用无搭接法强化40Cr钢局部应力集中部位后,研究对宏观疲劳裂纹萌生的影响.结果表明,在细晶强化、马氏体强化和残余压应力等微观强化机制作用下,40Cr钢的条件疲劳极限大幅度提高.强化后的疲劳规律表明激光局部强化在抗结构疲劳设计中的优势在于低应力高循环区域.强化层断口形貌特征为穿晶和沿晶断裂的混合断口
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.
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