Abstract
Very high cycle fatigue (VHCF) of a Ni-based single crystal superalloy processed by high-rate solidification (HRS), liquid metal cooling (LMC) and HRS plus hot isostatic pressing (HIP), respectively were studied at 1000 °C, 20 kHz and R = -1. For HRS and LMC, the fatal cracks mainly initiate from casting pores surrounded by a rough zone. γ′-rotation as the main feature within the rough zone is related to the operation of {111}〈110〉 and {111}〈112〉 slip systems. HRS+HIP specimens mainly fail from the surface and they present the best VHCF property. LMC process could increase the VHCF durability like HIP treatment, especially at very low loading conditions.
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