摘要:
采用厚度为0.5 mm钒片作为中间层,在1050℃/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.
关键词:
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钨
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钢
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扩散焊
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中间层
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界面组织
Abstract:
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 1050℃ 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.
百度学术
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