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研究了超快速冷却、层流冷却两种热轧冷却方式以及冷轧变形量对汽车钢板组织和力学性能的影响。结果表明:超快速冷却和层流冷却下钢板经不同变形量冷轧和退火处理后均发生了再结晶,组织呈细小等轴状晶粒。随冷轧变形量增加,超快速冷却和层流冷却钢板屈服强度和塑性应变比逐渐增大,加工硬化指数逐渐减小。超快速冷却方式较合理。冷轧变形量应控制小于80%。热轧板超快速冷却终止温度应选择800℃,冷轧变形量在60%~70%之间,冷轧后退火温度选择750℃。
The effects of ultra-rapid cooling and laminar cooling on the microstructures and mechanical properties of automotive steel sheets were investigated. The results show that both super-rapid cooling and laminar-flow cooling recrystallize the steel plate after being cold-rolled and annealed at different deformations, with fine equiaxed grains. With the increase of cold rolling deformation, the yield strength and plastic strain ratio of ultra-rapid cooling and laminar cooling steel plate increase gradually, and the work hardening index decreases gradually. Ultra-fast cooling method is more reasonable. Cold rolling deformation should be controlled less than 80%. The final quenching temperature of hot-rolled plates should be 800 ℃, the cold-rolling deformation should be between 60% and 70%, and the annealing temperature should be 750 ℃ after cold-rolling.