使用 BNi-2 填充金属的真空钎焊时间对 Ti-6Al-4 V 至 316 L 异种接头的微观结构和机械性能的影响

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Advanced Joining Processes Pub Date : 2023-12-12 DOI:10.1016/j.jajp.2023.100176
Milad Foumani, Homam Naffakh-Moosavy
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引用次数: 0

摘要

由于物理和冶金性能的明显差异,很难通过传统焊接工艺将钛合金与不锈钢直接连接起来。在这项研究中,5 级钛合金通过真空炉与奥氏体不锈钢进行了钎焊,钎焊过程在 β 转变温度(BTT)以上进行。为了减少脆性金属间化合物的形成,在真空条件下采用了镍基填充金属(Ni-6.6Cr-4.5Si-3B),并研究了时间对接头微观结构和机械性能的影响。钎焊温度导致界面向钛合金方向增厚至 400 µm,并在扩散影响区(DAZ)附近形成了铁钛。此外,在整个过程中,等温凝固区(ISZ)变宽,导致等温凝固区中钛基合金的溶解度增加。由于界面变宽,该区域没有富镍化合物或残余填充金属。扫描电子显微镜结果表明,钛硼化物在 45 分钟后分布加强,这种演变使接头的剪切强度增加到 67 兆帕。断裂表面的断口形貌分析和 XRD 结果表明,在两步凝固反应过程中在非热凝固区(ASZ)形成的 Ti2Ni 相导致了所有接头的脆性断裂。
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The effect of vacuum brazing time on the microstructure and mechanical properties of Ti-6Al-4 V to 316 L dissimilar joint using BNi-2 filler metal

Due to the distinct differences in physical and metallurgical properties, it is hard to join titanium alloys to stainless steels directly via conventional welding processes. In this research, the grade 5 titanium alloy was subjected to brazing with austenitic stainless steel through the vacuum furnace, and the process was conducted above the β transition temperature (BTT). In order to reduce brittle intermetallic formation, a nickel base filler metal (Ni-6.6Cr-4.5Si-3B) was employed under a vacuum condition, and the effect of time on the microstructure and mechanical properties of the joints was investigated. The brazing temperature led to the thickening of the interface to 400 µm, toward the titanium alloy, and the FeTi formed adjacent to the diffusion affected zone (DAZ). Moreover, the isothermal solidified zone (ISZ) widened during the whole process, which, led to higher dissolution of the titanium base metal in the ISZ. Because of the widening of the interfaces, there were no Ni-rich compounds or residual filler metal in this region. SEM result showed that TiB strengthening borides, which were distributed after 45 min, and this evolution caused an increase in the shear strength of the joint up to 67 MPa. Fractography analyses and XRD results of the fractured surfaces revealed that the Ti2Ni phase, which formed in the athermaly solidified zone (ASZ) during a two-step solidification reaction, caused the brittle fracture in all joints.

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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
期刊最新文献
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