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Cyclic Deformation, Holdtime Creep and Thermomechanical Fatigue of an ODS Superalloy

Abstract Time-dependent inelastic deformation during high-temperature low-cycle fatigue has been studied by subjecting the ODS superalloy MA 6000 to discretized hysteresis loops with holdtimes at constant load. The inelastic deformation during the holdtime, recorded as a function of stress and temperature, was expressed by rate equations. This procedure gives insight into the material behaviour at various points of a stress-strain hysteresis. It is then applied to predict the stress-strain response under isothermal and thermomechanical fatigue loading. From the deformation analysis and a comparison between calculated and experimental results, conclusions concerning the internal stress evolution and deformation mechanisms acting during cyclic loading can be drawn.