The deformation mechanism of Fe-20Mn-0.6C twinning-induced plasticity (TWIP) steel was studied with respect to different strain rates ranging from 10⁻⁴ to 10³ s⁻¹. Moreover, the microstructure of the ultra-high strength TWIP steel at each strain rate was characterized by transmission electron microscopy (TEM). The TWIP steel exhibits three distinct strain hardening stages with increasing true strain. In stage II, dσ/dε shows a plateau at the strain rates of 10⁻³ to 10⁻¹ s⁻¹, while dσ/dε continuously decreases in the other stages with increasing strain rate. The deformation mechanism of TWIP steel under the high strain rate was a process in which the deformation twin and the dislocation slip promoted and restricted each other. When the strain rate is higher than 10² s⁻¹, the increase in the adiabatic heating temperature (approximately 143°C) suppresses the secondary twinning and enhances the softening effect.

研究了Fe-20Mn-0.6C孪晶诱导塑性（TWIP）钢在10 ^-4到10 ³ s ^-1范围内的不同应变速率下的变形机理。此外，通过透射电子显微镜（TEM）表征了超高强度TWIP钢在每个应变速率下的组织。TWIP钢表现出三个不同的应变硬化阶段，同时增加了真实应变。在阶段II，d σ / d ε示出了在10的应变速率的高原^-3至10 ^-1小号^-1，而d σ / d ε在其他阶段随着应变率的增加而连续降低。TWIP钢在高应变速率下的变形机理是变形双胞胎和位错滑移相互促进和约束的过程。当应变率高于10 ² s ^-1时，绝热加热温度（约143℃）的升高抑制了二次孪晶并增强了软化效果。