摘要
为避免NiTi合金与不锈钢焊接时Ti-Fe及Ti-Ni等脆性金属间化合物的形成,采用V/Nb复合中间层与双道激光焊接的方法对NiTi合金与301SS异种金属进行焊接,并对接头的显微组织和力学性能进行分析,揭示其连接机理。试验结果表明,由于未熔化V和Nb的存在成功阻碍了熔池中NiTi合金和301 SS的混合,抑制了接头中Ti-Fe及Ti-Ni等脆性金属间化合物形成,接头的最高抗拉强度达到280 MPa。第一道焊接形成的Fe/V界面为熔化焊连接,而第二道焊接则形成了V/Nb和Nb/NiTi两个连接界面,V/Nb界面为熔化焊连接,Nb/NiTi界面为接触反应钎焊连接。
To prevent the formation of brittle intermetallic compounds such as Ti-Fe and Ti-Ni,the dissimilar metal of NiTi alloy and 301 SS were welded by V/Nb multi-interlayer and double laser welding.The microstructures and mechanical properties of the joints were studied by means of optical microscopy,scanning electron microscopy and energy dispersive spectrometer(EDS).The results show that the mixing of NiTi alloy and 301 SS is prevented by the presence of unmelted V and Nb during welding processing,thus no brittle intermetallic compounds such as Ti-Fe and Ti-Ni are formed in the joints.The maximum tensile strength of the joints increased to 280 MPa.The 301 SS and V were joined by fusion welding for first pass welding,while the two metallurgical bonding zones based on different bonding mechanisms were obtained in the second pass welding.V and Nb was joined by the fusion welding mechanism,and contact reaction brazing was responsible for bonding Nb and NiTi.
作者
王小强
高晓龙
刘晶
李伦坤
WANG Xiaoqiang;GAO Xiaolong;LIU Jing;LI Lunkun(College of Mechanical and Electronic Engineering,Xinjiang Institute of Engineering,Urumqi 830023;Laser Intelligent Manufacturing and Remanufacturing Engineering Technology Research Center,Xinjiang Institute of Engineering,Urumqi 830023;School of Mechanical Engineering,Baoji University of Arts and Sciences,Baoji 721016;Shaanxi Province Key Laboratory of Advanced Manufacturing and Evaluation of Robot Key Components,Baoji 721016)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2022年第8期136-142,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(51905006)
陕西省自然科学基金(2018JQ5204)
陕西省重点研发计划(2021GY-322)
科技助力经济2020重点专项(SQ2020YFF0419689)资助项目。
