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This study investigated the effect of Re addition on the microstructural evolution and oxidation resistance of Co-Cr-Ta-Ti-C alloys. The alloys tested in this study consisted of a Co-rich matrix with mixed HCP and FCC phases, together with TaTiC2- and Ti-based carbides. The addition of Re promotes the precipitation and growth of a CoCr-rich σ-phase. Differential thermal analysis (DTA) showed that the melting temperatures did not drastically change up to 10 at% Re addition, whereas 15 at% Re addition significantly increased the melting temperature of the alloys. Oxidation tests in air at 1200 °C showed that an excessive Re content could lead to a deterioration in oxidation re-sistance, mainly due to the accelerated formation of volatile Re oxides.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Co-Cr alloys, phase constitution, differential thermal analysis, Calphad simulation, high-temperature oxidation

Date published: 2023-12-25

Publisher: MDPI AG

Journal:

• Coatings (ISSN: 20796412) vol. 14 issue. 1 26

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/coatings14010026

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Updated at: 2024-10-09 08:30:53 +0900

Published on MDR: 2024-10-09 08:30:53 +0900