电弧熔覆和激光喷丸对轨道交通用Al-Zn-Mg合金疲劳扩展和腐蚀性能的影响  

Effects of Arc Coating and Laser Peening on the Fatigue Growth and Corrosive Properties of Al-Zn-Mg Alloy Used in Rail Transition

作　　者：王向东 文志 剡苏荣 刘雄 陈宇强 丁浩 WANG Xiangdong;WEN Zhi;YAN Surong;LIU Xiong;CHEN Yuqiang;DING Hao(Zhuzhou CRRC Times Electric Co.,Ltd.,Zhuzhou 412001,China;Hunan University of Science and Technology,Xiangtan 411100,China)

机构地区：[1]株洲中车时代电气股份有限公司,湖南株洲412001 [2]湖南科技大学材料科学与工程学院,湖南湘潭411100

出　　处：《电焊机》2024年第10期108-115,共8页Electric Welding Machine

摘　　要：为了提高再制造修复铝合金的服役性能特别是疲劳性能和抗腐蚀性能,以轨道交通用具有代表性的Al-Zn-Mg合金板材为研究对象,在研究合金疲劳行为的基础上模拟实际服役条件对合金造成的损伤。通过不同的电弧熔覆工艺和激光冲击强化技术对产生裂纹的样品合金进行修复,综合比较了修复前后合金的服役性能差异。研究发现,与传统电弧熔覆相比,结合激光冲击强化的电弧熔覆能显著提高合金的疲劳抗力和耐蚀性,电弧熔覆结合激光冲击强化的样品在低应力因子强度范围内展现出更低的疲劳裂纹扩展速率,并在高应力因子强度范围仍维持较低的扩展速率,显著提升了疲劳寿命,同时也降低了晶间腐蚀深度,增强了合金的抗腐蚀性能。该研究结果可为轨道交通用铝合金结构件的服役寿命延长和腐蚀控制提供理论依据和科学指导。In order to improve the application performances of remanufactured and repaired aluminum alloys,especially its fatigue performance and corrosion resistance,this paper took the representative Al-Zn-Mg alloy plate used in rail transit as the research object,and simulated the damage caused by actual service conditions on the alloy based on the experiments of the fatigue behaviors.The cracked sample alloy was repaired by different electric arc cladding processes and laser shock peening techniques.The differences in application performances between the repaired and unrepaired alloys were comprehensively compared.It is found that the combination of electric arc cladding and laser shock peening can greatly improve the fatigue performance and corrosion resistance of the studied alloy compared with the traditional electric arc cladding processes.The research results can provide theoretical basis and scientific guidance for extending the service life and controlling corrosion of aluminum alloy structural components used in rail transit.

关 键 词：再制造修复Al-Zn-Mg合金 电弧熔覆 激光冲击强化 疲劳性能 抗腐蚀性能 

分 类 号：TG457.14[金属学及工艺—焊接]