铝/钢电弧辅助激光对接熔钎焊接头组织及力学性能
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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 of α-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.
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 of α-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.
引文
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5 Zhao X D,Xiao R S. Chinese Journal of Lasers,2012,39(4),74(in Chinese).赵旭东,肖荣诗.中国激光,2012,39(4),74.
6 Qin G L,Su Y H,Wang S J. Acta Metallurgica Sinica,2012,48(8),1018(in Chinese).秦国梁,苏玉虎,王术军.金属学报,2012,48(8),1018.
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8 Lin S B,Song J L,Ma G C,et al. Transactions of the China Welding Institution,2009,30(7),9(in Chinese).林三宝,宋建岭,马广超,等.焊接学报,2009,30(7),9.
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