Mathematical model of dynamic recrystallization of austenite in low carbon steel under ESP process
The dynamic recrystallization behavior of low carbon steel under ESP process was simulated by using MMS-200 thermal simulation tester.Considering the influence of austenite grain size change before deformation,the dynamic recrystallization mathematical model was established.The results show that:the initial microstructure under ESP process condition can be simulated by austenitizing at 1 350 ℃ and holding for 300 s,and the larger the initial austenite grain size,the more difficult dynamic recrystallization is to occur;the dynamic recrystallization activation energy increases with the increase of the initial austenite grain size,and the initial austenite grain size has no effect on the relationship coefficient s between peak strain and critical strain;considering the effect of initial austenite grain size,dynamic recrystallization activation energy model,peak strain model and dynamic recrystallization dynamic model of experimental steel were established.The research results lay a theoretical foundation for developing high quality thin-gage low carbon steel and improving the prediction model precision of microstructure properties under ESP process conditions.
endless rollingaustenitegrain sizedynamic recrystallizationmathematical model
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维普
