Hot Deformation Behavior and Constitutive Model of Advanced Ultra-high Strength Hot Stamping Steel
ZHANG Shi-qi1,2, FENG Ding1,2, ZHANG Yue3, HONG Ji-yao4
1. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan 430100, China;
2. School of Mechanical Engineering, Yangtze University, Jingzhou 434023, Hubei, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
4. State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel), Shanghai 201900, China
Abstract：The hot deformation behavior of the advanced ultra-high strength hot stamping steel 22MnB5Nb was studied through the isothermal uniaxial tensile tests at 650-950℃ and strain rates of 0.1, 1.0s-1 and 10s-1 by Gleeble 1500D system. The conventional Arrhenius-type hyperbolic sine equation, the Arrhenius-type model considering the material constant strain compensation and the new Arrhenius-type model based on Quasi-Newton BFGS algorithm were established to describe the high-temperature deformation behavior of 22MnB5Nb. The results indicate that 22MnB5Nb steel shows typical work hardening and dynamic recovery softening behavior during hot tensile. And the strain rate and deformation temperature have significant effects on the flow stress. The peak flow stress values predicted by these models are highly consistent with the experimental values, and the Quasi-Newton BFGS algorithm can solve all the material parameters in one time and it is simpler in calculation process and has the highest accurate(R=0.99578, Re=11.03MPa, E=2.48%), while, the Arrhenius-type model considering material constant strain compensation with lower accuracy, but can directly predicts not only the flow stress curve under different deformation conditions, but also the work hardening behavior, the dynamic recovery behavior and the strain rate strengthening effect of the experimental steel during the deformation process.
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