高速铁路铜镁合金弹性吊索失效分析  

作　　者：袁远 肖柱[2] 马牧之 

机构地区：[1]中国铁道科学研究院集团有限公司标准计量研究所,北京100081 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《科技创新与应用》2023年第16期75-78,共4页Technology Innovation and Application

基　　金：中国铁道科学研究院集团有限公司科研项目(2021YJ297)。

摘　　要：该文利用扫描电子显微镜和金相显微镜观察运行过程中断裂的铜镁合金弹性吊索样品微观形貌,对样品表面的腐蚀产物进行能谱仪分析,并通过铜镁合金冷压焊模拟试验,确定材料断口处的异常组织。结果表明,样品失效形式为腐蚀疲劳断裂,在循环工作应力和含S、Cl的腐蚀性介质的共同作用下,在冷压焊缝处出现点腐蚀和腐蚀疲劳裂纹,裂纹向材料内扩展至完全断开。建议在铜镁合金弹性吊索生产时应尽可能避免冷压焊或对冷压焊表面进行应力处理及防护的措施。The micro-morphology of the elastic sling sample of copper-magnesium alloy broken during operation was observed by scanning electron microscope and metallographic microscope,the corrosion products on the surface of the sample were analyzed by energy dispersive spectrometer,and the simulation test of cold pressing welding of copper-magnesium alloy was carried out.Determine the abnormal structure at the fracture of the material.The results show that the failure mode of the sample is corrosion fatigue fracture.Under the combined action of cyclic working stress and corrosive medium containing S and Cl,pitting corrosion and corrosion fatigue cracks appear at the cold-pressed weld,and the cracks propagate into the material to break completely.It is suggested that cold pressure welding or stress treatment and protection measures should be avoided in the production of copper-magnesium alloy elastic slings.

关 键 词：Cu-Mg合金 弹性吊索 冷压焊 失效分析 腐蚀疲劳 

分 类 号：TG379[金属学及工艺—金属压力加工]