The thermal and mechanical stabilities of retained austenite in aluminum-containing medium-Mn 0.16C–4.7Mn–1.6Al–0.2Si sheet steel were investigated. The strain-induced martensitic transformation in Mn TRIP steel was studied at different temperatures. Static tensile tests were carried out at the temperature ranging from − 60 to 200 °C. The tests allowed to study the influence of the temperature on austenite-to-martensite transformation kinetics. The interrupted tensile tests and corresponding X-ray measurements of retained austenite amount were performed to determine the mechanical stability of retained austenite using the Sugimoto model. The microstructure changes were investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. Observed results reflected the effects of deformation temperature on the mechanical stability of retained austenite and the corresponding response of this phase to martensitic transformation. It was found that an increase in the deformation temperature resulted in the reduced intensity of the TRIP effect due to the higher mechanical stability of retained austenite. At the highest deformation temperature (200 °C), the evidence of thermally activated processes affecting the mechanical behavior was identified.

研究了含铝介质Mn 0.16C–4.7Mn–1.6Al–0.2Si钢板中残余奥氏体的热稳定性和机械稳定性。研究了不同温度下Mn TRIP钢的应变诱发马氏体相变。静态拉伸试验在− 60至200°C的温度范围内进行。该测试允许研究温度对奥氏体-马氏体转变动力学的影响。使用Sugimoto模型进行了中断的拉伸试验和相应的残余奥氏体X射线测量，以确定残余奥氏体的机械稳定性。使用扫描电子显微镜（SEM），电子反向散射衍射（EBSD），X射线衍射（XRD）和透射电子显微镜（TEM）技术研究了微观结构的变化。观察到的结果反映了变形温度对残余奥氏体力学稳定性的影响以及该相对马氏体相变的相应响应。已经发现，由于残余奥氏体的较高的机械稳定性，变形温度的升高导致TRIP效应的强度降低。在最高变形温度（200°C）下，可以确定热活化过程影响机械行为的证据。已经发现，由于残余奥氏体的较高的机械稳定性，变形温度的升高导致TRIP效应的强度降低。在最高变形温度（200°C）下，可以确定热活化过程影响机械行为的证据。已经发现，由于残余奥氏体的较高的机械稳定性，变形温度的升高导致TRIP效应的强度降低。在最高变形温度（200°C）下，可以确定热活化过程影响机械行为的证据。