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The influence of cobalt on the microstructure of the nickel-base superalloy MAR-M247Nickel was substituted for Co to produce 0, 5, and the standard 10% versions of MAR-M247, a cast nickel-base superalloy. The microstructures of the alloys were examined in as-cast, heat treated, aged, and stress-rupture tested conditions using a variety of metallographic techniques and differential thermal analysis. As cobalt concentration was reduced from 10 to 0 wt %, the gamma-prime weight fraction decreased from 59 to 41%; W and Ti concentrations in the gamma-prime phase increased from 5 to 8 and 2 to 3 at.%, respectively; the mean gamma-prime particle size increased from 0.6 to 0.8 micron; Cr and Al concentrations in the gamma matrix decreased from 17 to 13 and 15 to 12 at.%, respectively; and the weight fraction of carbides increased by approximately 1%.
Document ID
19820063865
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nathal, M. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Maier, R. D.
(Chase Brass and Copper Co. Solon, OH, United States)
Ebert, L. J.
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1982
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 13A
Subject Category
Metallic Materials
Accession Number
82A47400
Funding Number(s)
CONTRACT_GRANT: NSG-330
Distribution Limits
Public
Copyright
Other

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