Abstract
The effect of grain-boundary serration on the improvement of high-temperature low-cycle fatigue strength was investigated using 21Cr-4Ni-9Mn austenitic heat-resisting steel. The grain boundaries were serrated by grain-boundary reaction precipitates. Fatigue life and fatigue-crack growth rate were examined at 973K in air. These fatigue properties were considerably improved by the serrated grain boundary. Fatigue cracks were propagated mainly on the serrated grain boundary or on the interface between the grain-boundary reaction nodule and the grain. Therefore, cracks were largely deflected and brittle intergranular fracture was inhibited. The retardation on the fatigue crack growth was explained by these changes in fracture mode.
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