后桥半轴断裂失效分析  

Failure Analysis of Automobile Semi-axle

作　　者：杨峰[1] 

机构地区：[1]徐州工程学院机电工程学院江苏省大型工程装备检测与控制重点建设实验室,江苏徐州221018

出　　处：《铸造技术》2016年第6期1150-1152,共3页Foundry Technology

基　　金：江苏省高校自然科学基金资助项目(12KJD430003);徐州工程学院科研基金项目(XKY2012312)

摘　　要：采用断口宏微观分析、金相组织及硬度检查等手段对汽车后桥半轴断裂性质进行理化分析。结果表明,半轴首先在花键根部发生了大应力的扭转疲劳开裂,最终沿半轴横向扭转剪切断裂。半轴反复承受过大扭矩作用是其纵向疲劳开裂的根本原因。由于半轴在调质过程中温度偏低,心部出现部分未溶铁素体及材料表面存在大量非金属夹杂物,都对疲劳性能不利。The failure mode and cause of automobile semi-axle were analyzed by macro and micro observation,metallographic examination, and hardness testing. The results show that the root of the half-shafts firstly presents high stress torsional fatigue cracking and finally torsional overload fracture happen along the semi-axis cross direction. Repeated large torque is the fundamental reason for fatigue fracture of half shafts. Because of the low temperature in the process of quenching and tempering, the presence of a large number of non-metallic inclusions on the surface and the partial insoluble ferrite in the central part of the core are harmful to the fatigue properties.

关 键 词：半轴 扭转疲劳 表面硬化 未溶铁素体 

分 类 号：U463.218.6[机械工程—车辆工程] TG115[交通运输工程—载运工具运用工程]