A physically-based constitutive model for a nitrogen alloyed ultralow carbon stainless steel

Hot compression experiments of a nitrogen alloyed ultralow carbon stainless steel were performed in the temperature range of 1223-1423 K, at strain rates of 0.001-10 s(-1), and with a deformation amount of 70% on a Gleeble-3500 thermal-simulator. The experimental results show that the flow stress of the studied steel is greatly affected by processing parameters, i.e., temperature, strain, and strain rate. Based on the dislocation density theory and dynamic recrystallization kinetics, a physically-based constitutive model was developed. Comparison between the predicted and experimental flow stress indicates that the developed model has high accuracy in the case of engineering calculation. The statistical analysis further confirmed the predicting capacity of the model. (C) 2014 Elsevier B.V. All rights reserved.