摩托车发动机排气阀断裂原因分析  

Analysis on Fracture Cause of Exhaust Valve of Motorbike Engine

作　　者：陈明[1] 曹标[1] 谭莹[1] 周崎[1] 莫明珍[1] 

机构地区：[1]广东出入境检验检疫局技术中心,广东广州510623

出　　处：《热加工工艺》2007年第14期47-49,共3页Hot Working Technology

摘　　要：对断裂的摩托车发动机排气阀进行宏观、金相、化学及断口分析。结果表明,排气阀氮化过程中表面未形成具有抗蚀性能的致密ε相,导致其抗氧化性能下降,在工作过程中排气阀由于受到高温及氧化气氛的作用发生氧化腐蚀疲劳,最终导致断裂。Analyses on macro, metallography, chemistry and fracture appearance were carried on broken exhaust valve in motorbike engine. The results show that dense e-phase with corrosion-resistance isn＇t formed on the surface of exhaust valve during nitriding,which reduces the oxidation-resistance of it. Oxidizing-corrosion fatigue happened because of high temperature and oxidizing atmosphere during working, and caused the rupture of the exhaust valve.

关 键 词：排气阀 氧化 氮化 腐蚀疲劳 失效分析 

分 类 号：TG156.8[金属学及工艺—热处理]