摘要
通过断口形貌分析、成分分析、金相分析、断口硬度分析、应力分析等方法对曲轴断裂失效原因进行分析。结果表明,曲轴中频感应淬火后未能及时回火,表面残余应力较大,在工况条件下表面产生微裂纹;同时曲轴轴肩根部产生应力集中,诱发裂纹进一步扩展,导致曲轴最终疲劳断裂。另外调质处理效果较差、曲轴芯部铁素体含量较多、整体强度不足也是造成曲轴疲劳断裂失效的原因之一。
The reason of crankshaft fi＇acture failure was analyzed by fracture morphology observing, chemical analysis, metallographic analysis, fracture hardness test and stress analysis etc. The results show that after induction hardening and the crankshaft is not tempered, the micro-crack on teh surface is engendered by the larger residual stress in the operation condition; the micro-crack is expanded by stress concentration in the root of crankshaft, it leads to crankshaft fatigue fracture at last. The high content of ferrite in the middle of crankshaft by poor effect of thermal refining is one reason for crankshaft fatigue fracture.
出处
《热加工工艺》
CSCD
北大核心
2013年第2期193-195,198,共4页
Hot Working Technology
基金
江苏省精密与微细制造技术重点实验室开放基金资助项目(JSPM200705)
扬州市市校产学研合作专项(SCX201110019)
关键词
曲轴
失效分析
疲劳断裂
应力分析
crankshaft
failure analysis
fatigue fracture
stress analysis
