Kinetics and Numerical Simulation of Dynamic Recrystallization Behavior of Medium Mn Steel in Hot Working

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Abstract

Thermal deformation leads to controllable and effective grain refinement and microstructure optimization in medium Mn steel. To study the appropriate hot deformation parameters, the dynamic recrystallization (DRX) behavior and grain size evolution of medium Mn steel (0.15C‐7Mn) are investigated by thermal‐compression tests. Two types of DRX flow behaviors are observed on the flow curve, that is, single peak and cyclic behaviors. Based on the linear regression of characteristic points, dynamic recovery (DRV) model and DRX model are established. The predicted flow stress using the model established conforms well to experimental results. The correlation coefficient ( R ) and average absolute relative error ( AARE ) are 0.99% and 4.95%, confirming the accuracy of the model. After obtaining the value of DRX grain sizes by metallographic observation, grain size evolution model is developed to estimate the microstructure evolution. In addition, the established models are incorporated into DEFORM‐3D to simulate the kinetics and microstructure evolution of DRX. The simulation values are in good agreement with the experimental results, indicating that the finite element method (FEM) is an effective and accurate way for the analysis of thermal compression.

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