Simulation of dynamic recrystallization in 23Co13Ni11Cr3Mo steel using a modified cellular automaton

Abstract

A modified cellular automaton (CA) program was developed to simulate the process of dynamic recrystallization (DRX) for 23Co13Ni11Cr3Mo ultrahigh strength steel. In this model, influences of deformation parameters on hardening rate and solute drag effect were considered. Moreover, an inverse analysis method was proposed for parameters identification of dislocation model and solute drag effect based on the results of isothermal compression tests on Gleeble-1500. Then, simulated microstructures under different deformation conditions were compared with those of experiments. A good agreement is achieved. Furthermore, influences of deformation parameters on microstructure evolution for 23Co13Ni11Cr3Mo steel were investigated in details. High strain is an effective measure to refine grain and improve homogeneity. Meanwhile, the desired deformation parameters are temperature of 1000–1050 °C and strain rate of 0.008–0.01 s⁻¹ for obtaining grains smaller than 22.5 μm.

Keywords

cellular automaton / dynamic recrystallization / 23Co13Ni11Cr3Mo, ultrahigh strength steel

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