摘要
某柴油机用30CrMoSi钢高强度螺栓在使用过程中发生断裂。通过化学成分分析、金相检验、断口分析、硬度测试等方法对螺栓断裂原因进行了分析。结果表明:螺栓断裂为早期疲劳断裂,螺栓螺纹根部存在加工缺陷以及螺栓材料中存在较多的非金属夹杂物是导致其疲劳断裂的主要原因。最后针对螺栓断裂原因提出了预防措施。
High strength bolts with material of 30CrMoSi steel used for diesel engine fractured during service, and the fracture reasons were analyzed by means of chemical composition analysis, metallographic examination, fracture analysis and hardness test. The results show that the fracture of the bolt was early fatigue fracture, and machining defects at the screw root and more inclusions in the material were main reasons for the fatigue fracture. Finally, prevention measures were put forward for the fracture reasons.
出处
《理化检验（物理分册）》
CAS
2016年第6期431-434,共4页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
国家自然科学基金资助项目(51102074
51272065
51372065)
河北省自然基金资助项目(E2015202070)
中科院无机涂层重点实验室资助项目(KLICM-2013)
河北省杰出青年基金资助项目(Y2012003)
关键词
螺栓
断裂
失效分析
疲劳断裂
应力集中
夹杂物
bolt
fracture
failure analysis
fatigue fracture
stress concentration inclusion
