High Temperature Flow Stress Model of Carbon Steel

Concise and universal high temperature flow stress model of carbon steel containing dynamic recrystallization is described. Conditions that the model should satisfy are proposed by analyzing the possible shapes of the stress-strain curves. Focusing on the conditions and combining with the existing research results, the high temperature flow stress models containing the dynamic recrystallization information are first established through rigorous mathematical derivation. Single pass compression experiments of Q235B are done by using the thermal simulation machine Gleeblel500. High temperature flow stress models of Q235B are established through nonlinear fitting of experimental data. Analytical results show that the models for Q235B are consistent with the experimental results, and the model proposed are reasonable and accurate. This work provides a new method for the establishment of high temperature flow stress model.