Abstract
A polycrystalline hot working ingot metallurgy processing route for γ/γ′ Co-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 γ′ solvus was found to follow the same trends as those exhibited by alloys with higher γ′ fractions considered by other investigators. Excessive Cr additions were found to lead to discontinuous coarsening and eventually, the loss of the γ′ phase from the microstructures observed. Ni additions were examined, with some success, and found to restore the γ′ phase 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.
| Language | English |
|---|---|
| Pages | 44-53 |
| Number of pages | 10 |
| Journal | Intermetallics |
| Volume | 48 |
| DOIs | |
| Publication status | Published - 1 May 2014 |
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Keywords
- aluminides
- oxidation
- phase diagrams
- precipitates
- miscellaneous
- polycrystalline hot working ingot metallurgy
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Alloying effects in polycrystalline γ′ strengthened Co-Al-W base alloys. / Yan, H. Y.; Vorontsov, V. A.; Dye, D.
In: Intermetallics, Vol. 48, 01.05.2014, p. 44-53.Research output: Contribution to journal › Article
TY - JOUR
T1 - Alloying effects in polycrystalline γ′ strengthened Co-Al-W base alloys
AU - Yan, H. Y.
AU - Vorontsov, V. A.
AU - Dye, D.
PY - 2014/5/1
Y1 - 2014/5/1
N2 - A polycrystalline hot working ingot metallurgy processing route for γ/γ′ Co-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 γ′ solvus was found to follow the same trends as those exhibited by alloys with higher γ′ fractions considered by other investigators. Excessive Cr additions were found to lead to discontinuous coarsening and eventually, the loss of the γ′ phase from the microstructures observed. Ni additions were examined, with some success, and found to restore the γ′ phase 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.
AB - A polycrystalline hot working ingot metallurgy processing route for γ/γ′ Co-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 γ′ solvus was found to follow the same trends as those exhibited by alloys with higher γ′ fractions considered by other investigators. Excessive Cr additions were found to lead to discontinuous coarsening and eventually, the loss of the γ′ phase from the microstructures observed. Ni additions were examined, with some success, and found to restore the γ′ phase 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.
KW - aluminides
KW - oxidation
KW - phase diagrams
KW - precipitates
KW - miscellaneous
KW - polycrystalline hot working ingot metallurgy
UR - http://www.scopus.com/inward/record.url?scp=84897610275&partnerID=8YFLogxK
U2 - 10.1016/j.intermet.2013.10.022
DO - 10.1016/j.intermet.2013.10.022
M3 - Article
VL - 48
SP - 44
EP - 53
JO - Intermetallics
T2 - Intermetallics
JF - Intermetallics
SN - 0966-9795
ER -