铝/钢电弧辅助激光对接熔钎焊接头组织及力学性能  

Microstructure and Mechanical Property of Arc-assisted Laser Welding-brazing Butt Joint of Aluminum and Steel

作　　者：于晓全[1] 樊丁[1,2] 黄健康[1,2] 李春玲 YU Xiaoquan;FAN Ding;HUANG Jiankang;LI Chunling(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《材料导报》2019年第15期2479-2482,共4页Materials Reports

基　　金：国家自然科学基金(51465031);甘肃省基础研究创新群体计划(17JR5RA107);甘肃省高校协同创新团队项目(2017C-07)~~

摘　　要：使用电弧辅助激光方法实现了铝合金和热镀锌钢的对接熔钎焊。对接头不同区域的组织构成及分布进行了分析,并对熔钎焊接头的力学性能进行测试,讨论了接头拉伸力学性能的影响因素及断裂行为。结果表明:根据焊缝成形可将熔钎焊对接接头分为铺展区、焊缝区、界面区,整个对接接头主要由α-Al柱状组织、Al-Fe金属间化合物等微观组织构成。根据断裂位置的不同,将接头的断裂分为两种典型的模式:由于晶界元素偏析而引起的焊缝区断裂,以及金属间化合物引起的铝/钢界面区断裂。接头的抗拉力学性能由焊缝成形、焊缝组织及金属间化合物等多种因素共同决定。Using arc-assisted laser welding-brazing method,an aluminum alloy was joined to steel in a butt configuration.The composition and distribution of microstructure in different zones of the joint were analyzed,and the mechanical properties of the weld joint were tested.The effect factors of tensile mechanical properties and the fracture behavior of the joint were discussed.The results show that,according to the formation of weld joint,the welding-brazing butt joint can be divided into fusion zone,wetting-spreading zone and interface zone.The joint is mainly composed ofα-Al columnar crystal microstructure and Al-Fe intermetallic compound.According to the fracture location,the fracture of the joint can be divided into two typical modes:the fracture in the fusion zone,which caused by the segregation of grain boundary,and the fracture at the Al/steel interface zone caused by the intermetallic compounds.

关 键 词：铝合金/镀锌钢 电弧辅助激光熔钎焊 显微组织 力学性能 

分 类 号：TG457[金属学及工艺—焊接]