is embraced by the broader study of metallurgy.)深入研究冶金学可以掌握热处理的知识。
钢铁热处理中英文对照外文翻译文献
中英文对照外文翻译(文档含英文原文和中文翻译)原文:Heat Treatment of SteelTypes of Heat Treating Operations Five Operations are detailed in this lesson as the basis of heat treatment. Explanations of these operations follow.Full annealing Full annealing is the process of softening steel by a heating and cooling cycle, so that it may be bent or cut easily. In annealing, steel is heated above a transformation temperature and cooled very slowly after it has reached a suitable temperature. The distinguishing characteristics of full annealing are: (a) temperature abovethe critical temperature and (b) very slow cooling, usually in the furnace.Normalizing Normalizing is identical with annealing, except that the steel is air cooled; this is much faster than cooling in a furnace. Steel is normalized to refine grain size, make its structure more uniform, or to improve machinability.Hardening Hardening is carried out y quenching a steel, that is, cooling it rapidly from a temperature above the transformation temperature. Steel is quenched in water or brine for the most rapid cooling, in oil for some alloy steels, and in air for certain higher alloy steels. After steel is quenched, it is usually very hard and brittle; it may even crack if dropped. To make the steel more ductile, it must be tempered.Tempering Tempering consistes of reheating a quenched steel to a suitable temperature below the transformation temperature for an appropriate time and cooling back to room temperature. How this process makes steel tough will be discussed later.Stress relieving Stress relieving is the heating of steel to a temperature below the transformation temperature, as in tempering, but is done primarily to relieve internal stress and thus prevent distortion or cracking during machining.This is sometimes called process annealing.Reasons for Heat Treating Heat treatment of steel is usually intended to accomplish any one of the following objectives:●Remove stresses induced by cold working or toremove stresses set up by nonuniform cooling of hot metalobjects;●Refine the grain structure of hot worked steelswhich may have developed coarse grain size;●Secure the proper grain structure;●Decrease the hardness and increase the ductility;●Increase the hardness so as to increase resistanceto wear or to enable the steel to withstand more serviceconditions;●Increase the toughness; that is, to produce a steelhaving both a high tensile strength and good ductility,enabling it to withstand high impact;●Improve the machinability;●Improve the electrical properties;●Change or modify the magnetic properties of steel.Heat Treatment The hardest condition for any givens steel is obtained by quenching to a fully martensitic structure.Since hardness is directly related to strength, a steel composed of 100% martensite is at its strongest possible condition. However, strength is not the only property that must be considered in the application of steel parts. Ductility may be equally important.Tempering Ductility is the ability of a metal to change shape before it breaks. Fleshly quenched martensite is hard but not ductile; in fact, it is very brittle. Tempering is needed to impart ductility to the martensite, usually at a smell sacrifice in strength. In addition, tempering greatly increases the resistance of martensite to shock loading.The effect of tempering may be illustrated as follows. If the head of a hammer were quenched to a fully martensitic structure, it probably would crack after the first few blows. Tempering during manufacture of the hammer imparts shock resistance with only a slight decrease in hardness. Tempering is accomplished by heating a quenched pert to some point below the transformation temperature, and holding it at this temperature for an hour or more, depending on its size. Most steels are tempered between 205 and 5,950C. As higher temperatures are employed, toughness or shock resistance of the steel is increased, but the hardness and strength decrease.Annealing the two-stage heat treating process of quenching and tempering is designed to produce high strength steel capable of resisting shock and deformation without breaking. On the other hand, the annealing process is intend to make steel easier to deform of machine. In manufacturing steel products, machining and severe bending operations are often employed. Even tempered steel may not cut or bend very easily and annealing is often necessary.Process annealing Process annealing consists of heating steel to a temperature just below the lowest transformation temperature for a short time. This makes the steel easier to form. This heat treatment is commonly applied in the sheet and wire industries, and the temperatures generally used are from 550 to 650o C.Full annealing Process annealing, where steel is heated 50 to 100 o C above the third transformation temperature for hypoeutectoid steels, and above the lowest transformation temperature for hypereutectoid steels, and slow cooled, makes the steel much easier to cut, as well as bend. In full annealing, cooling must take place very slowly so that a coarse pearlite is formed. Show cooling is not essential for process annealing, since any cooling rate from temperatures below the lowesttransformation temperature will result in the same microstructure and hardness.During cold deformation, steel has a tendency to harden in deformed areas, making it more difficult to bend and liable to breakage. Alternate deforming and annealing operations are performed on most manufactured steel products.Normalizing The process of normalizing consists of heating to a temperature above the third transformation temperature and allowing the pert to cool in still air. The actual temperature required for this depends on the composition of the steel, but is usually around 870o C. Actually, the term normalize does not describe the purpose. The process might be more accurately described as a homogenizing or grain-refining treatment. Within any piece of steel, the composition is usually not uniform throughout. That is, one area may have more carbon than the area adjacent to it. These compositional differences affect the way in which the steel will respond t heat treatment. If it is heated to a high temperature, the carbon can readily diffuse throughout, and the result is a reasonably uniform composition from one area to next. The steel is then more homogeneous and will respond to the heat treatment in a more uniform way.Because of characteristics inherent in cast steel, the normalizing treatment is more frequently applied to ingots prior to working, and to steel castings and forgings prior to hardening.Stress Relieving When a metal is heated, expansion occurs which is more or less proportional to the temperature rise. Upon cooling metal, the reverse reaction takes place. That is, a contraction is observed. When a steel bar or plate is heated at one point more than at another, as in welding or during forging, internal stress are set up. During heating, expansion of the heated area cannot take place unhindered, and it tends to deform. On cooling, contraction is prevented from taking place by the unyielding cold metal surrounding the heated area. The forces attempting to contract the metal are not relieved, and when the metal is cold again, the forces remain as internal stresses. Stresses also result from volume changes, which accompany metal transformations and precipitation. Internal or residual stresses are bad because they may cause warping of steel parts when they are machined. To relieve these stresses, steel is heated to around 595o C, assuming that the entire pert is heated uniformly, then cooled slowly back to room temperature. This procedure is calledstress relief annealing, or merely stress relieving.译文：钢的热处理各种类型的热处理本单元详细介绍了五种热处理的基本方法。
毕业论文外文翻译--金属热处理(适用于毕业论文外文翻译+中英文对照)
2010 届Heat treatment of metal金属热处理姓名学号200615840114年级2006专业机械设计制造及其自动化系（院）工学院指导教师王宁宁2010 年01 月Heat treatment of metalIn industry today there are more than a thousand different metals being used to manufacture products. The modern automobile has more than one hundred different metals used in its construction. An attempt will be made in this passage to give an understanding of the basic classification of metals.Metals were formerly thought to be those elements that had a metallic luster and were good conductor of heat and electricity. Actually, metals are generally defined as those elements whose hydroxides from bases (such as sodium or potassium).the nonmetals’ hydroxides from acids (such as sulphur). Metals may exist as pure elements. When two or more metallic elements are combined,they form a mixture called an alloy The term alloy is used to identify any metallic system. In metallurgy it is a substance, with metallic properties, that is composed of two or more elements, in timately mixed. Of these elements one must be a metal. Plain carbon steel, in the sense, is basically an alloy of iron and carbon. Other elements are present in the form of impurities. However, for commercial purposes, plain carbon steel is not classified as an alloy steel.Alloy maybe further classified as ferrous and nonferrous. Ferrous alloys contain iron. Nonferrous alloys do not contain iron.All commercial varieties of iron and steel are alloys. The ordinary steels are thought of as iron-carbon alloys. However, practically all contain silicon and manganese as well. In addition, there are thousands of recognized alloy steels. Examples are special tool steels, steels for castings, forgings, and rolled shapes. The base metal for all these is iron.Steels are often called by the principal alloying element present. Examples are silicon steel, manganese steel, nickel steel, and tungsten steel. Even nonferrous alloys may contain iron in a small amount, as impurities. Some of the nonferrous alloys are bronze, brass, and monel.Although pure metals solidify at a constant temperature, alloys do not. The first nuclei have a tendency to form at a higher temperature than that at which complete solidification occurs. Each element in an alloy has its own peculiarities relative totemperature. Thus, the change in temperature as solidification progresses causes the solid being formed to change in chemical composition.Many alloying elements dissolve in the base metal in different proportions in liquefied and solidified steels. The proportion of the alloying element that remains in solid solutions has a tendency to vary with the temperature and grain structure of the alloy that is formed.Nonferrous metals are seldom formed in the pure state. They must be separated from the gangue before the ore can be reduced. Thus, a process known as ore-dressing is performed. Metals and metal compounds are heavier than the gangue. They settle to the bottom if such a mixture has been agitated in water. This process is similar to the method used by the early miners who panned for gold. However, refinements have been developed to speed up the accumulation of metal compound of metal compounds by using this principal.The reverberatory furnace is the type most often used in the smelting of nonferrous metals. This furnace is constructed of refractory brick with a steel structure on the outside. The charge is placed in the furnace and heated indirectly by the flame. Slag inducers or fluxes are added to the charge to reduce oxidation.Properties of metalsMetals have properties that distinguish them from other materials. The most important of these properties is strength, or the ability to support weight without bending or breaking. This property combined with toughness, or ability to bend without breaking, is important. Metals also have advantages regarding resistance to corrosion. They are responsive to heat treatment.Metals can be cast into many shapes and sizes. They can be welded, hardened,and softened. Metals also possess another important property-recycling and reuse. When a particular product is discarded, it can be cut into convenient sections. These sections can be put into a furnace, remelted, and used in another product.The properties of metals may be classified in three categories: chemical properties, mechanical properties, and physical properties. Here we will emphasize the primary mechanical properties of metals. In understanding the related areas ofmetalworking and methods used today, the mechanical properties of metals are of the utmost importance.The hardness of metals varies greatly. Some, like lead, can be indented easily. Others like tungsten carbide, approach diamond hardness. They are of great value as dies for cutting tools of various types. Heat treatment causes changes in the hardness. Annealed tool steel can readily be machined. Often, this is difficult after it has been hardened and tempered. Annealed brass is comparatively soft. When cold-worked the hardness is greatly increased.A tough metal possesses very high strength. It also has the capability to deform permanently and resist rupture. Toughness enables the metal to survive shock or impact without fracture.The strength of a metal is its ability to resist deformation or rupture. In certain items, a combination of strength and plasticity is desirable. Machine tools are an example.AnnealingThe word anneal has been used before to describe heat-treating processes for softening and regaining ductility in connection with cold working of material. It has a similar meaning when used in connection with the heat treating of allotropic materials. The purpose of full annealing is to decrease hardness, increase ductility, and sometimes improve machinability of highcarbon steels that might otherwise be difficult to cut. The treatment is also used to relieve stresses, refine grain size, and promote uniformity of structure throughout the material.Machinability is not always improved by annealing. The word machinability is used to describe several interrelated factors, including the ability of a material to be cut with a good surface finish. Plain low carbon steel, when fully annealed, are soft and relatively weak, offering litter resistance to cutting, but usually having sufficient ductility and toughness that a cut chip tends to pull and tear the surface from which it is removed, leaving a comparatively poor quality surface, which results in a poor machinablity of many of the higher plain carbon and most of the alloy steels canusually be greatly improved by annealing, as they are often too hard and strong to be easily cut at any but their softest condition.The procedure for annealing hypoeutectoid steel is to heat slowly to approximately 60℃ above the Ac3 line, to soak for a long enough period that the temperature equalizes throughout the material and homogeneous austenite is formed, and then to allow the steel to cool very slowly by cooling it in the furnace or burying it in the maximum ferrite and the coarsest pearlite to place the steel in its softest, most ductile, and least strained condition.NormalizingThe purpose of normalizing is somewhat similar to that of annealing with theExceptions that the steel is not to its softest condition and the pearlite is left rather fine instead of coarse. Refinement of grain size, relief of internalstresses, and improvement of structural uniformity together with recovery of someductility provide high toughness qualities in normalized steel. The process is frequently used for improvement of machinability and for stress relief to reduce distortion that might occur with partial machining or aging.The procedure for normalizing is to austenitize by slowly heating to approximate 80℃ above the AC3 or Accm3 temperature for hypoeutectoid or hypereutectoid.Steels, respectively; providing soaking time for the formation of austenite; and cooling slowly in still air. Note that the steels with more carbon than the eutectoid composition are heated above the Accm instead of the Ac13 used for annealing. The purpose of normalizing is to attempt to dissolve all the cementite during austenitization to eliminate, as for as possible, the settling of hard, brittle iron carbide in the grain boundaries. The desired decomposition products are smallgrained, fine pearlite with a minimum of free ferrite and free cementite.SpheroidizingMinimum hardness and maximum ductility of steel can be produced by a process called spheroidizing, which causes the iron carbide to form in small spheres or nodulesin a ferrite matrix. In order to start with small grains that spheroidize more readily, the process is usually performed on normalized steel. Several variations of processing are used, but all require the holding of the steel near the A1 temperature (usually slightly below)for a number of hours to allow the iron carbide to form on its more stable and lower energy state of small, rounded globules.The main need for the process is to improve the machinability quality of high carbon steel and to pretreat hardened steel to help produce greater structural uniformity after quenching because of the lengthy treatment time and therefore rather high cost, spheroidizing is not performed nearly as annealing or normalizing.Hardening of steelMost of the heat treatment hardening processes for the steel is the based on the production of high percentages of martensite .The first step, therefore, is that Used for most of the other heat-treating processes-treatment to produce austenite.Hypoeutectoid steels are heated to approximately 60℃ above the Ac3 temperature and allowed to soak to obtain temperature uniformity and austenite homogeneity. Hypereutectoid steels are soaked at about 60℃ above the Ac1 temperature, which leavesSome iron carbide present in the material.The second step involves cooling rapidly in an attempt to avoid pearlite transformation by missing the nose of the I-T curve. The cooling rate is determined by the temperature and the ability of the quenching media to carry heat away from the surface of the material being quenched and by the conduction of heat through the material itself. Table 11-1 shows some of the commonly used media and the method of application to remove heat, arranged in order of decreasing cooling ability.High temperature gradients contribute to high stresses that cause distortion and cracking, so the quench should only as extreme as is necessary to produce the desired structure. Care must be exercised in quenching that heat is removed uniformly to minimize thermal stresses. For example, along slender bar should be end-quenched, that is, inserted into the quenching medium vertically so that the entire section issubjected to temperature change at one time. If a shape of this kind were to be quenched in a way that caused one side to drop in temperature before the other, change of dimensions would likely cause high stresses producing plastic flow and permanent distortion.Several special types of quench are conducted to minimize quenching stresses and decrease the tendency for distortion and cracking. One of these is called martempering and consists of quenching and austenitized steel in a salt at a temperature above that needed for the start of martensite formation (Ms). The steel being quenched is in this bath until it is of uniform temperature but is removed before there is time for formation of bainite to start. Completion of the cooling in air then caused the same hard martenside that would have formed with quenching from the high temperature, but the high themal or “quench” stresses that are the primary source of cracks and warping will have been eliminatedA similar process performed at a slightly higher temperayure is called austempering. In this case the steel is the formation of bainite. The bainite structure is not as hard as the marten site that could be formed form the same form composition, but in addition n to reducing the thermal shock to which the steel would be subjected under normal hardening procedures, it is unnecessary to perform any further treatment to develop good impact resistance in the high hardness range.TemperingA third step usually required to condition hardened steel for service is tempering, or as it is sometimes referred to, drawing. With the exception of austempered steel, which is frequently used in the as-hardened condition, most steel are not serviceable “as quenched”. the drastic cooling to produce martensite causes the steel to be very hard and to contain both macroscopic and macroscopic internal stresses with the result that the material has little ductility and extreme brittle ness reduction of these faults is accomplished by reheating the steel to some point below the A1(lower transformation )temperature. Structural changes caused by tempering of hardened steel are functions of both time and temperature, with temperature being the most important. It should be emphasized that tempering is not a hardening process, but is, instead, the reverse. Atempered steel is one that has been hardened by heat treatment and then stress relieved, softened, and provided with increased ductility by reheating in the tempered or drawing procedure.The magnitude of the structural changes and the change of properties caused by tempering depend upon the temperature to which the steel is reheated. The higher the temperature, the greater the effect, so the choice of temperature will generally depend on willingness to sacrifice hardness and strength to gain ductility and toughness. Reheating to below 100℃ has little noticeable effect on hardened plain carbon steel. Between 100℃ and 200℃, there is evidence of some structural changes. Above 200℃ marked changes in structure and properties appear. Prolonged heating at just under the A1 temperature will result in a spheroidized structure to that produced by the spheroidizing process.In commercial tempering the temperature range of 250℃-425℃ is usually avoided because of an unexplained embrittlement, or loss of ductility, that often occurs with steels tempered in this range. Certain alloy steels also develop a “temper brittleness” in the tempe rature range of 425℃-600℃, particularly when cooled slowly from or through this range of temperature. When high temperature tempering is necessary for these steels, they are usually heated to above 600℃ and quenched for rapid cooling. Quenches from this temperature, of course, do not cause hardening because austenitization has not been accomplished.As we know, casting is a mechanical working process that forming a molten material into a desired shape by pouring it into a mold and letting it harden. When metal is not cast in a desired manner, it is formed into special shapes by mechanical working processes. Several factors must be considered when determining whether a desired shape is to be cast or formed by mechanical working. If the shape is very complicated, casting will be necessary to avoid expensive machining of mechanically formed parts. On the other hand, if strength and quality of material are the prime factors in a given part, a cast will be unsatisfactory. For this reason, steel castings are seldom used in aircraft work.There are there basic methods of metal-working. They are hot working, cold working, and extruding. The process chosen for a particular application depends upon the metal involved and the part required, although in some distances you might employ both hot5-and cold-working methods in making a single part.Almost all steel is hot-working from the ingot into some form from which it is either hot-or cold-worked to the finished shape. When an ingot is stripped from its mold, its surface is solid, but the interior is still molten. The ingot is then placed in s soaking pit, which retards loss of heat, and the molten interior gradually solidifies. After soaking, the temperature is equalized throughout the ingot, which is then reduced to intermediate size by rolling, making it more readily handled.Hot working is the process in which the ingot is deformed mechanically into a desired shape. Hot working is usually performed at an elevated temperature. At high temperature, scaling and oxidation exist. Scaling and oxidation produce undesirable surface finish. Often times, most ferrous metals need to be cold-worked after hot working in order to improve the surface finish.The main principle behind hot working is to cause plastic deformation within the material. The amount of force needed to perform hot working is normally less than that for cold working. As such, the mechanical properties of the material remain unchanged during hot working. The reason that the properties of the materials are unaltered comes from the fact that the deformation is performed above the metal recrystallization temperature. Plastic deformation occurs with metals when deformed at above the recrystallization temperature. Plastic deformation occurs with metals when deformed at above the recrystallization temperature without any strain hardening. As a matter of fact, the metal usually experiences a decrease in yield strength when hot-working. Therefore, it is possible to hot-work the metal without causing any fracture.Hot working has the following advantage:Elimination of porosity.Uniform distribution of impurities.Refinement of coarse or columnar grain-better physical properties.Lesser energy requirement to deform the metal into shape.Disadvantages of hot workingLower dimensional accuracy.Higher total energy required (due to thermal energy to heat the work-piece).Work surface oxidation (scale), poorer surface finish.shooter tool lifeThere are generally two types of hot working process: rolling and forging. Rolling is a process whereby the shape of the hot metal is altered by the action of the rollers which acts to “squeeze” the hot metal into desired shape and thickness. One advantage effect of hot rolling is the fact that there is a grain refinement. Refined grain usually possesses better physical properties.Forging is another hot working method. In forging, the metal is pounded by hammer that or squeezed between a pair of shaped dies. The die acts as a hammer that can “pound” the hot metal into shape. The metal is desired. Forging is done either by pressing or hammering the heated steel until the desired shape is obtained.Complicated sections that cannot be rolled, or sections of which only a small quantity is required, are usually forged. Forging of steel is a mechanical working of the metal above the critical range to shape the metal as desired. Forging is done either by pressing or hammering the heated steel until the desired shape is obtained.Pressing is used when the parts to be forged are large and heavy, and this process also replace hamming where high-grade steel is required. Since a press is show acting, its force is uniformly transmitted to the exterior to give the best possible structure as well as the exterior to give the best possible structure throughout.Hamming can be used only on relatively small piece. Since hamming transmits its force almost instantly, its effect is limited to a small depth. Thurs, it is necessary to use a very heavy hammer or to subject the part to repeated blows to ensure complete working of the section. If the force applied is too weak to reach the center, the finessed forging surface will be convex or bulged. The advantage of hammering is that the operator has control over the amount of pressure applied and the finishing temperature, and is able to produce parts of the highest grade.This type of forging is usually referred to as smith forging, and it is used extensively where only a small number of parts are needed. Considerable machining and saving when a part is smith forged to approximately the finished shape.金属热处理在现代工业中，有近千种金属应用于生产。
钢铁热处理中英文对照外文翻译文献
中英文对照外文翻译(文档含英文原文和中文翻译)原文:Heat Treatment of SteelTypes of Heat Treating Operations Five Operations are detailed in this lesson as the basis of heat treatment. Explanations of these operations follow.Full annealing Full annealing is the process of softening steel by a heating and cooling cycle, so that it may be bent or cut easily. In annealing, steel is heated above a transformation temperature and cooled very slowly after it has reached a suitable temperature. The distinguishing characteristics of full annealing are: (a) temperature abovethe critical temperature and (b) very slow cooling, usually in the furnace.Normalizing Normalizing is identical with annealing, except that the steel is air cooled; this is much faster than cooling in a furnace. Steel is normalized to refine grain size, make its structure more uniform, or to improve machinability.Hardening Hardening is carried out y quenching a steel, that is, cooling it rapidly from a temperature above the transformation temperature. Steel is quenched in water or brine for the most rapid cooling, in oil for some alloy steels, and in air for certain higher alloy steels. After steel is quenched, it is usually very hard and brittle; it may even crack if dropped. To make the steel more ductile, it must be tempered.Tempering Tempering consistes of reheating a quenched steel to a suitable temperature below the transformation temperature for an appropriate time and cooling back to room temperature. How this process makes steel tough will be discussed later.Stress relieving Stress relieving is the heating of steel to a temperature below the transformation temperature, as in tempering, but is done primarily to relieve internal stress and thus prevent distortion or cracking during machining.This is sometimes called process annealing.Reasons for Heat Treating Heat treatment of steel is usually intended to accomplish any one of the following objectives:●Remove stresses induced by cold working or toremove stresses set up by nonuniform cooling of hot metalobjects;●Refine the grain structure of hot worked steelswhich may have developed coarse grain size;●Secure the proper grain structure;●Decrease the hardness and increase the ductility;●Increase the hardness so as to increase resistanceto wear or to enable the steel to withstand more serviceconditions;●Increase the toughness; that is, to produce a steelhaving both a high tensile strength and good ductility,enabling it to withstand high impact;●Improve the machinability;●Improve the electrical properties;●Change or modify the magnetic properties of steel.Heat Treatment The hardest condition for any givens steel is obtained by quenching to a fully martensitic structure.Since hardness is directly related to strength, a steel composed of 100% martensite is at its strongest possible condition. However, strength is not the only property that must be considered in the application of steel parts. Ductility may be equally important.Tempering Ductility is the ability of a metal to change shape before it breaks. Fleshly quenched martensite is hard but not ductile; in fact, it is very brittle. Tempering is needed to impart ductility to the martensite, usually at a smell sacrifice in strength. In addition, tempering greatly increases the resistance of martensite to shock loading.The effect of tempering may be illustrated as follows. If the head of a hammer were quenched to a fully martensitic structure, it probably would crack after the first few blows. Tempering during manufacture of the hammer imparts shock resistance with only a slight decrease in hardness. Tempering is accomplished by heating a quenched pert to some point below the transformation temperature, and holding it at this temperature for an hour or more, depending on its size. Most steels are tempered between 205 and 5,950C. As higher temperatures are employed, toughness or shock resistance of the steel is increased, but the hardness and strength decrease.Annealing the two-stage heat treating process of quenching and tempering is designed to produce high strength steel capable of resisting shock and deformation without breaking. On the other hand, the annealing process is intend to make steel easier to deform of machine. In manufacturing steel products, machining and severe bending operations are often employed. Even tempered steel may not cut or bend very easily and annealing is often necessary.Process annealing Process annealing consists of heating steel to a temperature just below the lowest transformation temperature for a short time. This makes the steel easier to form. This heat treatment is commonly applied in the sheet and wire industries, and the temperatures generally used are from 550 to 650o C.Full annealing Process annealing, where steel is heated 50 to 100 o C above the third transformation temperature for hypoeutectoid steels, and above the lowest transformation temperature for hypereutectoid steels, and slow cooled, makes the steel much easier to cut, as well as bend. In full annealing, cooling must take place very slowly so that a coarse pearlite is formed. Show cooling is not essential for process annealing, since any cooling rate from temperatures below the lowesttransformation temperature will result in the same microstructure and hardness.During cold deformation, steel has a tendency to harden in deformed areas, making it more difficult to bend and liable to breakage. Alternate deforming and annealing operations are performed on most manufactured steel products.Normalizing The process of normalizing consists of heating to a temperature above the third transformation temperature and allowing the pert to cool in still air. The actual temperature required for this depends on the composition of the steel, but is usually around 870o C. Actually, the term normalize does not describe the purpose. The process might be more accurately described as a homogenizing or grain-refining treatment. Within any piece of steel, the composition is usually not uniform throughout. That is, one area may have more carbon than the area adjacent to it. These compositional differences affect the way in which the steel will respond t heat treatment. If it is heated to a high temperature, the carbon can readily diffuse throughout, and the result is a reasonably uniform composition from one area to next. The steel is then more homogeneous and will respond to the heat treatment in a more uniform way.Because of characteristics inherent in cast steel, the normalizing treatment is more frequently applied to ingots prior to working, and to steel castings and forgings prior to hardening.Stress Relieving When a metal is heated, expansion occurs which is more or less proportional to the temperature rise. Upon cooling metal, the reverse reaction takes place. That is, a contraction is observed. When a steel bar or plate is heated at one point more than at another, as in welding or during forging, internal stress are set up. During heating, expansion of the heated area cannot take place unhindered, and it tends to deform. On cooling, contraction is prevented from taking place by the unyielding cold metal surrounding the heated area. The forces attempting to contract the metal are not relieved, and when the metal is cold again, the forces remain as internal stresses. Stresses also result from volume changes, which accompany metal transformations and precipitation. Internal or residual stresses are bad because they may cause warping of steel parts when they are machined. To relieve these stresses, steel is heated to around 595o C, assuming that the entire pert is heated uniformly, then cooled slowly back to room temperature. This procedure is calledstress relief annealing, or merely stress relieving.译文：钢的热处理各种类型的热处理本单元详细介绍了五种热处理的基本方法。
科技英语-钢的热处理.概要
Heat Treatment of Steel—钢的热处理
8. 渗 碳 carburizaion
carburization n. 渗碳 Another method of the case hardening is carburization. The work is placed into a metal box containing carburizing materials (that is materials with high carbon content)；the box is closed and placed into a furnace for some hours at the temperature of 926 degrees Centigrade. 摄氏度 译文： 表面淬火的另一个方法是渗碳。工件被置于 含渗碳材料（即含碳量很高的材料）的金属箱中。封 闭箱子将其置于摄氏温度926的炉膛内数小时。
brine：n.盐水 quench：v. 淬火、熄灭
译文：淬火处理是指将钢材加热到其临界区 之上，然后降温—即在适当的介质如水、盐 水、油或其它液体中使之迅速冷却。
Heat Treatment of Steel—钢的热处理
consists of
组成，构成，包括，由…组成
1.The United Kingdom consists of Great Britain and Northern Ireland. 联合王国包括大不列颠与北爱尔兰。 2.His job consists of helping old people who live alone. 他的工作包括帮助无人照顾的独居老人。 3.Substances consist of small particles called molecules. 物质是由叫做分子的微粒组成的。
金属热处理外文文献及翻译
The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature(usually50°F to100°F or28℃to56℃)above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels,the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys,normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment,notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations.The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening,annealing,or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate.It is used primarily to soften metallic materials,but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be,but is not confined to,improvement of machinability,facilitation of cold work(known as in-process annealing),improvement of mechanical or electrical properties,or to increase dimensional stability.When applied solely to relive stresses,it commonly is called stress-relief annealing,synonymous with stress relieving.When the term“annealing”is applied to ferrous alloys without qualification,full annealing is applied.This is achieved by heating above the alloy’s transformation temperature,then applying a cooling cycle which provides maximum softness.This cycle may vary widely,depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the work piece in a liquid or gaseous medium.Quenching medium commonly used include water,5% brine,5%caustic in an aqueous solution,oil,polymer solutions,or gas(usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating(principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly.In selecting a quenching medium,it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated.Modifications of the term quenching include direct quenching,fog quenching,hot quenching,interrupted quenching, selective quenching,spray quenching,and time quenching.temperature as the axes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation.The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example,stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature(usually50°F to100°F or28℃to56℃)above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels,the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys,normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment,notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations.The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening,annealing,or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate.It is used primarily to soften metallic materials,but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be,but is not confined to,improvement of machinability,facilitation of cold work(known as in-process annealing),improvement of mechanical or electrical properties,or to increase dimensional stability.When applied solely to relive stresses,it commonly is called stress-relief annealing,synonymous with stress relieving.When the term“annealing”is applied to ferrous alloys without qualification,full annealing is applied.This is achieved by heating above the alloy’s transformation temperature,then applying aof heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel(T80)under equilibrium conditions contains，all austenite above723℃，whereas below，it is pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as the axes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation.The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example,stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature(usually50°F to100°F or28℃to56℃)above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels,the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys,normalizing and annealing are not synonymous.Stress relieving.Like tempering,stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons.For nonferrous metals,the temperature may vary from slightly above room temperature to several hundred degrees,depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming,rolling,machining or welding.The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses(this is a time-and temperature-dependent operation)to an acceptable level;this is followed by cooling at a relatively slow rate to avoid creation of new stresses.便利（被称为中间退火），机械或电气性能的提高，或增加尺寸稳定性。
金属的热处理外文翻译
附录 1英文及翻译Heat Treating of metalsHeatingFor this discussion, I will take you through the hardening process that I use on a high carbon steel blade, but first a few asides. When you place the steel in the fire it begins to gain heat. The steel will begin to give off visible color just above 900F it will continue to pick up color until it reaches a point where it seems to hang. It is still gaining heat, but it is undergoing an internal transformation from its cold structure into a metastable condition called austenite. This point at which it seems to hang is called decalescence and it represents the bottom of the critical temperature. It usually begins around 1335FIn carbon steel depending on the carbon content. Once it passes through this point, the crystal structure of the steel changes as the ferrite reacts with some of the carbide and begins to pool into austenite. As the temperature increases more of the austenite will begin to form in other places and continue until it reaches a point 10 or 15 degrees above the critical temperature where all of the ferrite should be consumed. At this point the steel should consist of austenite and undissolved carbides. The austenite grains start from a small nucleus and continue to grow until they impinge on other growing grains. The initial grain size is established at this point and if the excess carbide is in large quantities it will maintain this size with little increase, pinned by the carbide.You can see this transformation if you watch the steel carefully and bring the steel up slowly. The Japanese talked about watching the shadows on the blade and quenching when the shadows turned to liquid. If you take the blade out of the fire at this point and watch the colors drop, you will notice a point where the steel will brighten even as it is cooling. On a tapered cross section like a knife blade it will appear to travel up from the edge to the spine of the blade. This is callrecalescenceand represents the transformation from austenite back to pearlite. After I am done forging a blade, I cycle the blade just above critical and down to dark heat at least three times. I watch for these two points to establish critical in my mind and to set up a very fine grain pearlite structure in the steel.After reaching critical temperature, the steel should be fully austenized, but the carbides will continue to dissolve. It may be necessary to soak at temperature to fully dissolve all the carbides. In some steels it may be necessary to continue to raise the temperature for this to be accomplished especially in the presence of alloying elements that retard the transformation.Once the steel is above critical and austenite, it may be quenched and hardened. The structure of the steel can be established by carefully controlling the time it takes the steel drop from critical through the various temperature sensitive points.Transformations on CoolingAnnealing, normalizing, quenchingThe structure and hardness of the steel is established by the rate of cooling from the austenitic condition. If brought down slowly the steel will be annealed and soft. The structure will be mostly ferrite and cementite, carbides. This can be done in a temperature controlled furnace by dropping the temperature through a known rate over a set period of time dependent on the type of steel. Another method is to preheat a heavy bar of low carbon to the same temperature as critical for the steel and bury both of them together in vermiculite. It will slow the cooling rate down so that the blade will still be hot to the touch the next day. For most of the carbon steels this will be enough to anneal the piece.If allowed to air cool it will be normalized, a tougher condition comprised of fine pearlite and carbides. Blades can be prepared for heat treatment in either normalized or annealed states. Another treatment that is particularly effective for workability and for dimensional stability is called sphereodizing. With the steel in a normalizedcondition you reheat, usually in salt to inhibit oxidization, to a temperature just below lower critical, 1300F and hold for at least an hour. What occurs is that the carbides will begin to aglomulate or pool into larger more evenly spaced particles in a ferrite matrix. It makes handfinishing much easier.It is important to precondition your blades not only because it helps workability, but also to stress relieve the steel after forging. This will reduce chances of cracking and warping in the quench. It is helpful to think of the forging stage as the beginning of the heat treatment and to pay careful attention to the heats especially in the final forging. My last heats are always at critical. When the blade is finally shaped, I cycle the blade just above critical and down to almost black heat at least three times, cooling between by moving it back and forth in the air gently.HardeningYou have a lot of options when it comes to hardening carbon steel. Even the slightest change in alloy content can make a remarkable difference in the hardening characteristics of the steel, so I would again encourage you to study the steels you will be using.The transformation temperatures and times are described using a chart that shows the Ae1 line, the temperature at which austenite begins to form and the Msline, the temperature at which martensite starts to form from austenite.The time line at the bottom of the chart is in seconds and side bars give temperature. This is called an "S" curve chart and it is very useful in determining the quench speeds for each steel. The top curve of the "S" is known as the nose of the curve. When quenching from critical, the temperature of the steel must drop below the nose of the curve within a precise amount of time in order for the steel to harden to martensite. In this case, it must get below 900F in under five seconds to form martensite.MarquenchingIf the steel is quenched to below the Ms, martensite will be the predominate structure, however if the blade is quenched to a point slightly above the Ms point, say around 500F and held until it has stabilized at that temperature, the steel has the promise to form martensite, but will not set up until it drops below Ms. This is called marquenching and is commonly used because it is less stressful particularly in difficult cross sections like we encounter in knife blades. When the blade is removed from the quench it is still above the Ms point and has very unusual properties. It can be easily bent or straightened and isstill quite soft. As it cools however, it begins to setup martensite and will harden at room temperature. Again, you need to look at the chart for each steel you will be using because the Mf,or martensite finish point can be well below room temperature on some highly alloyed steels. These steels benefit from sub zero quenching because the colder temperatures are necessary to complete the austenite transformation and to reach the martensite finish. Care must be taken that the blade is not chilled by placing on a cold surface or even by being placed in a breeze or draft. The safest method is to allow it to cool in still air. The blade should be tempered after it has cooled to the point where it can be handled with bare hands.AustemperingIf the steel is quenched from Ae3, critical, to a point between the Ms and the nose of the curve, say 600F and held at temperature for a long time, the austenite will convert to banite. Banite is a much tougher structure than martensite and will maintain the hardness of the steel as tempered to that temperature. This process requires a salt bath and good controls, but makes an really tough spring and is being used by some makers on steels like 52100.QuenchantsThe method of controlling the speed of cooling is the quenchant. The quench rate is determined by how quickly the quenchant can remove the heat from the steel.When a piece of hot steel enters the quenchant the area surrounding the blade absorbs heat from the blade until it is heated itself.金属的热处理加热加热这种讨论,我将以高碳钢为例向你介绍其硬化过程.首先，你把钢铁放在火上加热时。
金属热处理外文文献及翻译
原文Heat treatment of metalThe generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.”Heating for the sole purpose of hot working (as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel (T80) under equilibrium conditions contains，all austenite above 723℃，whereas below，it is the pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as the axes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation. The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature (usually 50°F to 100°F or 28℃to 56℃) above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels, the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys, normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment, notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations. The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening, annealing, or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate. It is used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be, but is not confined to, improvement of machinability, facilitation of cold work (known as in-process annealing), improvement of mechanical or electrical properties, or to increase dimensional stability. When applied solely to relive stresses, it commonly is called stress-relief annealing, synonymous with stress relieving.When the term “annealing”is applied to ferrous alloys without qualification, full annealing is applied. This is achieved by heating above the alloy’s transformation temperature, then applying a cooling cycle which provides maximum softness. This cycle may vary widely, depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the work piece in a liquid or gaseous medium. Quenching medium commonly used include water, 5% brine, 5% caustic in an aqueous solution, oil, polymer solutions, or gas (usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating (principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly. In selecting a quenching medium, it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated. Modifications of the term quenching include direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.Tempering. In heat treating of ferrous alloys, tempering consists of reheating the austenitized and quench-hardened steel or iron to some preselected temperature that is below the lower transformation temperature (generally below 1300 ℃or 705 ℃). Tempering offers a means of obtaining various combinations of mechanical properties. Tempering temperatures used for hardened steels are often no higher than 300 ℃(150 ℃). The term “tempering”should not be confused with either process annealing or stress relieving. Even though time and temperature cycles for the three processes may be the same, the conditions of the materials being processed and the objectives may be different.Stress relieving. Like tempering, stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons. For nonferrous metals, the temperature may vary from slightly above room temperature to several hundred degrees, depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming, rolling, machining or welding. The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses (this is a time-and temperature-dependent operation) to an acceptable level; this is followed by cooling at a relatively slow rate to avoid creation of new stresses.The generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.”Heating for the sole purpose of hot working (as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel (T80) under equilibrium conditions contains，all austenite above 723℃，whereas below，it is pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as theaxes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation. The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature (usually 50°F to 100°F or 28℃to 56℃) above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels, the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys, normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment, notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations. The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening, annealing, or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate. It is used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be, but is not confined to, improvement of machinability, facilitation of cold work (known as in-process annealing), improvement of mechanical or electrical properties, or to increase dimensional stability. When applied solely to relive stresses, it commonly is called stress-relief annealing, synonymous with stress relieving.When the term “annealing”is applied to ferrous alloys without qualification, full annealing is applied. This is achieved by heating above the alloy’s transformation temperature, then applying acooling cycle which provides maximum softness. This cycle may vary widely, depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the workpiece in a liquid or gaseous medium. Quenching medium commonly used include water, 5% brine, 5% caustic in an aqueous solution, oil, polymer solutions, or gas (usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating (principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly. In selecting a quenching medium, it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated. Modifications of the term quenching include direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.Tempering. In heat treating of ferrous alloys, tempering consists of reheating the austenitized and quench-hardened steel or iron to some preselected temperature that is below the lower transformation temperature (generally below 1300 ℃or 705 ℃). Tempering offers a means of obtaining various combinations of mechanical properties. Tempering temperatures used for hardened steels are often no higher than 300 ℃(150 ℃). The term “tempering”should not be confused with either process annealing or stress relieving. Even though time and temperature cycles for the three processes may be the same, the conditions of the materials being processed and the objectives may be different.Stress relieving. Like tempering, stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons. For nonferrous metals, the temperature may vary from slightly above room temperature to several hundred degrees, depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming, rolling, machining or welding. The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses (this is a time-and temperature-dependent operation) to an acceptable level; this is followed by cooling at a relatively slow rate to avoid creation of new stresses.The generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.”Heating for the sole purpose of hot working (as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel (T80) under equilibrium conditions contains，all austenite above 723℃，whereas below，it is pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as the axes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation. The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature (usually 50°F to 100°F or 28℃to 56℃) above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels, the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys, normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment, notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations. The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening, annealing, or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate. It is used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be, but is not confined to, improvement of machinability, facilitation of cold work (known as in-process annealing), improvement of mechanical or electrical properties, or to increase dimensional stability. When applied solely to relive stresses, it commonly is called stress-relief annealing, synonymous with stress relieving.When the term “annealing”is applied to ferrous alloys without qualification, full annealing is applied. This is achieved by heating above the alloy’s transformation temperature, then applying a cooling cycle which provides maximum softness. This cycle may vary widely, depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the workpiece in a liquid or gaseous medium. Quenching medium commonly used include water, 5% brine, 5% caustic in an aqueous solution, oil, polymer solutions, or gas (usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating (principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly. In selecting a quenching medium, it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated. Modifications of the term quenching include direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.Tempering. In heat treating of ferrous alloys, tempering consists of reheating the austenitized and quench-hardened steel or iron to some preselected temperature that is below the lower transformation temperature (generally below 1300 ℃or 705 ℃). Tempering offers a means of obtaining various combinations of mechanical properties. Tempering temperatures used for hardened steels are often no higher than 300 oF (150 ℃). The term “tempering”should not be confused with either process annealing or stress relieving. Even though time and temperature cycles for the three processes may be the same, the conditions of the materials being processed and the objectives may be different.Stress relieving. Like tempering, stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons. For nonferrous metals, the temperature may vary from slightly above room temperature to several hundred degrees, depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming, rolling, machining or welding. The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses (this is a time-and temperature-dependent operation) to an acceptable level; this is followed by cooling at a relatively slow rate to avoid creation of new stresses.金属热处理对于热处理金属和金属合金通常接受的定义是“通过加热和冷却金属或合金的方式，以便获得特定的条件或属性。
金属材料及热处理中英文专业词汇表
《金属材料及热处理》课程中英文专业词汇表 （第二部分）刘国权辑录整理主要来源：全国材料科学名词委员会与中国材料研究学会组编的《材料科学名词》文稿；国家标准GB/T 7232-1999 “金属热处理工艺术语”等。
材料热处理基础术语热处理 heattreatment 采用适当的方式对材料或工件进行加热、保温和冷却以获得预期的组织结构与性能的工艺。
化学热处理 chemical heat treatment 将工件置于适当的活性介质中加热、保温，使一种或几种元素渗入它的表层，以改变其化学成分、组织和性能的热处理。
表面热处理 surface heat treatment 为改变工件表面的组织和性能，仅对其表面进行热处理的工艺。
局部热处理local heat treatment, partial heat treatment 仅对工件的某一部位或几个部位进行热处理的工艺。
预备热处理 conditioning heat treatment 为调整原始组织，以保证工件最终热处理或（和）切削加工质量，预先进行热处理的工艺。
真空热处理vacuum heat treatment, low pressure heat treatment在低于1×105Pa（通常是10-1～10-3Pa）的环境中进行的热处理工艺。
光亮热处理 bright heat treatment 工件在热处理过程中基本不氧化，表面保持光亮的热处理。
磁场热处理 magnetic heat treatment 为改善某些铁磁性材料的磁性能而在磁场中进行的热处理。
可控气氛热处理controlled atmosphere heat treatment 将工件置于可控制其化学特性的气相氛围中进行的热处理。
如无氧化、无脱碳、无增碳(氮)的热处理。
保护气氛热处理heat treatment in protective gases 在工件表面不氧化的气氛或惰性气体中进行的热处理。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
湖南工院毕业设计(论文)外文翻译外文题目Heat treatment of metal译文题目金属热处理系部机械工程系专业班级机械设计制造及其自动化机本0807班学生姓名曹然指导教师陈平、邓兴贵完成时间2012-05原文Heat treatment of metalThe generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.”Heating for the sole purpose of hot working (as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel (T80) under equilibrium conditions contains，all austenite above 723℃，whereas below，it is the pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as the axes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation. The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature (usually 50°F to 100°F or 28℃to 56℃) above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels, the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys, normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment, notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations. The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening, annealing, or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate. It is used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be, but is not confined to, improvement of machinability, facilitation of cold work (known as in-process annealing), improvement of mechanical or electrical properties, or to increase dimensional stability. When applied solely to relive stresses, it commonly is called stress-relief annealing, synonymous with stress relieving.When the term “annealing”is applied to ferrous alloys without qualification, full annealing is applied. This is achieved by heating above the alloy’s transformation temperature, then applying a cooling cycle which provides maximum softness. This cycle may vary widely, depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the work piece in a liquid or gaseous medium. Quenching medium commonly used include water, 5% brine, 5% caustic in an aqueous solution, oil, polymer solutions, or gas (usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating (principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly. In selecting a quenching medium, it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated. Modifications of the term quenching include direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.Tempering. In heat treating of ferrous alloys, tempering consists of reheating the austenitized and quench-hardened steel or iron to some preselected temperature that is below the lower transformation temperature (generally below 1300 ℃or 705 ℃). Tempering offers a means of obtaining various combinations of mechanical properties. Tempering temperatures used for hardened steels are often no higher than 300 ℃(150 ℃). The term “tempering”should not be confused with either process annealing or stress relieving. Even though time and temperature cycles for the three processes may be the same, the conditions of the materials being processed and the objectives may be different.Stress relieving. Like tempering, stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons. For nonferrous metals, the temperature may vary from slightly above room temperature to several hundred degrees, depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming, rolling, machining or welding. The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses (this is a time-and temperature-dependent operation) to an acceptable level; this is followed by cooling at a relatively slow rate to avoid creation of new stresses.The generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.”Heating for the sole purpose of hot working (as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel (T80) under equilibrium conditions contains，all austenite above 723℃，whereas below，it is pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as theaxes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation. The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature (usually 50°F to 100°F or 28℃to 56℃) above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels, the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys, normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment, notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations. The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening, annealing, or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate. It is used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be, but is not confined to, improvement of machinability, facilitation of cold work (known as in-process annealing), improvement of mechanical or electrical properties, or to increase dimensional stability. When applied solely to relive stresses, it commonly is called stress-relief annealing, synonymous with stress relieving.When the term “annealing”is applied to ferrous alloys without qualification, full annealing is applied. This is achieved by heating above the alloy’s transformation temperature, then applying acooling cycle which provides maximum softness. This cycle may vary widely, depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the workpiece in a liquid or gaseous medium. Quenching medium commonly used include water, 5% brine, 5% caustic in an aqueous solution, oil, polymer solutions, or gas (usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating (principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly. In selecting a quenching medium, it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated. Modifications of the term quenching include direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.Tempering. In heat treating of ferrous alloys, tempering consists of reheating the austenitized and quench-hardened steel or iron to some preselected temperature that is below the lower transformation temperature (generally below 1300 ℃or 705 ℃). Tempering offers a means of obtaining various combinations of mechanical properties. Tempering temperatures used for hardened steels are often no higher than 300 ℃(150 ℃). The term “tempering”should not be confused with either process annealing or stress relieving. Even though time and temperature cycles for the three processes may be the same, the conditions of the materials being processed and the objectives may be different.Stress relieving. Like tempering, stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons. For nonferrous metals, the temperature may vary from slightly above room temperature to several hundred degrees, depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming, rolling, machining or welding. The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses (this is a time-and temperature-dependent operation) to an acceptable level; this is followed by cooling at a relatively slow rate to avoid creation of new stresses.The generally accepted definition for heat treating metals and metal alloys is “heating and cooling a solid metal or alloy in a way so as to obtain specific conditions or properties.”Heating for the sole purpose of hot working (as in forging operations) is excluded from this definition．Likewise，the types of heat treatment that are sometimes used for products such as glass or plastics are also excluded from coverage by this definition．Transformation CurvesThe basis for heat treatment is the time-temperature-transformation curves or TTT curves where，in a single diagram all the three parameters are plotted．Because of the shape of the curves，they are also sometimes called C-curves or S-curves．To plot TTT curves，the particular steel is held at a given temperature and the structure is examined at predetermined intervals to record the amount of transformation taken place．It is known that the eutectoid steel (T80) under equilibrium conditions contains，all austenite above 723℃，whereas below，it is pearlite．To form pearlite，the carbon atoms should diffuse to form cementite．The diffusion being a rate process，would require sufficient time for complete transformation of austenite to pearlite．From different samples，it is possible to note the amount of the transformation taking place at any temperature．These points are then plotted on a graph with time and temperature as the axes．Through these points，transformation curves can be plotted as shown in Fig.1 for eutectoid steel．The curve at extreme left represents the time required for the transformation of austenite to pearlite to start at any given temperature．Similarly，the curve at extreme right represents the time required for completing the transformation．Between the two curves are the points representing partial transformation. The horizontal lines Ms and Mf represent the start and finish of martensitic transformation.Classification of Heat Treating ProcessesIn some instances，heat treatment procedures are clear-cut in terms of technique and application．whereas in other instances，descriptions or simple explanations are insufficient because the same technique frequently may be used to obtain different objectives．For example, stress relieving and tempering are often accomplished with the same equipment and by use of identical time and temperature cycles．The objectives，however，are different for the two processes．The following descriptions of the principal heat treating processes are generally arranged according to their interrelationships．Normalizing consists of heating a ferrous alloy to a suitable temperature (usually 50°F to 100°F or 28℃to 56℃) above its specific upper transformation temperature．This is followed by cooling in still air to at least some temperature well below its transformation temperature range．For low-carbon steels, the resulting structure and properties are the same as those achieved by full annealing；for most ferrous alloys, normalizing and annealing are not synonymous.Normalizing usually is used as a conditioning treatment, notably for refining the grains of steels that have been subjected to high temperatures for forging or other hot working operations. The normalizing process usually is succeeded by another heat treating operation such as austenitizing for hardening, annealing, or tempering.Annealing is a generic term denoting a heat treatment that consists of heating to and holding at a suitable temperature followed by cooling at a suitable rate. It is used primarily to soften metallic materials, but also to simultaneously produce desired changes in other properties or in microstructure. The purpose of such changes may be, but is not confined to, improvement of machinability, facilitation of cold work (known as in-process annealing), improvement of mechanical or electrical properties, or to increase dimensional stability. When applied solely to relive stresses, it commonly is called stress-relief annealing, synonymous with stress relieving.When the term “annealing”is applied to ferrous alloys without qualification, full annealing is applied. This is achieved by heating above the alloy’s transformation temperature, then applying a cooling cycle which provides maximum softness. This cycle may vary widely, depending on composition and characteristics of the specific alloy.Quenching is a rapid cooling of a steel or alloy from the austenitizing temperature by immersing the workpiece in a liquid or gaseous medium. Quenching medium commonly used include water, 5% brine, 5% caustic in an aqueous solution, oil, polymer solutions, or gas (usually air or nitrogen).Selection of a quenching medium depends largely on the hardenability of material and the mass of the material being treating (principally section thickness).The cooling capabilities of the above-listed quenching media vary greatly. In selecting a quenching medium, it is best to avoid a solution that has more cooling power than is needed to achieve the results, thus minimizing the possibility of cracking and warp of the parts being treated. Modifications of the term quenching include direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.Tempering. In heat treating of ferrous alloys, tempering consists of reheating the austenitized and quench-hardened steel or iron to some preselected temperature that is below the lower transformation temperature (generally below 1300 ℃or 705 ℃). Tempering offers a means of obtaining various combinations of mechanical properties. Tempering temperatures used for hardened steels are often no higher than 300 oF (150 ℃). The term “tempering”should not be confused with either process annealing or stress relieving. Even though time and temperature cycles for the three processes may be the same, the conditions of the materials being processed and the objectives may be different.Stress relieving. Like tempering, stress relieving is always done by heating to some temperature below the lower transformation temperature for steels and irons. For nonferrous metals, the temperature may vary from slightly above room temperature to several hundred degrees, depending on the alloy and the amount of stress relief that is desired.The primary purpose of stress relieving is to relieve stresses that have been imparted to the workpiece from such processes as forming, rolling, machining or welding. The usual procedure is to heat workpiece to the pre-established temperature long enough to reduce the residual stresses (this is a time-and temperature-dependent operation) to an acceptable level; this is followed by cooling at a relatively slow rate to avoid creation of new stresses.金属热处理对于热处理金属和金属合金普遍接受的定义是“加热和冷却的方式了坚实的金属或合金，以获得特定条件或属性为唯一目的。