Brazing of Ni-based single crystal superalloy with high carbon content γ layer

[Display omitted] •The recast layer of Ni-based single crystal superalloy after EDM was characterized.•The negative influences of the recast layer in the tensile strength of brazed joint were discussed.•Inhibition of these negative influences by the aging process has been confirmed. The recast layer...

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Bibliographic Details
Published in:Applied surface science 2020-06, Vol.514, p.145936, Article 145936
Main Authors: Zhou, Xingwen, Huang, Yongde, Chen, Yuhua, Li, Shuhan, Guo, Wei, Peng, Peng
Format: Article
Language:English
Subjects:
Brazing
Carbo-borides
Nickel-base superalloy
Recast layer
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Summary:[Display omitted] •The recast layer of Ni-based single crystal superalloy after EDM was characterized.•The negative influences of the recast layer in the tensile strength of brazed joint were discussed.•Inhibition of these negative influences by the aging process has been confirmed. The recast layer is an undesirable surface residue after the electric discharge machining of materials, which would affect the following brazing process and cause microstructure and property degradation. In this study, the effects of the recast layer composed of carbon-containing γ solid solution on the microstructure and mechanical properties of Ni-based single crystal superalloy were investigated. After brazing, the formation of carbo-borides, borides, and Kirkendall voids near the joint interface could be eliminated via the aging process to recovery the microstructure and property.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2020.145936