The Strengthening Mechanism Research of Automobile-Used High Strength Steel

Contrast experiments were performed to compare the mechanical properties and shaping properties of the BH340 and BIF340 with those of domestic IF Steel St13,St14,and to analyze the strengthening mechanisms of BH340 and BIF340.The conclusions indicate the ability of bake hardening of BH340 is better than that of BIF340?St13?St14,and the yield strength of BH340 is improved distinctly after bake hardening where the existence of P?Si and Mn has an effect of solution strengthening and baking hardening can't make grain refined.The strengthening mechanisms of BIF340 involve grain refining stengthening,solid strengthening and precipitation strengthening.