Interfacial microstructures and corrosion behavior of tungsten heavy alloy/superalloy dissimilar joints: design, regulation and mechanism

The interfacial microstructures and corrosion behavior of tungsten heavy alloy/superalloy dissimilar joints brazed with various Cu–Ti based multicomponent amorphous alloys were investigated by time-varying chemical bath immersion tests and electrochemical measurements. The longitudinal analysis of c...

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Bibliographic Details
Published in:Journal of materials research and technology 2023-07, Vol.25, p.6323-6337
Main Authors: Xu, Yuxin, Qiu, Xiaoming, Wang, Suyu, Chen, Chuantong, Xing, Fei, Suganuma, Katsuaki
Format: Article
Language:English
Subjects:
Brazing
Corrosion mechanism
Interfaces
Pitting corrosion
Superalloy
Tungsten heavy alloy (WHA)
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Summary:The interfacial microstructures and corrosion behavior of tungsten heavy alloy/superalloy dissimilar joints brazed with various Cu–Ti based multicomponent amorphous alloys were investigated by time-varying chemical bath immersion tests and electrochemical measurements. The longitudinal analysis of corrosion behavior differences in different regions of dissimilar joints was conducted, and the horizontal analysis of the influence of compositional variation in filler materials on corrosion behavior was investigated. Importantly, the brazed joint with CuTiNiZrV filler material (CT3 joint) exhibited the noblest Ecorr (−0.911 VSCE) and the highest charge transfer resistance (1610.5 Ω cm2). From the compositional and microstructural effects on the corrosion resistance, the enhancing anti-corrosion performance was mainly attributed to the tailoring of the microstructures and corrosion potential of the brazing seam, and the formation of protective compact oxide film (Fe2O3-NiO-CoO-VO).
ISSN:2238-7854
DOI:10.1016/j.jmrt.2023.07.094