Abstract：Refinement of austenite grain is an important method to control the microstructure and mechanical properties of steel. In order to control the grain size of 38MnSiVS non-quenched and tempered steel during the waiting time of rolling, the recrystallized austenite grain growth law of 38MnSiVS non-quenched and tempered steel after deformation at different holding temperature and time by means of thermal deformation and quantitative metallography were studied. The results show that the recrystallization austenite grain growth process of 38MnSiVS non-quenched and tempered steel met the power exponential relationship. Sellars model,Anelli model,and Sellars-modified model are established accordingly by numerical calculation analytic method and nonlinear regression method on the basis of experimental data. Among them,the Sellars-modified model is proved to have the best accuracy of 0.73%,which could more accurately express the grain growth law of 38MnSiVS non-quenched and tempered steel. Due to the influence of deformation energy storage and other factors,the activation energy of recrystallized austenite grain growth after deformation is 161 737.65 J/mol,far lower than that of austenite grain growth during reheating.
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2020, Vol. 55 
