Abstract In order to reveal the behaviors of two kinds of martensites (e-M and α′-M) transformation during TRIP and reversion process and to separate transformation textures from rolling textures during the TRIP process, the phase transformation and texture evolution during cold rolling and the subsequent heating in high manganese TRIP steel were investigated by time-of-flight neutron diffraction measurement. The results show that the TRIP process occurred mainly at the rolling reductions ranging from 0% to 60%. The transformation of γ → e-Μ and e-Μ → α′-Μ didn't occur synchronously and the transformation of γ → e-Μ was easier and occurred earlier. The cube-oriented γ grains transformed to martensite most easily showing an orientation dependence and the γ grains with other orientations tend to form preferentially the {100} orientation in α′-Μ phase demonstrating a strong variant selection during the TRIP process below the 60% rolling reduction. The {113}〈110〉 texture of α′-Μ rotated toward a more stable orientation {112}〈110〉 with increasing reduction and a shift of texture components from rotated cube and α-fibre to the γ-fibre occurred at higher rolling reduction. The e-M texture was characterized by a constant {0001} peaks 20°-tilted toward RD at any reduction related with a high Schmid factor for basal slip. For the 60% rolled sample, the reversion of e-Μ and α′-Μ to γ-phase occurred at temperatures ranging from 300 °C to 500 °C and 500 °C to 700 °C, respectively. During heating, the deformed α′-M did not change its texture until decomposition and swallowing-up by austenite, and the retained and newly nucleated γ grains inherited their initial Goss and brass orientations until their recrystallization and replacing by Goss texture. This weak Goss texture remained during further heating to 900 °C and subsequent cooling. In addition, the transformation of both kinds of thermally-induced martensites during cooling can only occurred below 200 °C.

中文翻译：

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高锰TRIP钢中马氏体转变、织构演变和马氏体回复的原位中子衍射研究

摘要 为了揭示TRIP和回复过程中两种马氏体（eM和α′-M）相变行为，分离TRIP过程中的相变织构和轧制织构，研究冷轧过程中的相变和织构演变以及通过飞行时间中子衍射测量研究了高锰 TRIP 钢中的后续加热。结果表明，TRIP 过程主要发生在轧制压下量为 0% 到 60% 的范围内。γ → e-M 和e-M → α'-M 的转化不是同步发生的，γ → e-M 的转化更容易并且发生得更早。立方体取向的 γ 晶粒最容易转变为马氏体，显示出取向依赖性，而具有其他取向的 γ 晶粒倾向于在 α'-M 相中优先形成 {100} 取向，表明在低于 60% 的 TRIP 过程中具有很强的变体选择轧制减少。α'-M 的 {113}<110> 织构向更稳定的方向旋转 {112}〈110> 随着减少的增加和织构分量从旋转立方体和 α-纤维向 γ-纤维的转变发生在更高的滚动减少。eM 纹理的特征在于，在与高施密德因子相关的任何降低时，向 RD 倾斜 20° 的恒定 {0001} 峰。对于 60% 的轧制样品，e-M 和 α'-M 转变为 γ 相分别发生在 300°C 至 500°C 和 500°C 至 700°C 的温度范围内。在加热过程中，变形后的α′-M直到被奥氏体分解和吞噬才改变其织构，而保留的和新成核的γ晶粒继承了它们最初的Goss和黄铜取向，直到它们再结晶并被Goss织构取代。在进一步加热到 900 °C 和随后的冷却过程中，这种弱的戈斯质地仍然存在。此外，两种热致马氏体在冷却过程中的转变只能在 200 °C 以下发生。