Abstract
Fatigue crack propagation behavior was investigated for high tensile sintered steels of about 1000MPa level.
It was made clear that the diffusion bonded steel was most excellent as for the fatigue crack propagation behavior. The difference of fatigue crack propagation behavior with the different Ni content and sintered density was found to be significant, even if the alloying method was the same.
As for high tensile sintered steel, it was found that fatigue crack propagated through grain boundaries.
