不同热输入对TA2/409复合板焊接接头组织及力学性能的影响  

Effect of Different Heat Inputs on Microstructure and Mechanical Properties of TA2/409 Composite Plates Welded Joints

作　　者：郑祖山 陈长军[1] 张敏[1] 王顺权 Zheng Zushan;Chen Changjun;Zhang Min;Wang Shunquan(Laser Processing Research Center,School of Mechanical and Electrical Engineering,Soochozo University,Suzhou,Jiangsu 215100,China;Wuxi Institutin of Supervision and Testing on Product Quality,Wuxi,Jiangsu 214000,China)

机构地区：[1]苏州大学机电工程学院激光加工中心,江苏苏州215100 [2]无锡市产品质量监督检验院研发部,江苏无锡214000

出　　处：《应用激光》2018年第3期417-424,共8页Applied Laser

基　　金：科技部重大合作资助项目(项目编号:2010DFB3100);国家自然科学基金资助项目(项目编号:51172221);江苏省"333工程"科研资助(项目编号:BRA2017098)

摘　　要：以Cu箔为填充金属,采用碟片激光器对厚度为2mm冷轧TA2/409不锈钢层状复合板进行了拼接焊接实验,研究了不同热输入(50~150J/mm)对焊接接头宏观形貌、显微组织及力学性能的影响。实验结果表明,随着热输入的增加,焊缝横截面的熔宽、熔深及凹陷量均逐渐变大,热输入为60~150J/mm可以获得完全焊透的接头,焊缝的横截面形貌由"漏斗状"变成"沙漏状";不同热输入条件下,焊缝区的显微组织以Fe基固溶体为主,随着热输入的增加,Cu基固溶体含量逐渐减少,TiFe2含量逐渐增加,导致焊缝区中部的平均显微硬度逐渐增加;拉伸试样的断裂位置均在焊缝区,断裂方式为脆性断裂,其抗拉强度先增大后减小。当热输入为75J/mm时,焊接接头的抗拉强度可达到基材的88.6%。Using Cu foil as filler metal,2 mm cold rolled TA2/409 stainless steel laminated composite plates were butt welded by disk-laser.The effect of different heat inputs（50-150 J/mm）on macroscopic morphology,microstructure and mechanical properties of welded joints were researched.The experimental results show that as the heat input increases,the weld width,depth and deboss of welded seam cross-section gradually increase,and the full penetration welded seam is gained when heat put is 60-150 J/mm.The welded seam cross-section morphology changes from ＂hopper-shape＂to＂hourglass-shape＂.The microstructures of welded seam is dominated by Fe-based solid solution under different heat inputs.With the increase of heat input,the content of Cu-based solid solution gradually decreases,TiFe2 content gradually increases,resulting in the gradual increase of the average microhardness in the middle of the weld zone.The fractures location of the tensile specimen is in the weld zone and the fracture mode is brittle fracture.The tensile strength first increases and then decreases,when the heat input is75 J/mm,the tensile strength of the welded joint can reach 88.6% of the substrate.

关 键 词：激光焊接 复合板 显微组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]