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Dissimilar brazing of NbSS/Nb5Si3 composite to GH5188 superalloy using Ni-based filler alloys

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Abstract

In this paper, dissimilar joining of NbSS/Nb5Si3 composites to GH5188 Co-based superalloy was performed by using two commercial Ni-based brazing filler alloys, BNi-2 and BNi-5 fillers. The interfacial microstructures of the brazed joints were investigated by scanning electron microscope equipped with an X-ray energy dispersive spectrometer. Three-point bending test was also conducted. When brazed with BNi-2 filler alloy at 1020°C for 15 min, typical reaction products across the brazing seam could be identified as NiSS, borides, Ni3Si+Nb3Si, and (Nb,Ti)2Ni phase. Due to the physical and chemical mismatch between the dissimilar base materials, some cracks were observable at the NbSS/Nb5Si3 composites side. The joint strength was only 60 MPa. While brazed with BNi-5 filler alloy at 1160°C for 15 min, the interfacial reaction became more sufficient, and the joints exhibited an average bending strength of 272 MPa.

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Funding

This work was financially supported by the Beijing Municipal Science & Technology Commission (No. Z171100002217048) and the National Natural Science Foundation of China (No. 52005465).

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Authors and Affiliations

  1. Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Xinyu Ren, Wenwen Li, Yongjuan Jing, Bo Chen, Shuai Huang & Huaping Xiong

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  1. Xinyu Ren
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  2. Wenwen Li
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  3. Yongjuan Jing
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  4. Bo Chen
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  5. Shuai Huang
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  6. Huaping Xiong
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Correspondence to Huaping Xiong.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Ren, X., Li, W., Jing, Y. et al. Dissimilar brazing of NbSS/Nb5Si3 composite to GH5188 superalloy using Ni-based filler alloys. Weld World 65, 1767–1775 (2021). https://doi.org/10.1007/s40194-021-01148-6

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  • DOI: https://doi.org/10.1007/s40194-021-01148-6

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