Simulation of Creep Deformation for P92 Steel Based on Multiple Damage Parameters

A two-damage state variable model was used to describe the softening, damage initiation and growth mechanisms of P92 steel at 650℃ under the continuous damage mechanics framework. Based on the analysis of existed creep experimental data and creep model, a methodology was proposed to determine the constitutive constants of P92 steel at 650℃. It was shown that the constitutive constants obtained from analysis of creep experimental data could simulate the creep deformation of P92 steel at 650℃ precisely, and the constitutive equations with multiple damage parameters could be extrapolated to other stress levels. The continuous damage equations based on the multiple damage parameters can give a good description of creep deformation from terms of inelastic strain rate, inner stress and microstructural evolution. Therefore, the study is of profound practical significance in engineering.