摆动模式对7005-T6铝合金激光焊接头力学性能及腐蚀行为的影响  

Effect of oscillating mode on mechanical properties and corrosion behavior of 7005-T6 aluminum alloy laser welded joint

作　　者：解雪云 宋晓杰[1] 刘明磊 高林 曹繁 崔洪芝[1,2] 黄伟 XIE Xueyun;SONG Xiaojie;LIU Minglei;GAO Lin;CAO Fan;CUI Hongzhi;HUANG Wei(School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;School of Materials Science and Engineering,Ocean University of China,Qingdao 266404,China;Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo 315103,China)

机构地区：[1]山东科技大学材料科学与工程学院,青岛266590 [2]中国海洋大学材料科学与工程学院,青岛266404 [3]中国兵器科学研究院宁波分院,宁波315103

出　　处：《中国有色金属学报》2024年第7期2200-2214,共15页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52331004,U2106216);山东省自然科学基金重大基础研究项目(ZR2022ZD12)。

摘　　要：采用摆动激光焊对7005-T6铝合金进行焊接。利用光学显微镜、扫描电子显微镜、透射电子显微镜、电子背散射衍射和电化学工作站等研究了三种激光摆动模式对接头微观组织、力学性能和腐蚀行为的影响。结果表明:使用摆动激光焊可以有效改善焊缝成型和降低柱状晶区域宽度;引入摆动模式可以细化焊缝处晶粒,减少气孔缺陷,提高焊缝处硬度和抗拉强度;摆动模式下焊缝晶界析出相尺寸更小,分布更加弥散,降低了腐蚀倾向和明显减少剥落腐蚀失重,同时可减少剥落腐蚀影响深度。经综合性能对比,发现摆动模式优于无摆动,无穷模式优于三角模式。The 7005-T6 aluminum alloy was welded by oscillating laser welding.The effects of three laser oscillating modes on the microstructure,mechanical properties and corrosion behavior of the joint were studied by means of optical microscopy,scanning electron microscopy,transmission electron microscopy,electron backscatter diffractometry and electrochemical workstation.The results show that the oscillating laser welding can effectively improve the weld formation and reduce the width of the columnar crystal region.The introduction of oscillation mode can refine the grain of weld,reduce the porosity defect,and improve the hardness and tensile strength of weld.In the oscillating mode,the size of the precipitated phase at the weld grain boundary is smaller and the distribution is more diffuse,which reduces the corrosion tendency and the mass loss of exfoliation corrosion obviously,and also reduces the influence depth of exfoliation corrosion.By comparing the performance,it is found that the oscillating mode is better than the non-oscillating mode and the infinite mode is better than the triangle mode.

关 键 词：7005-T6铝合金 激光焊 摆动模式 力学性能 腐蚀行为 

分 类 号：TG456.7[金属学及工艺—焊接]