Abstract
This paper presents a study on the bending fatigue strength of ion-nitrided gears. The bending fatigue tests for the S 45 C and SACM 645 ion-nitrided gears with different hardened depths under uniform cyclic loading conditions were carried out, and the bending fatigue strength of ion-nitrided gears was found to be much higher than those of the normalized gears. The bending fatigue limit loads of the S 45 C ion-nitrided gears was found to be almost equal to those of the S 45 C tufftrided gears. Furthermore the bending fatigue characteristics of the S 45 C ion-nitrided gears under two-step loading conditions was discussed on the basis of Miner's hypothesis.
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