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.

为了制备超高屈服强度孪生诱导塑性（TWIP）钢并揭示其在微观范围内不同应变速率下的工作硬化机制，研究了Fe–20Mn–0.6C TWIP钢在应变速率下的组织演变机理。 10 ^-4 –10 ³  s ^-1使用高速拉伸试验机和透射电子显微镜。结果表明，应变速率和变形对TWIP钢的孪生形态有显着影响。应变率为10 ²  s ^-1，发展了二次变形双胞胎，与初始变形双胞胎相交，并增加了位错运动的阻力以及可塑性。TWIP钢在10 ²  s ^-1的应变速率下具有比10 ⁰  s ^-1更高的孪晶形成速度。在相同的变形量下，孪晶边界分数更高，并且以10 ²  s ^-1的应变速率线性增加，而在10 ⁰  s ^-1的孪晶生长规律符合DoseResp模型的S曲线变化。