FATIGUE CRACK INITIATION ON NON-OVERLAPPED LASER HARDENED 40Cr STEEL

Acta Metall Sin

1993, Vol. 29

Issue (12): 34-38 DOI:

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FATIGUE CRACK INITIATION ON NON-OVERLAPPED LASER HARDENED 40Cr STEEL

LIU Changsheng;CAI Qingkui;XU Hao Northeastern University; Shenyang

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LIU Changsheng;CAI Qingkui;XU Hao Northeastern University; Shenyang. FATIGUE CRACK INITIATION ON NON-OVERLAPPED LASER HARDENED 40Cr STEEL. Acta Metall Sin, 1993, 29(12): 34-38.

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Abstract Study was carried out of the effect of overlapping or not on the fatiguemacro-crack initiation on the notch root of 40Cr steel specimens treated by newly developedtechnique of laser local hardening. The resistance to fatigue macro-crack initiation may bemade by grain refining, marstrengthening and residual compressive stress. In the light ofbehaviour of fatigue fracture, the superiority of local laser hardening to improve the fatigueresistance is in the range of low stress amplitude and high cycles. The morphology of the frac-ture surface in the hardened specimen is a mixed one of transgranular and intergranular.

Key words: 40Cr steel laser fatigue macro-crack initiation

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1993/V29/I12/34

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