Constitutive model of high temperature plastic deformation of P91 alloy steel

Abstract

The hot compression test of as-cast P91 alloy steel was carried out by Gleeble3500 multi-functional thermal simulation test machine under the deformation conditions of temperature of 900 ~ 1 100 °Cand strain rate of 0, 1~5 s-1. The high temperature flow behavior of as-cast P91 alloy steel was studied. The effects of strain rate and deformation temperature on the two-phase relationship of as-cast P91 alloy steel were analyzed. The strain rate compensation factor Z was introduced, and the Arrhenius constitutive model equation was established. The results show that the theoretical value of the peak stress calculated by the constitutive model is in good agreement with the experimental results, and the correlation is 96, 8 %, which verifies the feasibility of the model.

Keywords

• P91 alloy steel
• high temperature plastic deformation
• stress-strain curves
• constitutive equation
• Arrhenius model