摘要
采用化学成分分析、金相分析、硬度测试、X射线衍射法残余应力测试和扫描电镜断口观察等手段,对发生断裂的铁路机车HXD3B一系弹簧断裂失效原因进行分析。结果表明,弹簧的组织出现了明显的混晶现象,弹簧表面出现较为严重的脱碳现象,在工作过程中若承受过大应力时,在夹杂物处产生疲劳裂纹源,最终导致该弹簧早期疲劳断裂失效。
Fracture cause of the class Ⅰ spring used in HXD3 B locomotive was investigated by means of chemical composition analysis,metallographic analysis,hardness test,residual stress test by X-ray diffraction and fracture observation by scanning election microscopy.The results show that there exists mixed grain size and a severe decarburization phenomenon on surface of the spring,when the external stress is excessive,fatigue crack source initiates from inclusions and finally results in fatigue fracture of the spring.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第8期189-192,共4页
Heat Treatment of Metals
基金
贵州省科技厅工业攻关项目(筑科合同[2013101])
关键词
弹簧
混晶
脱碳
夹杂物
疲劳断裂
spring steel
mixed grain
decarburization
inclusion
fatigue fracture
