喷丸产生的表层残余压应力使中温回火弹簧钢60Mn的疲劳极限从930提高到1010MPa,而心部的高残余拉应力又会使疲劳极限从1010降至940MPa,严重的喷丸表面损伤可以使疲劳极限从1010降至800MPa。裂纹在计入残余应力的Mises等效应力超过材料局部强度的部位萌生。喷丸产生的残余压应力可以增强裂纹闭合效应,从而降低裂纹扩展率。
Influence of residual stress and surface morphology, resulting from shot-peen-ing, on fatigue behaviour of medium temperature tempered spring steel 60Mn have been stu-died. The induced compressive residual stress in near-surface region may improve fatigue lim-it from 930 to 1010 MPa, and the very high tensile residual stress in the interior may reduce itfrom 1010 to 940 MPa, whereas the severe surface damage may cause a drop-off of it from1010 down to 800 MPa. Fatigue cracks initiated in such position where the equivalent Misesstress, including residual stress, exceeded the local strength of the material. The compressiveresidual stress, induced by shot-peening, may intensify the effect of crack closure, so as to de-crease the crack growth rate.
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