汽车零部件用微合金非调质钢的开发及应用

Presentation Overview
• Opportunities for use of Microalloyed Steels in Automobiles
• Reduce manufacturing costs • Balance properties and performance • Tailor materials for specific application • Elements of interest Ti, Nb, V, N, C, … Al … and
Requirements for New Microalloyed Bar and Forging Steels
Alloying, Processing and Product Developments
• Higher Strength … with …
• Excellent Mechanical Properties • Formability, Toughness, Fatigue Resistance, Machinability ……..
Microstructural Classes of Microalloyed Steels
• Ferrite-Pearlite Steels – Direct Cooled • Strengthened by: • Pearlite volume fraction • Ferrite grain size and substructure • Precipitation strengthening of ferrite (e.g. V and Nb)
Automotive Materials
Etc. 7%
Ultra Light Steel Auto Suspension, AISI (2001), www.autosteel.org
Example: Trends in Engine Design
• New environmental legislation – continued reductions in allowable emissions
their T-dependent solubilities
• Presentation based on Selected Examples
• Automotive Springs • Forgings for Gears • Thermomechanical Processing • Transmission Components
• Growth in use in the US – 1990’s • Ferrite-pearlite steels • Non-traditional bainitic steels with retained austenite
• With improved processing control and understanding of microalloying fundamentals, use continues to expand.
Suspension components
Gears, axles, Transmission shafts, hubs components
???Future Applications???
http://www.khulsey.com - © Kevin Hulsey Illustration, Inc. (2005)
• Product Benefits
• More efficient vehicle designs • Higher torque-capacity components • Higher operating stresses
• Safer vehicles • Improved crashworthiness
汽车零部件用微合金非 调质钢的开发及应用
2020/9/14
Microalloy Steel Applications
Engine Components: Crank shafts Connecting rods
Sheet steels for outer body and structural components
Example: Trends in Engine Design
• Lighter weight powerplants for improved fuel economy
• Require higher strength materials
• Microalloyed bar steels for crankshafts • Increased stiffness (compared to cast iron) • Better fatigue resistance • Reduced component weight • Allow smaller and lighter flywheels and clutch systems
• Heat Treate百度文库 Steels • Through hardened (martensitic or bainitic) • Induction hardened surfaces
• Diesel: Increased injection pressures • Gasoline: Increased use of turbo and/or compressors
European Data
Reduce Size
kW/L
C. Lemaître, AIST Bar Conf., Winter Park, Colorado (2006)
AISI Report – 2004 www.autosteel.org
Historical: Use of Microalloyed Forging Steels for Automotive Components
• Initial applications in Europe – 1980’s • Based on direct-cooled ferrite-pearlite steels