Enhanced mechanical properties of TZM joint brazed at high temperature using Mo-Ni filler metal with Boron addition

IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Welding in the World Pub Date : 2024-05-15 DOI:10.1007/s40194-024-01783-9

Quanbin Lu, Junlan Huang, Zongye Ding, Dengwen Hu, Gaoming Lu, Weimin Long

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Abstract

Controlling the growth of brittle intermetallic compounds (IMCs) and interfacial structure is crucial to obtaining desirable mechanical properties of the high-temperature brazing joints of titanium-zirconium-molybdenum (TZM) alloy. The effect of B addition on the mechanical properties of the joints and the microstructures in the brazing seam was investigated. The results show that the addition of 1%B enhances significantly the wettability of Mo-45Ni filler metal. The strength of the brazed joint with Mo-45Ni-1B filler metal is 30% higher than that of the joint with Mo-45Ni filler metal. The microstructure of the brazed joint with Mo-45Ni filler metal consisted of TZM/NiMo/eutectic (Mo + NiMo) + NiMo /NiMo/TZM. B addition led to the formation of Mo₂B intermetallic compounds at the interface between NiMo layer and TZM alloy during heating and the precipitation of faceted Mo₂B IMCs in the brazing seam during solidification, promoting the brittle-to-ductile fracture transition. This study provides a deep insight into the HT brazing of TZM alloy.

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使用添加硼的钼-镍填充金属在高温下钎焊 TZM 接头可提高机械性能

控制脆性金属间化合物（IMC）的生长和界面结构是获得钛锆钼（TZM）合金高温钎焊接头理想机械性能的关键。研究了硼添加量对接头机械性能和钎缝微观结构的影响。结果表明，添加 1%B 能显著提高 Mo-45Ni 填充金属的润湿性。使用 Mo-45Ni-1B 填充金属的钎焊接头强度比使用 Mo-45Ni 填充金属的接头强度高 30%。使用 Mo-45Ni 填充金属的钎焊接头的微观结构由 TZM/NiMo/共晶（Mo + NiMo）+ NiMo /NiMo/TZM 组成。在加热过程中，B 的加入导致在 NiMo 层和 TZM 合金的界面上形成 Mo2B 金属间化合物，并在凝固过程中在钎缝中析出刻面 Mo2B IMC，从而促进了从脆性到韧性的断裂转变。这项研究为 TZM 合金的高温钎焊提供了深入的见解。

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来源期刊

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.