Structure and properties control and dynamic constitutive model of TRIP980 steel
A transformation induced plasticity(TRIP)steel was designed,and the effects of the bainite isothermal temperature on the mechanical properties and microstructure were studied.According to the optimal process,the dynamic mechanical properties with the strain rate of 10-4-103 s-1 were studied,and the dynamic constitutive mathematical model was constructed and modified.The results show that when the bainite isothermal temperature is 380 ℃,the experimental steel has the best static mechanical properties(strain rate of 10-3 s-1),the yield strength reaches 705 MPa,the tensile strength reaches 1005 MPa,the elongation is 16％and the strength plastic product reaches 1.6 GPa·％.The change of strain rate has a significant effect on the hardening behavior and TRIP effect of the experi-mental steel.When the strain rate reaches 103 s-1,the yield strength and tensile strength reach 815 and 1145 MPa,increasing by 12.4％and 13.9％,respectively.The dynamic constitutive mathematical model with A4 coefficient correction shows that the average values of R and eAARE reach 0.9895 and 27.5％,respectively,indicating that the model has a relatively high prediction accuracy.
TRIP steelmicrostructureproperty controldynamic constitutive model
万方数据
维普
