【摘要】 对断裂的曲轴进行了化学成分、金相、显微硬度、扫描电镜等分析,结果表明:断裂为疲劳断裂,裂纹起源于内孔表面的淬火裂纹和粗糙的内孔壁;材料中较多的疏松和偏析等缺陷降低了材料的疲劳性能,疲劳裂纹易于扩展,从而导致曲轴的断裂。更多还原

【Abstract】 The fractured crankshaft was analyzed by chemical composition,metallographic analysis,microhardness analysis,and scanning electron microscope.The results show that the fracture is fatigue fracture,and the crack originates in quenching cracks of inner hole surface and rough inner hole surface.More defects such as loose and segregation of the materials reduce fatigue performance,so that fatigue cracks are easy to expand,thus eventually leading crankshaft fracture.更多还原