Abstract
The high-cycle fatigue behavior of the Japanese Primary Candidate Alloy (JPCA) was determined at 703 K in vacuum. Four different thermomechanical treatments produced the changes in dislocation structure and dispersion of Ti-rich MC type carbides. Applying load controlled sine waves of 30 Hz in tension-compression mode, ductile fractures with striations and dimples were observed for both solution annealed and subsequently aged alloys at 1073 K, while brittle facets and wavy patterns with tearing by shear were observed for 15% cold worked alloy. The fatigue life was shown to be improved by the cold work in the relatively high-stress and short-life regime. But the fatigue endurance limit at 10 7 cycles for cold worked JPCA was 550 MN/m 2, slightly lower than that for solution annealed JPCA, and was furthermore decreased by aging for the precipitation of MC type carbides.
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