以CSP热轧QZ35钢为对象，研究了发生动态再结晶条件，对再结晶与混晶进行判定。结果表明：根据真应力一真应变曲线回归得出的Q235钢动态再结晶的动力学模型和再结晶判据来判断再结晶与混晶，与实际有一定的差别，这是因为热模拟时动态回复的组织中有部分晶粒发生了动态再结晶。要准确判断混晶的发生，还需考虑形变功的储存、释放等因素的干扰。
Q235 steel produced by CSP hot rolling was investigated to determine the occurrence condition of dynamic recrystallization and predicate the recrystallization and mixed grains. The results show that the kinetic model of dynanic recrystallization and dynamic recrystallization criterion for Q235 steel were obtained according to the true stress-true strain curves to predicate the recrystalli-zation and mixed grains, the results of model and criterion were different from the practice, because dynamic recrystallization of partial grains occured in the dynamic recovery sample＇s microstructure during the process of thermal simulation. It was necessary to consideration the factors of the storage and release of deformation work when judged accurately the occurrence of the mixed grain.
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