Abstract
Rotating bending fatigue tests were carried out on plain specimens and specimens with a small blind hole of an annealed 0.42% C steel in air and in oil, and the small fatigue crack initiation and growth behavior in both test environments were examined based on successive surface observations using the plastic replica method. Fatigue strength in oil is higher than that in air. The main reason is that the earlier fatigue crack growth is suppressed by the isolation of the atmosphere due to the existence of oil.
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