高周波表面硬化した鋼の疲労限度に及ぼすゆるい切欠きの効果

概要

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The effects of notch shape and effective case depth on the rotating bending fatigue limit of induction surface hardened S45C steel were investigated. The results are summarized as follows; (1) In the case of fracture from the inner part of test specimens, the fatigue limit became higher with increasing α and ECD. The reason is that the applied stress at the notch root become higher with increasing α, and the residual compressive stress at the notch root decreases with increasing ECD. However, when α exceeded a certain value, nonpropagating cracks were recognized and the fatigue limit became almost constant. (3) From the effects of α and ECD on fatigue limit, it is said that the fatigue limit becomes higher with increasing ECD in the case of α< 2, while in the case of α> 2, the fatigue limit increases with decreasing ECD and the crack initiation strength increases with increasing ECD.
社団法人日本材料学会の論文
1988-02-15