Moreau, L.E.; Banoth, S.; Ishida, A.; Murakami, H. Effect of Re Addition on Microstructure and Oxidation Resistance of Co-Cr-Ta-Ti-C Alloys. Coatings2024, 14, 26.
Moreau, L.E.; Banoth, S.; Ishida, A.; Murakami, H. Effect of Re Addition on Microstructure and Oxidation Resistance of Co-Cr-Ta-Ti-C Alloys. Coatings 2024, 14, 26.
Moreau, L.E.; Banoth, S.; Ishida, A.; Murakami, H. Effect of Re Addition on Microstructure and Oxidation Resistance of Co-Cr-Ta-Ti-C Alloys. Coatings2024, 14, 26.
Moreau, L.E.; Banoth, S.; Ishida, A.; Murakami, H. Effect of Re Addition on Microstructure and Oxidation Resistance of Co-Cr-Ta-Ti-C Alloys. Coatings 2024, 14, 26.
Abstract
This study investigates the effect of Re addition on the microstructure evolution and oxidation resistance of Co-Cr-Ta-Ti-C alloys. The alloys tested in this study consist 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 change drastically 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 excessive Re content could lead to deterioration in oxidation resistance, mainly due to the accelerated formation of volatile Re oxides.
Keywords
Co-Cr alloys; phase constitution; differential thermal analysis; Calphad simulation; high temperature oxidation
Subject
Chemistry and Materials Science, Metals, Alloys and Metallurgy
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
