后车轮螺栓断裂失效分析  

Fracture failure analysis of rear wheel bolts

作　　者：宣祎恂 叶晨 马文清 沈飞 陆喆霄 李佳俊 李振刚 Xuan Yixun;Ye Chen;Ma Wenqing;Shen Fei;Lu Zhexiao;Li Jiajun;Li Zhengang(Zhejiang Guojian Testing Technology Co.,Ltd.,Haiyan 314300,China;Jiaxing Blue Arrow Instrument Calibration Co.,Ltd.,Haiyan 314300,China)

机构地区：[1]浙江国检检测技术股份有限公司,浙江海盐314300 [2]嘉兴市蓝箭仪器校准有限公司,浙江海盐314300

出　　处：《金属制品》2018年第5期52-55,共4页Metal Products

摘　　要：载重车后车轮螺栓在安装轮胎螺母时断裂。为了分析断裂的原因,应用扫描电子显微镜、能谱仪、光学显微镜、直读光谱分析仪对该螺栓进行了宏观、微观、化学成分等分析,同时还进行了硬度和拉伸试验。检测结果表明:由于螺栓存在较严重的偏析、疏松缺陷,在安装预紧力作用下缺陷处产生裂纹并不断扩展,导致螺栓脆性断裂。The rear wheel bolts of the truck are broken when installing the tire nut. In order to analyze the reason of fracture, the macroscopic, microscopic and chemical composition of the bolt were analyzed by scanning electron microscope, energy dispersive spectrometer, optical microscope and direct reading spectrometer. The hardness and tensile test were also carried out. The test results show that the bolt has serious segregation and loosening defects, and cracks are produced and propagated at the defect under the action of preloading force, resulting in brittle fracture of bolt.

关 键 词：偏析 疏松 化学成分 预紧力 脆性断裂 

分 类 号：TG115.2[金属学及工艺—物理冶金]