重型卡车螺旋弹簧断裂原因OA

A certain spiral spring of a heavy-duty truck broke during use.The fracture cause of the spiral spring was analyzed using macroscopic observation,chemical composition analysis,scanning electron microscopy analysis,hardness testing,and metallographic examination.The results show that the fracture of the spiral spring originated from the grinding plane of the part end,and there was a secondary quenching phenomenon on the grinding plane,forming white bright martensite.The spiral spring was subjected to repeated compression or tensile loads during service,causing microcracks to form at the abnormal white bright martensite,which rapidly propagating and ultimately leading to a one-time fracture of the spiral spring.