Sc对ER5356焊丝接头组织与性能的影响  

Effect of Sc on microstructure and properties of ER5356 wire joint

作　　者：王卓 曾浩林 丁桦 陈东高[2] 杨文静 WANG Zhuo;ZENG Haolin;DING Hua;CHEN Donggao;YANG Wenjing(College of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Ningbo Branch of Chinese Academy of Ordnance Sciences,Ningbo 315103,China;Liaoning Province Key Laboratory of Key Metal Structural Materials for Lightweight,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]中国兵器科学研究院宁波分院,浙江宁波315103 [3]辽宁省轻量化用关键金属结构材料重点实验室,辽宁沈阳110819

出　　处：《兵器材料科学与工程》2024年第4期1-7,共7页Ordnance Material Science and Engineering

基　　金：国家自然科学基金(U2241248)。

摘　　要：分别以Al-Mg和Al-Mg-Sc焊丝作为填充材料,采用MIG焊接工艺对20 mm厚7A52铝合金板进行对接焊。分析了Sc对接头显微组织、力学性能、孔隙率的影响。结果表明:Sc的添加使熔敷金属的抗拉强度和断后伸长率分别提高了3.1%和9.1%,使其横截面的气孔率下降了66.4%;焊接接头抗拉强度和断后伸长率分别提高了3.5%和1.6%,拉伸断裂机制为韧性断裂。此外,Sc的添加细化了熔敷金属和焊缝的晶粒;使焊缝边缘组织的柱状晶的轴比降低;并在熔合区生成Al_(3)Sc粒子,成为MgZn_(2)的形核点,促进Zn向熔合区扩散。Using Al⁃Mg and Al⁃Mg⁃Sc welding wires as filler materials,the 20 mm 7A52 aluminum alloy plate was butt welded by MIG welding process.The effects of Sc on the microstructure,mechanical properties and porosity of the joint were analyzed.The results show that the addition of Sc increases the tensile strength and elongation of the deposited metal by 3.1%and 9.1%,respectively,and decreases the porosity of the cross section by 66.4%.The tensile strength and elongation of welded joints are increased by 3.5%and 1.6%respectively,and the tensile fracture mechanism is ductile fracture.In addition,the addition of Sc refines the grains of the deposited metal and the weld center area.The axial ratio of the columnar crystal at the edge of the weld is reduced.Al_(3)Sc particles are formed in the fusion zone,which become the nucleation point of MgZn_(2) and promote the diffusion of Zn to the fusion zone.

关 键 词：SC 气孔率 熔敷金属 MIG焊接 组织与性能 

分 类 号：TG442[金属学及工艺—焊接]