Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7988622 | Intermetallics | 2014 | 10 Pages |
Abstract
A polycrystalline hot working ingot metallurgy processing route for γ/γⲠCo-Al-W superalloys has been developed. Based on Co-7Al-7W (at%), substitutions of Mo, V, Ti, Ta, Ni, Si, Fe and Cr were examined. The γⲠsolvus was found to follow the same trends as those exhibited by alloys with higher γⲠfractions considered by other investigators. Excessive Cr additions were found to lead to discontinuous coarsening and eventually, the loss of the γⲠphase from the microstructures observed. Ni additions were examined, with some success, and found to restore the γⲠphase and raise the solvus temperature. It was found that the addition of 13 at.% Cr improved the oxidation resistance at 800 °C by over 40 times.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
H.-Y. Yan, V.A. Vorontsov, D. Dye,