Investigation of Deformation Behavior of TWIP Steel Using Crystal Plasticity Coupling Temperature Effect

doi:10.3901/JME.2022.20.283

Abstract

Abstract: In order to investigate the deformation mechanism of TWIP steel at high temperature，the crystal plastic constitutive model was established by considering the effect of temperature on slip and twinning of TWIP steel，and the flow law and hardening law of considering temperature effect were proposed. The crystal plastic finite element model of TWIP steel during hot deformation was established by in-situ SEM high temperature tensile tests under 500 ℃ and 750 ℃. The stress-strain curves，strain hardening rates and twin volume fraction at different temperatures obtained by simulation were in agreement with the experimental results，which verified the correctness of the model. Based on the model，the effect of temperature on the slip，twinning and strain hardening of TWIP steel during plastic deformation was researched，the results show that the slip resistance，twinning resistance and strain hardening rate decrease unevenly with the increase of temperature，and the elongation after breaking decreases abnormally，from 53.4% at 25 ℃ to 16.5% at 750 ℃. With the increase of temperature，the twinning is restrained while the slip process is less affected by temperature，which shows the plastic deformation mechanism dominated by slip.

Key words: TWIP steel, plastic deformation, crystal plasticity, temperature effect, in-situ SEM high temperature tensile

CLC Number:

TG142

CAI Wang, WANG Chunhui, SUN Chaoyang, MA Jinyao, LI Yuemin, JIANG Jun, ZHANG Yuefei. Investigation of Deformation Behavior of TWIP Steel Using Crystal Plasticity Coupling Temperature Effect[J]. Journal of Mechanical Engineering, 2022, 58(20): 283-293.

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