Experimental and modeling investigation of the creep-fatigue interactive deformation behavior of PM super alloy FGH96 at evaluated temperature.

Abstract In this paper, the fatigue tests of powder metallurgy (PM) FGH96 were performed at 650 °C with four different types of dwell to study its cyclic mechanical behavior and creep-fatigue interactive deformation behavior. As shown in test results, PM FGH96 shows obvious feature of cyclic softening. Load level and dwell time are found to be important factors affecting the velocity and degree of cyclic softening. Some regular patterns are clearly displayed in the curves of creep deformation and stress relaxation, which is speculated to affect the characteristics of FGH96's sensitivity to dwell. Based on the test data and analysis, a practical cyclic plasticity-creep model was established by combining Chaboche model and simplified θ -projection model, and its capability of describing the deformation of creep-fatigue interaction behavior has been proved. The investigation of deformation and cyclic properties will be useful for instructing the establishment of creep-fatigue interactive life predicting model in the future. [ABSTRACT FROM AUTHOR]