Abstract: In order to reveal the game relation and evolution between grain refinement and grain coarsening in the process of Ni80A thermoplastic deformation, dynamic recrystallization and grain growth models were established based on grain refinement isothermal deformation experiment and grain growth coarsening experiment, respectively. Based on the mathematical model and finite element analysis, it was found that the game relation of dynamic recrystallization grain refinement and grain growth coarsening in the process of Ni80A thermoplastic deformation jointly determine the nonlinear evolution of grain size, and the game relation diagram of the two mechanisms of grain size evolution was drawn to analyze their independent and coupling effects on grain size. The results show that the grain growth coarsening is dominant in the early stage of deformation, the dynamic recrystallization grain refinement is dominant in the middle and late stage of deformation, and the grain size is affected by the game of them in the whole thermoplastic deformation process.
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2021, Vol. 35 
