Abstract
Strain controlled creep-fatigue experiments of P92 steel with various strain amplitudes and holding time were conducted under 600 °C. The effect of strain amplitude on cyclic softening and stress relaxation behavior is negligible. However, the holding time has a greater impact on both. A new constitutive model within the framework of Chaboche model was developed by improving the nonlinear isotropic hardening law and kinematic hardening law with cyclic characteristic parameters. According to the experimental data, the constitutive model deduced above was applied on P92 steel, and the reliability of the model was also verified, in which the cycle characteristics of P92 steel under creep-fatigue was finely described.
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