利用Gleeble-1500热模拟试验机,研究了热变形参数对低碳微合金钢α→γ逆相变再结晶的影响及其晶粒细化的机制。结果表明,试验钢中非平衡态组织马氏体在再加热过程中,原奥氏体晶粒发生了逆相变再结晶,并随变形温度的降低,再加热淬火后的奥氏体晶粒逐渐细化;在部分再结晶区变形得到的混晶组织,可以通过逆相变再结晶得到消除;随变形量的增加,再加热淬火后的奥氏体晶粒逐渐细化。 Using Gleeble-1500 thermal simulation testing machine, the effect of thermal deformation parameters on α → γ reverse transformation recrystallization and the mechanism of grain refinement were studied. The results show that during the reheating process, the original austenite grains undergo reverse phase transformation and recrystallization in the non-equilibrium microstructure martensites. With the decrease of the deformation temperature, the austenite grains after quenching And gradually refined. The mixed crystal structure obtained in the partial recrystallization zone can be eliminated by reverse phase recrystallization. With the increase of deformation, the austenite grains after reheating and quenching gradually refine.