理化检验-物理分册2025，Vol.61Issue(8)：84-87,4.DOI:10.11973/lhjy-wl240136
某汽车发动机连杆断裂原因
Reason for the fracture of a certain car engine connecting rod
王勇 1李建杰2
作者信息
- 1. 溧阳市金昆锻压有限公司,溧阳 213300
- 2. 苏州集萃高合材料科技有限公司,苏州 215500
- 折叠
摘要
Abstract
The connecting rod of a certain car engine broke during the factory testing process.The reasons for the fracture of the connecting rod were analyzed using macroscopic observation,scanning electron microscopy and energy spectrum analysis,metallographic examination,chemical composition analysis,hardness testing.The results show that the residual protective slag on the surface of the original steel billet caused the smallest plastic deformation at the small head hole of the connecting rod to break first.The connecting rod underwent long-term high-temperature oxidation during the heating process before forging,and the cracks continued to propagate,resulted in insufficient bearing capacity of the small head hole and ultimately led to overload fracture of the connecting rod body.关键词
连杆/C70S6钢/过载断裂/小头孔/夹杂物Key words
connecting rod/C70S6 steel/overload fracture/small head hole/inclusion分类
通用工业技术引用本文复制引用
王勇,李建杰..某汽车发动机连杆断裂原因[J].理化检验-物理分册,2025,61(8):84-87,4.
