7B05-T5铝合金激光-MIG复合焊接头组织性能研究
万帅1,韩晓辉1,刘建1,沈林2,陈辉2
(1.中车青岛四方机车车辆股份有限公司,山东 青岛 266111;2.西南交通大学 材料科学与工程学院,四川 成都 610031)
摘要:采用维氏硬度、微型剪切、微拉伸和断裂韧度等试验,研究了7B05-T5铝合金复合焊接头焊缝、热影响区及母材的微区力学性能,并结合显微组织、断口扫描等分析了接头各微区力学性能的差异。结果表明:复合焊接头焊缝区组织主要为树枝晶。焊缝区域硬度最低平均为80 HV,热影响区平均硬度为110 HV,且存在宽度约为5 mm的软化区,母材硬度值最高平均为123 HV。母材的剪切强度和抗拉强度最高,热影响区次之,焊缝最低。接头热影响区抵抗裂纹扩展的能力最强,母材次之,焊缝最差。
关键词:铝合金;激光-MIG复合焊;组织;力学性能
中图分类号:TG407 文献标志码:A doi:10.3969/j.issn.1006-0316.2019.03.008
文章编号:1006-0316 (2019) 03-0030-08
Study on Microstructure and Properties of 7B05-T5 Aluminum Alloy Laser-MIG Hybrid Joint
WAN Shuai1,HAN Xiaohui1,LIU Jian1,SHEN Lin2,CHEN Hui2
( 1.CSR Qingdao Sifang Co., Ltd, Qingdao 266111, China; 2.Department of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China )
Abstract:In this paper, the micro-zone mechanical properties of the joints, heated-affected zone, and base metal of the 7B05-T5 aluminum alloy hybrid welded joint were investigated by Vickers hardness, micro-shearing, micro-tensile and fracture toughness tests, fracture scanning, etc. analyzed the differences in the mechanical properties of the joints in each micro-area. The results show that the microstructure of the weld zone is mainly dendritic. The average minimum hardness of the weld zone is 80HV, the average hardness of the heat-affected zone is 110HV, and the softening area width is about 5mm, and the average hardness of the base metal is 123 HV. The shear strength and tensile strength of the base metal are the highest, followed by the heat affected zone, and the weld is the lowest. The HAZ has the strongest ability to resist crack propagation, followed by the base metal, and the weld is the worst. 
Key words:aluminum ally;hybrid laser-MIG welding;microstructure;mechanical properties
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收稿日期:2018-08-18
作者简介:万帅(1986-),男,山东青岛人,工程师,主要从事轨道车辆制造技术研究工作。
 

 

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