Abstract
In this study, a 2D Cellular automaton (CA) model was developed to visually and quantitatively predict the microstructural evolution of magnesium alloy AZ31B during hot deformation. Hot compressive and metallographic tests were carried out to evaluate the CA model parameters including the work hardening (WH) coefficient, dynamic recovery (DRV) coefficient, nucleation rate and grain boundary mobility. Firstly, the values of CA model parameters under tested conditions were identified based on the experimental true stress-strain curves. Then, the functional relationships between the model parameters and deformation conditions (deformation temperature and strain rate) were established. Using the developed CA model, the flow behaviors and microstructural evolution of magnesium alloy AZ31B during hot deformation were simulated and discussed. The agreement between CA simulated and experimental results indicates that the developed CA model can accurately predict the microstructural evolution of magnesium alloy AZ31B. In addition, a new method to calculate the CA simulated average grain size was proposed. The new proposed method can effectively decrease the effects of DRX nuclei on the calculated value of average grain size.
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