中文摘要：

在变形温度为1223~1423 K及应变速率为0.01~10 s-1的条件下,利用MMS-300热模拟试验机开展单道次压缩变形实验,结合SEM-EBSD和TEM等观察分析技术,研究了一种高锰奥氏体孪晶诱发塑性（TWIP）钢的高温热变形及再结晶行为,对其动态再结晶过程中的组织演变规律及其与应力-应变曲线的相关性进行了分析和表征.结果表明,该高锰奥氏体TWIP钢的热变形行为对应变速率较敏感;当应变速率低于0.1 s-1时,热变形过程中发生动态再结晶;当应变速率高于1 s-1时,发生动态回复.通过回归计算建立了该高锰奥氏体TWIP钢的热变形本构方程,分析认为动态再结晶过程中的组织演变规律与其应力-应变曲线密切相关.随着应变量的增加,晶界迁移诱导再结晶形核;形变量进一步增加,产生大量亚晶界;相邻亚晶界上的位错攀移和滑移等运动使晶界合并,导致再结晶晶粒形成.

英文摘要：

Stainless steel is widely used in both industrial production and daily-life due to its anti-corrosion behavior. In view of the shortage in Cr and Ni resources, there has been an increasing interest in developing low- cost stainless steels for several decades. Under the frame of replacing Ni and Cr with Mn and A1, respectively, a recent study indicates that Fe-Mn-A1-C austenitic twinning-induced plasticity （TWIP） steel possesses good compre-hensive properties and excellent resistance to oxidation that make it potential in partially replacing conventional austenitic stainless steels. As a viable alternative to low-cost austenitic stainless steel, a new alloy system of high- manganese low-chromium nitrogen-containing TWIP steel was developed in this study. Considering its corrosion resistance, the alloy is not completely free of chromium, yet the Cr content is relatively low. Nitrogen is added, because it is a strong austenite stabilizer that can reduce the tendency to form ferrite and deformation-induced a＇- and ε-martensites, thereby reducing the amount of nickel required in austenitic stainless steel. Furthermore, nitrogen is beneficial for pitting corrosion resistance. In this study, hot deformation and recrystallization behaviors of this high manganese austenitic TWIP steel were investigated by single-pass compression tests on MMS-300 thermo-mechan- ical simulator at temperature ranging from 1223 K to 1423 K and strain rate ranging from 0.01s^-1 to 10 s^-1 Micro-structure evolution during dynamic recrystallization and the correlation of microstructure change to the stress-strain response were further analyzed by using TEM and SEM equipped with EBSD. The results show that the hot defor- mation behavior of this steel is more sensitive to deformation rate. Dynamic recrystallization occurs during hot de- formation when deformation rate is lower than 0.1 s^-1, while dynamic recovery takes place at deformation rate high- er than 1 s^-1. The hot deformation constitutive equation of the high manganese austenitic