钛和锶对舰船用ER4043铝合金焊丝显微组织和性能的影响  

Effect of Ti and Sr on properties and microstructures of ER4043 aluminum alloy welding wire

作　　者：王博[1] 薛松柏[1] 黄杰[1] 马超力 林中强 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]浙江宇光铝材有限公司,武义321200

出　　处：《焊接学报》2015年第6期73-76,116-117,共4页Transactions of The China Welding Institution

基　　金：金华市科技计划资助项目(2013-1-076)

摘　　要：研究了元素Ti,Sr变质对舰船用ER4043铝合金焊丝的显微组织以及焊缝力学性能的影响.结果表明,钛的加入不仅能细化α-Al基体,还能变质共晶硅,促使粗大的片状或针状共晶硅转变为短棒状,提高4043合金轧杆以及接头的抗拉强度,并且当添加量为0.08%(质量分数)时接头强度达到166 MPa,比未变质4043焊缝接头强度提高5.7%;单独添加锶对α-Al晶粒的细化效果更为明显,共晶硅相以粒状均匀分布,并且当Sr元素的添加量为0.02%时,焊缝抗拉强度达到最大值187 MP,比未变质4043焊缝接头强度提高19.1%;通过数据对比可以发现,锶对4043的变质效果明显优于钛对4043的变质效果.The effects of the addition of Ti and Sr on the microstructure of ER4043 aluminum alloy welding wire and its tensile strength of butt-welded joints with ER4043 as consumable were investigated. Experimental results show that adding a small amount of Ti can refine α-Al matrix and modify the eutectic silicon,leading to a change in the morphology of eutectic siliconfrom the large brittle flake or acicular to fine fibrous morphology,thas resulted in the improvement of the mechanical properties o ER4043 aluminum rod and butt-welded joint. When the conten of Ti was at 0. 08%,the tensile strength of the joint reached 166 MPa which is 5. 7% higher than that of unmodified ER4043 aluminum alloy welding wire. With the appropriate addition of S the refinement of α-Al was more obvious and the granular eutectic silicon phases evenly distributed. Moreover,when the conten of Sr was at 0. 02%,the tensile strength of the welded join reached the maximum value 187 MPa,which enhanced 19. 1%compared with the joint welded with unmodified ER4043 aluminum alloy wire. By comparing the data as mentioned above,i can be found that the modification effect of Sr on the ER4043 aluminum alloy is significantly superior to that of Ti.

关 键 词：Ti元素 Sr元素 4043铝焊丝 显微组织 力学性能 

分 类 号：TG457.14[金属学及工艺—焊接]