Original austenite grain size and stacking fault energy (SFE) of a high-Mn transformation-induced plasticity (TRIP) steel were varied by annealing at different temperatures. The microstructural evolution during cooling and tensile deformation were investigated to explain the work hardening behavior. The study suggested that the amount of ε-martensite was increased with annealing temperature. When SFE was greater than 13.3 mJ/m², twin may form in austenite on cooling; and ε-martensite cannot be thermally induced in austenite once its SFE was higher than 20.6 mJ/m². Work hardening behavior of the steel annealed at different temperatures could be divided into two stages using Hollomon analysis. The grain refinement strengthening and deformation induced γ → ε transformation rendered 800 °C annealed sample to have the largest work hardening exponent in Stage-I, in this case ultimate tensile strength was also highest. In Stage-II, significant deformation-induced ε → α′ transformation in samples annealed at high temperatures resulted in greater improvement of work hardening exponent. The elongation of the steel was also improved with annealing temperature because local stress concentration was effectively released by ε → α′ transformation.

通过在不同温度下进行退火，可以改变高锰钢转变诱导塑性（TRIP）钢的原始奥氏体晶粒尺寸和堆垛层错能（SFE）。研究了冷却和拉伸变形过程中的微观组织演变，以解释加工硬化行为。研究表明，ε-马氏体的含量随着退火温度的增加而增加。当SFE大于13.3 mJ / m ^2时，冷却时奥氏体中可能会形成孪晶。ε-马氏体的SFE高于20.6 mJ / m ^2时就不能在奥氏体中热诱导。使用Hollomon分析，可以将在不同温度下退火的钢的加工硬化行为分为两个阶段。晶粒细化强化和形变诱导的γ→ε相变使800°C退火的样品在阶段I中具有最大的加工硬化指数，在这种情况下，极限抗拉强度也最高。在第二阶段中，在高温下退火的样品中明显的由变形引起的ε→α'转变导致加工硬化指数得到更大的改善。钢的伸长率也随着退火温度的提高而提高，因为通过ε→α'相变可有效释放局部应力集中。