汽车稳定杆断裂分析  

Fracture analysis of automobile stabilizer bar

作　　者：刘华东 邵百明[1] 黎军顽[2] Liu Huadong;Shao Baiming;Li Junwan(Passenger Vehicle Co.,SAIC Motor Corporation Limited,Shanghai 201805,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海汽车集团股份有限公司乘用车公司,上海201805 [2]上海大学材料科学与工程学院,上海200444

出　　处：《金属热处理》2023年第1期253-256,共4页Heat Treatment of Metals

摘　　要：某汽车稳定杆在耐久试验过程中短里程就发生断裂失效,使用直读光谱仪、硬度计、光学显微镜和扫描电镜等设备对失效件进行理化检测、金相检验和断口分析,同时结合稳定杆加工过程对断裂原因进行了分析。结果表明,失效稳定杆的断口微观形貌主要呈沿晶状,扩展区域有疲劳辉纹,最后断裂处呈韧窝状。这主要是由于稳定杆加工过程中经过酸洗处理引入了氢,导致稳定杆先发生了延迟开裂,然后在耐久试验中产生疲劳裂纹并扩展,直至最终断裂。A stabilizer bar of automobile broke was failed in a short mileage during the durability test, then the fracture cause was analyzed by physical and chemical inspection, metallographic inspection and fracture analysis of the failed parts with direct reading spectrometer, hardness tester, metallographic microscope and scanning electron microscope, and in combination with the processing process of the stabilizer bar. The results show that the fracture morphology of the failed stabilizer bar is mainly intergranular, there are fatigue striations in the extended region, and the final fracture is dimpled. This is mainly due to the introduction of hydrogen through pickling treatment during the processing of the stabilizer bar, resulting in delayed cracking of the stabilizer bar first, and then fatigue and propagation in the durability test until the final fracture.

关 键 词：稳定杆 沿晶断裂 疲劳 延迟开裂 

分 类 号：TG157[金属学及工艺—热处理]