摘要
采用厚度为0.5 mm钒片作为中间层,在1 050℃/10 MPa/1 h的工艺条件下,对钨/钢异种材料进行扩散焊接.采用扫描电镜、能谱仪和纳米压痕分别对接头的微观组织、元素分布及显微硬度进行分析和测试;对接头的拉伸性能进行测试,并对其断口形貌和元素分布进行分析.结果表明,利用母材与中间层之间元素的相互扩散,可实现钨/钢材料的焊接;钨/钢焊接接头界面区由钨-钒固溶体层、未反应钒层及钒-钢扩散层3部分组成,其中钒-钢界面层结构为钒/VC层/脱碳层/钢;钢/钒扩散层具有最高的显微硬度;钨/钢接头抗拉强度为75 MPa,含脆性相VC的钒/钢界面是接头失效的主要断裂源.
The interface characteristics between W and ferrite steel(FS) diffusion welded with a V interlayer of 0.5mm in thickness was investigated in vacuum hot pressing furnace at 1 050 ℃ for 1h and 10 MPa.Microstructures,element compositions and micro-hardness of joint were analyzed and tested with field-emission scanning electron microscopy(FE-SEM),energy dispersive spectroscopy(EDS) and nanoindenter,respectively.Tensile strength was tested with mechanical test machine.Results showed that,a reliable bonding on W / FS interfaces by means of diffusion welding between matrix and V interlayer was obtained.The W / FS joint is a multilayer sandwich structure,which includes the transition zone of W / V,the residual V interlayer and the diffusion layer of V / FS.Meanwhile,the transition zone of W / V was mainly composed of a solid solution structure and the V / FS diffusion layer with the highest hardness where there was a definite structure of V / VC layer / decarburized layer / FS.The tensile strength of joint reaches 75MPa and V / FS interface is main fracture source because of containing brittle VC phase.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第12期17-20,1-2,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50774098)
国家863高技术研究发展计划资助项目
教育部"长江学者特聘教授"奖励计划
关键词
钨
钢
扩散焊
中间层
界面组织
tungsten
steel
diffusion bonding
interlayer
microstructure
