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Sr、La复合添加对SAl 4047焊丝氢含量及焊接接头力学性能的影响 被引量:2

Effect of Combinative Addition of Sr and La on Hydrogen Content of SAl 4047 Welding Wire and Mechanical Properties of Welded Joints
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摘要 研究了Sr、La单独和复合添加对SAl 4047铝合金焊丝氢含量以及6082焊接接头力学性能的影响。结果表明:单独添加0.015%(质量分数,下同)Sr的SAl 4047焊丝铸态组织中α-Al枝晶的二次枝晶臂间距减小,初晶硅相受抑制而消失,共晶硅相的平均尺寸为0.56μm,与不做任何添加的焊丝合金相比平均尺寸下降了84%;固体测氢试验结果表明添加0.015%Sr的SAl 4047焊丝氢含量为0.53 mL/100 g Al,采用该焊丝焊接得到的6082焊缝气孔率为1.81%,焊丝氢含量和焊缝气孔率均超标。单独添加0.08%La可使SAl 4047焊丝氢含量降低到0.18 mL/100 g Al,铸态组织中初晶硅尺寸减小且边角钝化,部分α-Al枝晶向等轴晶转变,共晶硅颗粒平均尺寸为1.24μm,La变质效果明显弱于Sr,当La添加量超过0.08%时,反而会导致针状的富La相产生,降低焊丝及焊缝的力学性能。复合添加的Al-12Si-0.015Sr-0.08La焊丝铸态组织中初晶硅和共晶硅相均完全变质,共晶硅颗粒平均尺寸为0.6μm,α-Al相以柱状晶和等轴晶形式共存;复合焊丝氢含量为0.31 mL/100 g Al,该焊丝焊接所得的6082焊缝气孔率为0.38%,焊丝氢含量和焊缝气孔率均满足标准;接头力学性能试验结果表明,复合焊丝焊接得到的接头的抗拉强度、断后伸长率、弯曲断裂角度分别为186.7 MPa、8.4%、45~52°,与未添加Sr或La的焊丝所得焊接接头相比,分别提高了6.7%、29.2%、76%。 The effect of alone or combinative addition of Sr and La on hydrogen content of SAl 4047 welding wire and mechanical properties of 6082 welded joints were investigated.The results show that the secondary dendrite arm spacing ofα-Al dendrites in the as-cast microstructure of SAl 4047 welding wire with 0.015%Sr is reduced,and the primary silicon phase is suppressed and disappears,the average size of the eutectic silicon phase is decreased by 84%compared with the wire alloy without Sr or La,it is only 0.56μm;the hydrogen content of the SAl 4047 welding wire with 0.015%Sr is 0.53 mL/100 g Al in the solid hydrogen test results,the porosity of the 6082 weld joint obtained by using the wire is 1.81%,and the hydrogen content of the welding wire and the porosity of the weld are higher than the limit value.Adding 0.08%La alone can reduce the hydrogen content of SAl 4047 wire to 0.18 mL/100 g Al.The size of primary silicon is reduced in the as-cast microstructure,and the corners are passivated;someα-Al dendrites are transformed into equiaxed crystals.The average size of eutectic silicon particles is 1.24μm,and the effect of La metamorphism is significantly weaker than that of Sr.When the addition amount of La exceeds 0.08%,it will lead to the formation of needle-like La-rich phase and reduce the mechanical properties of the wire and weld.The as-cast silicon and eutectic silicon phases are dete-riorated completely in the as-cast microstructure of the composite Al-12Si-0.015Sr-0.08La wire.The average size of the eutectic silicon particles is 0.6μm,and theα-Al phase coexists as columnar and equiaxed crystals;the hydrogen content of the composite wire is 0.31 mL/100 g Al.The porosity of the 6082 weld obtained by welding the wire is 0.38%.The hydrogen content of the wire and the porosity of the weld meet the stan-dard.The test results of the mechanical properties of the joint indicate that the tensile strength,elongation after fracture,and bending fracture angle of the joint obtained by welding the composite wire are 186.7
作者 费文潘 薛松柏 陈宇豪 吴杰 王博 林中强 FEI Wenpan;XUE Songbai;CHEN Yuhao;WU Jie;WANG Bo;LIN Zhongqiang(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Zhejiang Yuguang Aluminum Material Co.,Ltd,Wuyi 321200,China)
出处 《材料导报》 EI CAS CSCD 北大核心 2020年第10期10150-10156,共7页 Materials Reports
基金 国家自然科学基金(51675269) 江苏高校优势学科建设工程资助项目。
关键词 SAl4047焊丝 氢含量 焊缝气孔率 显微组织 力学性能 SAl 4047 welding wire Sr La hydrogen content weld percent porosity microstructure mechanical properties
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