Abstract
The combined effect of surface morphology and residual stress induced by peening on the fatigue limit of carburized steels were quantitatively elucidated to precisely estimate the fatigue limit. The fatigue limit of carburized steels treated with peening increased with decreasing the size of surface dents induced by peening, and the effect of residual stress on the fatigue limit was enhanced with a decrease in their size. Additionally, the maximum fatigue limit (1157 MPa) of carburized steels without surface dents, which is higher than those of steels treated with peening, could be estimated according to the modified Goodman diagram.
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