Abstract
Rotating bending fatigue tests were carried out on annealed 0.42 % C steel specimens with a circumferential notch in air and in oil. Although the increase in fatigue strength due to the existence of oil becomes more pronounced with decreasing stress level, it becomes smaller near the fatigue limit. The main reason for the increase in fatigue strength is the wedging action of the oil. The lowering of the difference in fatigue limits under both environments is caused by the following two effects: lowering of the wedging action of the oil with decreasing crack opening displacement in the crack arresting process, and decrease in the oxide-induced crack closure due to the isolation of atmosphere.
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