NDLI: A New Polycrystalline Co-Ni Superalloy

Content Provider	Springer Nature Link
Author	Knop, M. Mulvey, P. Ismail, F. Radecka, A. Rahman, K. M. Lindley, T. C. Shollock, B. A. Hardy, M. C. Moody, M. P. Martin, T. L. Bagot, P. A. J. Dye, D.
Copyright Year	2014
Abstract	In 2006, a new-ordered L1$_{2}$ phase, Co$_{3}$(Al,W), was discovered that can form coherently in a face-centered cubic (fcc) A1 Co matrix. Since then, a community has developed that is attempting to take these alloys forward into practical applications in gas turbines. A new candidate polycrystalline Co-Ni γ/γ′ superalloy, V208C, is presented that has the nominal composition 36Co-35Ni-15Cr-10Al-3W-1Ta (at.%). The alloy was produced by conventional powder metallurgy superalloy methods. After forging, a γ′ fraction of ~56% and a secondary γ′ size of 88 nm were obtained, with a grain size of 2.5 μm. The solvus temperature was 1000°C. The density was found to be 8.52 g cm$^{−3}$, which is similar to existing Ni alloys with this level of γ′. The alloy showed the flow stress anomaly and a yield strength of 920 MPa at room temperature and 820 MPa at 800°C, similar to that of Mar-M247. These values are significantly higher than those found for either conventional solution and carbide-strengthened Co alloys or the γ/γ′ Co superalloys presented in the literature thus far. The oxidation resistance, with a mass gain of 0.08 mg cm$^{−2}$ in 100 h at 800°C, is also comparable with that of existing high-temperature Ni superalloys. These results suggest that Co-based and Co-Ni superalloys may hold some promise for the future in gas turbine applications.
Starting Page	2495
Ending Page	2501
Page Count	7
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	66
Issue Number	12
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2014-10-17
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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