60Si2Mn弹簧钢的断裂失效分析  

Fracture failure analysis of 60Si2Mn spring steel

作　　者：聂小龙 高加强[2] 孟开仁 王军艺[2] 刘新宽[1] Nie Xiaolong;Gao Jiaqiang;Meng Kairen;Wang Junyi;Liu Xinkuan(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Baosteel Research Institute,Shanghai 201900,China;Huawei Technology Co.,Ltd.,Zhuji Zhejiang 311800,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093 [2]宝钢研究院,上海201900 [3]华玮科技股份有限公司,浙江诸暨311800

出　　处：《金属热处理》2021年第8期246-250,共5页Heat Treatment of Metals

摘　　要：60Si2Mn弹簧钢在正常服役过程中出现断裂,断裂后部分原件损失,根据材料力学原理,并结合断口特征,确定断裂起源位置;采用光学显微镜、扫描电镜、体视显微镜、直读光谱仪等对残留端口的显微组织、宏微观断口形貌和化学成分等进行观察和检测分析,以确定断口起源和断口特征。结果表明:由于生产过程操作不当,弹簧表面存在微裂纹,同时由于喷丸处理的工艺不恰当,造成弹簧表面形成较深的应力线,应力线发展成为沿应力线的开裂和脱落。这些微裂纹、开裂以及脱落,作为弹簧的疲劳断裂源,造成了弹簧的断裂。60Si2Mn spring steel fractured during normal service,and part of the original workpiece was lost after the fracture,the fracture origin position was determined according to the mechanics of materials and combined with the characteristics of the fracture.Microstructure,macro and micro fracture morphology and chemical composition of the remained fractured parts were analyzed by means of optical microscope,scanning electron microscope,stereo microscope,direct reading spectrometer,etc.to determine the origin and characteristics of the fracture.The results show that due to improper operation of the production process,there are micro-cracks on the surface of the spring.At the same time,due to the improper shot peening process,a deep stress line is formed on the surface of the spring,and then develops into cracking and shedding along the stress line.These microcracks,cracks and shedding act as the source of fatigue fracture of the spring,and cause the spring to fracture.

关 键 词：弹簧钢 失效分析 微裂纹 应力线 喷丸 断裂 

分 类 号：TH135[机械工程—机械制造及自动化]