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The fatigue behavior of a polycrystalline nickel-based superalloy René 88DT was examined in the lifetime regime of 10 5 –10 9 cycles at 593°C in air using an ultrasonic fatigue apparatus operating at frequencies close to 20kHz. Three experimental techniques were combined to obtain new insights into the crack initiation process: serial sectioning, electron backscatter diffraction and...
In many engineering applications, fatigue is the dominant failure mechanism governing the life of a component. Thus, many studies have focused on this phenomenon, although there is a need for a model that addresses fatigue based on the material’s microstructure, specifically the energetics of the grain boundaries (GBs) and persistent slip bands (PSBs). Our approach is to model the energy of a PSB...
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