添加QCr0.8阻隔层的钛/钢电子束焊接接头组织与性能  

Microstructure and Mechanical Properties of Ti/Steel Joint Welded by Electron Beam with Adding a QCr0.8 Barrier Layer

作　　者：王廷 张秉刚[2] 张艳桥 冯吉才[1,2] 钟诗胜[2] 

机构地区：[1]哈尔滨工业大学(威海),山东省特种焊接技术重点实验室,山东威海264209 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2014年第5期1209-1213,共5页Rare Metal Materials and Engineering

基　　金：国家国际科技合作专项(2011DFR50760);哈尔滨工业大学科研创新基金(HIT.NSRIF.2014130)

摘　　要：采用1.5 mm厚QCr0.8铬青铜作为阻隔层进行了TA15钛合金与304不锈钢的电子束焊接,重点分析了焊接接头的横截面形貌、微观组织和力学性能。结果表明,焊缝中存在约0.5 mm宽的未熔QCr0.8阻隔层,实现了Ti元素与Fe元素的物理隔离,避免了Ti-Fe化合物的形成。铜/钢侧焊缝由铜基固溶体与铁基固溶体组成。而钛/铜侧焊缝中V元素的加入很好地抑制了Ti-Cu界面化合物的大量生成,焊缝组织由铜基固溶体、(Ti,V)基固溶体及少量Ti-Cu化合物组成,提高了该区域的强度和塑性。未熔铜阻隔层在热作用下发生软化,接头拉伸断裂发生在未熔的QCr0.8上,接头抗拉强度为293 MPa,为塑性断裂模式。Electron beam welding of TA 15 titanium alloy to 304 stainless steel was carried out with a 1.5 mm thick QCr0.8 bronze barrier layer.Cross section, microstructure and mechanical properties of the joint were examined. The results show that a 0.5 mm wide unmelted QCr0.8 barrierlayer exists in the weld, and thus Ti element is physically isolated from Fe to avoid the formation of Ti-Fe intermetallics. The Cu/Fe weld ischaracterized by solid solutions of copper and iron. As to the Ti/Cu weld, the interracial Ti-Cu intermetallics is restricted by the addition ofvanadium element, the weld is composed of solid solution of copper and （Ti, V） with a small amount of Ti-Cu compounds. Consequently, thestrength and toughness of this zone are improved. The unmelted barrier layer is softened under the welding thermal cycle. Fracture occurs in theunmelted QCr0.8 alloy, with a tensile strength of 293 MPa and a plastic fracture mode.

关 键 词：TA15钛合金 304不锈钢 QCr0 8阻隔层 显微组织 力学性能 

分 类 号：TG456.3[金属学及工艺—焊接]