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Intermetallic phase formation during brazing of a nickel alloy using a Ni–Cr–Si–Fe–B quinary filler alloy

Ghasemi, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1080/13621718.2018.1553280
  3. Publisher: Taylor and Francis Ltd , 2019
  4. Abstract:
  5. Fundamental understanding of the intermetallic phase formation is the key for enhancing the robustness and reliability of the brazed joints. The paper addresses the phase transformations during brazing of the Hastelloy X nickel-base superalloy using the quinary Ni–13Cr–4.5Si–4.2Fe–2.8B (wt-%) braze alloy. The mechanisms of intermetallic formation via solidification and solid-state precipitation are discussed. The athermal solidification zone (ASZ) is featured by the formation of brittle and hard borides and boro-silicides that are formed via eutectic reactions. However, in contrast to other commercial B-bearing Ni-based filler alloys, it was identified that the presence of a high-volume fraction of eutectic gamma solid solution between boride phases within the joint centreline can alleviate the deleterious effect of the intermetallic phases on the joint toughness. © 2018, © 2018 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute
  6. Keywords:
  7. Brazing ; Hastelloy X ; Intermetallic ; Nickel-base superalloy ; Solid-state precipitation ; Borides ; Eutectics ; Fillers ; Intermetallics ; Precipitation (chemical) ; Silicides ; Solidification ; Superalloys ; Deleterious effects ; High volume fraction ; Intermetallic formation ; Intermetallic phase ; Intermetallic phasis ; Nickel base superalloy ; Solid state precipitation ; Nickel alloys
  8. Source: Science and Technology of Welding and Joining ; Volume 24, Issue 4 , 2019 , Pages 342-351 ; 13621718 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/13621718.2018.1553280?journalCode=ystw20