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利用XJG - 0 5金相显微镜及大型金相图象分析仪对曲轴断口的断裂源、扩展区的组织进行金相显微分析 ,并利用EPM - 810Q电子探针、扫描电镜、PV910 0能谱仪 ,在加速电压 2 0kV ,束斑电流 0 .0 1～ 0 .5nA的条件下 ,对曲轴断口的断裂源、扩展区的形貌特征进行了扫描观察和微区成分定性定量分析 ,得出了曲轴圆角处次表层较严重的磨削裂纹和较高的残余应力是造成曲轴早期疲劳韧性断裂重要原因
The microstructure of the fracture source and extension of crankshaft fracture was analyzed by X - ray microscopy (XJG - 0 5) and large - scale metallographic image analyzer. EPM - 810Q electron probe, SEM, PV910 0, Under the conditions of accelerating voltage of 20 kV and beam current of 0 .0 1 ~ 0.5 nA, the scanning electron microscopy (SEM) and scanning electron microscopy (SEM) were used to characterize the fracture source and extension of the crankshaft fracture. The crankshaft The more severe secondary cracks and higher residual stresses at the fillet are the main reasons for the early fatigue and ductile fracture of the crankshaft