农用机动车转向节臂断裂失效分析  

Failure Analysis of Farm Vehicle Steering Knuckle Arm

作　　者：时军波[1] 徐娜[1] 李永德[1] 马虹[1] 郭卫民[1] 

机构地区：[1]山东省科学院山东省分析测试中心山东省材料失效分析与安全评估工程技术研究中心,山东济南250014

出　　处：《热加工工艺》2013年第22期207-209,共3页Hot Working Technology

基　　金：山东省科学院科技发展基金项目[科基合字(2011)第4号]

摘　　要：通过宏观形貌检查、金相检验、化学成分分析、扫描电镜及能谱分析等手段,对转向节臂的断裂原因进行分析。结果表明:转向节臂的连接环内孔存在加工刀痕是导致疲劳裂纹萌生的主要原因,材料调质处理不当。存在严重的夹杂物以及使用过载是使转向节臂提前破坏的直接因素。建议改善机加工工艺,使用40Cr钢,做好调质处理并尽可能避免使用时过载。By macroscopic inspections, chemical analysis, metallurgical examinations, scanning electron microscope and EDS analysis, the fracture reasons for steering knuckle arm were analyzed. The results indicate that cracks are formed by alternative bending fatigue at machining marks of connecting ring hole in steering knuckle ann. Improper heat treatment, serious inclusions and overload are responsible for the early failure of the steering knuckle arm. It is better to improve the machining process, using 40Cr steel for making steering knuckle arm, and do good quenching and tempering treatment as well as avoiding overload is necessary.

关 键 词：转向节臂 断裂 加工刀痕 夹杂物 

分 类 号：TG142.4[一般工业技术—材料科学与工程]