軸受用鋼における表面起点はくりと内部起点はくりのころがり疲れ寿命

概要

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The mechanism of the asperity-contact-initiated fatigue was investigated in thrust type rolling fatigue tester. Microcracks appeared on the track surface at a considerably large number of cycles before the occurrence of the spalling failure. The electroslag remelted SUJ2 (AISI 52100) steel had a longer life than the degassed SUJ2 steel under conditions of predominating subsurface-initiated fatigue. However, it was found that this difference disappeared perfectly in the surface-initiated fatigue.The same rolling fatigue behavior was found on six heats of carburized 4320 steel having different material cleanliness. In contrast to them, the influence of metallurgical characteristics of carburized steel was remarkable in the surface-initiated fatigue but not in the subsurface-initiated fatigue.
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