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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.

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