Characterization of the Dynamic Recrystallization Kinetics Using Directly Flow Stress Model and Its Application to 42CrMo Steel

Abstract

In order to improve and enhance the solution accuracy and practicability in prediction of dynamic recrystallization kinetics, we present a direct method to characterize the flow-related DRX parameters including two essential parameters when predicting DRX microstructural evolution which are the peak strain and the strain at 50% recrystallization. In this method, flow curves are described accurately using the general and improved C-m models in which C and m are defined as functions of strain rate at varying strains and temperatures. It eliminates the need for mathematical modeling of these parameters in order to predict the volume fraction of DRX grains and increases the practical utility of microstructural prediction by a great deal. The DRX behavior of extruded 42CrMo high-strength steel is investigated with a finite element approach using the direct method and the Avrami kinetic model. Our present method predicts the DRX kinetics volume fraction and grain size during microstructural evolution with remarkable accuracy when compared to other approaches and experiments. DRX Microstructural predictions are greatly enhanced by this method since it eschews mathematical modeling of the peak strain and the strain at 50% recrystallization in Avrami kinetic model. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.