The hot deformation behavior of an alumina-forming austenitic (AFA) stainless steel was investigated on a Gleeble-3500 simulator. Moreover, the critical dynamic recrystallization model was established, and the critical stress was determined. Microstructural characterization was analyzed using electron backscattered diffraction (EBSD) and transmission electron microscope (TEM). The microstructure evolution showed that the degree of dynamic recrystallization (DRX) and the content of high-angle grain boundaries increased significantly with the increasing temperature and the decreasing strain rate. For recrystallization mechanisms, the bulging mechanism was found dominating, while the sub-grain rotation mechanism played an assisting role. Furthermore, discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) coexisted during the hot deformation.

在Gleeble-3500模拟器上研究了形成氧化铝的奥氏体（AFA）不锈钢的热变形行为。此外，建立了临界动态再结晶模型，并确定了临界应力。使用电子背散射衍射（EBSD）和透射电子显微镜（TEM）分析了微结构特征。显微组织演变表明，随着温度的升高和应变速率的降低，动态再结晶度（DRX）和高角度晶界含量显着增加。对于重结晶机理，发现膨胀机理起主导作用，而亚晶粒旋转机理起辅助作用。此外，