Modeling the flow stress for single peak dynamic recrystallization

A model is developed to predict the flow stress for single peak dynamic recrystallization during hot working based on the analysis of the mechanism of the process. The model reveals the dependence of flow stress on strain, strain rate, temperature and microstructure. The flow stress in the recrystallized zone is derived by an integral with the recrystallized volume fraction as the variable. The correlation between the microscopic variable and flow stress is investigated with the model. The performance of the model is evaluated through application on magnesium alloy AZ31D. The mean error of flow stress between the experimental and predicted results is examined. Good agreement between the predicted and experimental data is achieved. All mean errors are between −5.9% and 6.7%.