TiVNbTa/Inconel 600扩散焊接头的组织与性能  

Microstructure and properties of TiVNbTa/Inconel 600 diffusion welded joint

作　　者：李娟 沈宽春 尹蓉 赵宏龙 罗少敏 周念 秦庆东[1] LI Juan;SHEN Kuanchun;YIN Rong;ZHAO Honglong;LUOShaomin;ZHOU Nian;QIN Qingdong(Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province,Guizhou Institute of Technology,Guiyang 550003,China;AVIC Guizhou Yonghong Aviation Machinery Co.,Ltd.,Guiyang 550009,China)

机构地区：[1]贵州理工学院贵州省轻金属材料制备技术重点实验室,贵阳550003 [2]中航工业贵州永红航空机械有限责任公司,贵阳550009

出　　处：《材料工程》2024年第1期200-210,共11页Journal of Materials Engineering

基　　金：贵州省科技计划项目(黔科合基础-ZK[2022]一般175);国家自然科学基金项目(51964011);贵州省教育厅科技人才成长项目(黔教合KY[2022]342)。

摘　　要：鉴于TiVNbTa难熔高熵合金优异的耐蚀性和高温强度,针对其与高温合金复合使用的潜在应用前景,研究TiVNbTa和Inconel 600的扩散焊接性能。在850~1150℃条件下对二者进行了扩散焊研究,对850~1000℃下所得接头的微观组织进行了观察,对所有温度下所得接头的剪切强度进行了检测。研究结果表明,除850℃下所得接头只含一层富Ni界面层外,其余接头均具有“Inconel 600/镍基扩散层/富Cr层/富Ti层/富Ni层/TiVNbTaNi(Fe,Cr)扩散层/TiVNbTa RHEA”多层界面结构,其中富Ni层为具有菱方晶体结构的Ni_(2)Ti型金属间化合物,富Cr层为具有密排六方晶体结构的Cr2X型Laves金属间化合物。950℃下所得接头具有最高剪切强度,其值为357 MPa,断裂主要发生在接头中具有Ni_(2)Ti型晶体结构的金属间化合物层,裂纹扩展穿过多层界面。接头界面形成机理分析结果表明,扩散焊过程中,Ti,V,Nb,Ta元素由RHEA侧向Inconel 600合金侧扩散,Ni,Fe,Cr元素由Inconel 600合金侧向难熔高熵合金侧扩散。其中,Ti和Ni元素扩散剧烈;Cr和Ni元素在界面化学反应的驱动下发生偏聚;Nb和Ta元素的扩散因Ni_(2)Ti型界面层的形成而受阻,从而出现分层。In view of the excellent corrosion resistance and high temperature strength of TiVNbTa refractory high entropy alloy,and the potential application prospect of the TiVNbTa RHEA/Inconel 600 joining component,the diffusion bonding properties were studied.Diffusion joining of the two materials under conditions ranging from 850℃to 1150℃were carried out,the joints achieved at 850~1000℃were submitted for microstructure examining,and the joints joined at all temperatures were used for shearing test.The results indicate that except for the joints obtained at 850℃,which only contain a lot of Ni-rich interface layers,all other joints have a multi-layer interface structure of"Inconel 600/Ni-based diffusion layer/Cr-rich layer/Ti-rich layer/Ni-rich layer/TiVNbTaNi(Fe,Cr)diffusion layer/TiVNbTa RHEA".The Ni-rich layer is a Ni_(2)Ti type intermetallic compound with rhombohedral crystal structure,and the Cr�rich layer is a Cr2X type intermetallic compound with hexagonal crystal structure.The joint achieved at 950℃has the highest shear strength,which is 357 MPa.The fracture mainly occurs in the weak interfacial area of Ni_(2)Ti in the joint,and the crack propagates through the multi-layer interface.The analysis of the joints formation mechanism shows that during the diffusion joining process,Ti,V,Nb,and Ta atoms diffuse from the RHEA side to the Inconel 600 side,while Ni,Fe,and Cr atoms diffuse from the Inconel 600 side to the RHEA side.The diffusion of Ti and Ni atoms is intense.The segregation of Cr and Ni elements occurs under the driving source of interfacial chemical reactions.The diffusion of Nb and Ta atoms is hindered by the formation of Ni_(2)Ti type interfacial layers,resulting in delamination.

关 键 词：扩散焊 难熔高熵合金 高温合金 微观组织 力学性能 

分 类 号：TG453[金属学及工艺—焊接]