Abstract
Rotating bending fatigue tests were carried out for 18%Ni maraging steel in order to investigate the influence of reversion austenite on crack initiation and its propagation of maraging steel. Fatigue strength was increased by formation of reversion austenite. The increase in the fatigue strength was large near the fatigue limit. This was caused from that the crack initiation and its early propagation were suppressed by the formation of reversion austenite and the suppression was marked with decrease in stress level. Although the fatigue strength decreased by humidity, the formation of reversion austenite relieved the sensitivity of fatigue strength for humidity.
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