Abstract
This paper deals with effects of surface treatment on the bending fatigue strength of SCM 415 carburized spur gears. The test gears are shot peened, chemical polished and electropolished after carburization. The constant stress amplitude fatigue test is performed by using an electrohydraulic servo-controlled pulsating tester. The SN curves are obtained and the enhancement of fatigue strength due to surface treatment is clarified. The effect of surface conditions on the fatigue strength is evaluated quantitatively, and it is close to the relative surface condition factor used in the ISO strength rating formula.
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