填充金属对TC4钛合金激光填丝焊接头组织性能影响  

Effect of Filler Metal on Microstructure and Properties of Titanium Alloy Laser Welding Joints with Filler Wire

作　　者：方乃文 黄瑞生 龙伟民 徐锴 李伟[3] 武鹏博 尹立孟[4] 曹浩 马一鸣 邹吉鹏 Fang Naiwen;Huang Ruisheng;Long Weimin;Xu Kai;Li Wei;Wu Pengbo;Yin Limeng;Cao Hao;Ma Yiming;Zou Jipeng(Harbin Welding Institute Limited Company,Harbin 150028,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Limited Company,Zhengzhou 450001,China;Beijing Jinwei Welding Material Co.,Ltd,Tianjin 301906,China;School of Metallurgy and Materials Engineering,Chongqing University Science&Technology,Chongqing 401331,China)

机构地区：[1]哈尔滨焊接研究院有限公司,黑龙江哈尔滨150028 [2]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,河南郑州450001 [3]北京金威焊材有限公司,天津301906 [4]重庆科技学院冶金与材料工程学院,重庆401331

出　　处：《稀有金属材料与工程》2023年第5期1725-1736,共12页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2021YFB3401100);黑龙江省头雁行动计划-能源装备先进焊接技术创新团队资助(201916120);新型钎焊材料与技术国家重点实验室开放课题(SKLABFMT202005)。

摘　　要：分别采用TC3实心焊丝和Ti-Al-V-Mo系药芯焊丝作为填充金属,进行TC4钛合金板窄间隙激光填丝焊,并对获得的焊接接头组织性能进行分析研究。结果表明,两组焊接接头各区域的微观尺度区别较明显,激光填药芯焊丝焊接接头中的焊缝区与粗晶区中的α’马氏体长度较小,并且焊缝区中原始β相晶界宽度也较窄;激光填实心焊丝焊缝中α’马氏体板条约为0.55μm,板条α’马氏体之间穿插着少量残留β相,在α’马氏体内部发现位错,并形成少量的位错塞积;激光填药芯焊丝焊缝中的针状α’马氏体宽度约为0.35μm,板条α’马氏体之间同样穿插着少量残留β相,针状α’马氏体内含有少量的细孪晶和大量的位错塞积形成的位错墙,同时在相界位置也发现更加密集的位错,残留β相含量也要略多;激光填实心焊丝焊接接头焊缝区中晶粒间的取向差大于10°的大角度晶界占比约79.25%,药芯焊丝约为96.27%;激光填药芯焊丝焊接接头的焊缝区及热影响区硬度平均值及拉伸性能数值均大于激光填实心焊丝的焊接接头。TC3 solid wire and Ti-Al-V-Mo flux-cored wire were used as filler metals to carry out narrow gap laser welding of TC4 titanium alloy plate.The results show that the micro-scale differences between the two groups are obvious.For the laser filled flux-cored wire welded joint,the length ofα'martensite in the weld zone and coarse grain zone is small,and the width of originalβphase grain boundary is narrow in the weld zone.For the laser filled solid with welded joint the width ofα'martensite lath is about 0.55μm,a small amount of residualβphase is inserted betweenα'martensite and a small amount of dislocation is found inα'martensite.The width of acicularα'martensite is about 0.35μm in laser filled flux-cored wire weld,and a small amount of residualβphase is interlaced between lathα'martensite.Acicularα'martensite contains a small number of fine twins and a large number of dislocation walls;at the same time,more dense dislocations are found at the phase boundary,and the content of residualβphase is a little more.In the weld zone of laser filled solid wire weld,the proportion of grain orientation difference greater than 10°with large angle grain boundary is about 79.25%,and that of flux cored wire is about 96.27%.The average hardness and tensile property of weld zone and HAZ of laser-filled flux-cored wire welded joint is larger than those of laser-filled solid wire welded joint.

关 键 词：填充金属 钛合金 激光填丝焊 组织性能 

分 类 号：TG456.7[金属学及工艺—焊接]