%A Qi‑hang Pang, Mei Xu, Zhen‑li Mi, Juan Cui, Jing Guo %T Microstructure evolution of ultra-high-strength twinning-induced plasticity (TWIP) steel under dynamic loading %0 Journal Article %D 2021 %J 钢铁研究学报(英文版) %R 10.1007/s42243-020-00457-2 %P 66-75 %V 28 %N 1 %U {http://www.chinamet.cn/Jweb_gtyjxb_en/CN/abstract/article_152506.shtml} %8 2021-01-25 %X To prepare ultra-high-yield strength twinning-induced plasticity (TWIP) steel and reveal its work hardening mechanism at different strain rates from the microcosmic range, the microstructure evolution mechanism of Fe–20Mn–0.6C TWIP steel was investigated at strain rates of 10-4–103 s-1 using a high-speed tensile testing machine and a transmission electron microscope. The results show that the strain rate and deformation had a significant effect on the twin morphology of TWIP steels. At a strain rate of 102 s-1, secondary deformation twins were developed, which intersected with the initial deformation twins and increased the resistance of dislocation movement, as well as the plasticity. TWIP steel at a strain rate of 102 s-1 had a higher twin formation speed than that at 100 s-1. At the same amount of deformation, the twin boundary fraction was higher and increased linearly at a strain rate of 102 s-1, while the rule of twin growth at 100 s-1 was conformed to S-curve change of DoseResp model.