Abstract
The influence of orientation and temperature on fatigue short crack propagation behavior of Inconel 718 alloy was studied at both 25 °C and 650 °C by in-situ fatigue testing under scanning electron microscope. The fatigue crack growth rates (FCGR) showed evident dependence on orientation at both temperatures, following: XZ < X < Z. The FCGR difference of XZ and Z orientation became less pronounced at 650 °C. Fatigue cracks exhibited commonly transgranular fracture at both temperatures, with enhanced FCGR at 650 °C. Microstructurally short crack propagation showed evident fluctuations, which were closely related to the blocking effects of grain boundaries.
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