Microstructure evolution of ultra-high-strength twinning-induced plasticity (TWIP) steel under dynamic loading
Qi‑hang Pang1,2, Mei Xu1,2,3, Zhen‑li Mi4, Juan Cui5, Jing Guo1,2
1 School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China 2 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China 3 State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel Group Co., Ltd., Taiyuan 030003, Shanxi, China 4 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China 5 Beijing Jianlong Heavy Industry Group Co., Ltd., Beijing 100070, China
Microstructure evolution of ultra-high-strength twinning-induced plasticity (TWIP) steel under dynamic loading
Qi‑hang Pang1,2, Mei Xu1,2,3, Zhen‑li Mi4, Juan Cui5, Jing Guo1,2
1 School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China 2 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China 3 State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel Group Co., Ltd., Taiyuan 030003, Shanxi, China 4 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China 5 Beijing Jianlong Heavy Industry Group Co., Ltd., Beijing 100070, China
摘要 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.
Abstract：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.
Qi‑hang Pang,Mei Xu,Zhen‑li Mi, et al. Microstructure evolution of ultra-high-strength twinning-induced plasticity (TWIP) steel under dynamic loading[J]. Journal of Iron and Steel Research International, 2021, 28(1): 66-75.
2021, Vol. 28 
