运用高温金相和TEM方法,对超高强度钢300M的奥氏体相变再结晶过程和新晶界进行了定位观察。实验结果表明:在高温金相下,奥氏体相变再结晶晶界横穿过板条组织,而在TEM下为高密度位错缠结条带。据试验结果,提出了奥氏体相变再结晶位错形核机制。 Using high temperature metallography and TEM method, the austenite transformation recrystallization process and new grain boundary of 300M ultrahigh strength steel were observed. The experimental results show that the recrystallized grain boundaries of austenite transform transversely across the laths and the high-density dislocation entangled bands under the TEM. According to the experimental results, the dislocation nucleation mechanism of austenite phase transformation recrystallization was proposed.