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Effects of C and Hf concentration on phase relations and microstructure of a wrought powder-metallurgy superalloyNASA IIB-11, a candidate alloy for advanced temperature turbine engine disks, and four modifications with varying C and Hf concentrations were produced from prealloyed powders. Several notable effects of C and Hf concentration in the alloys were observed. Both the amount of the gamma-prime phase and its solvus temperature increased with decreasing C, but only the gamma-prime solvus was affected by Hf, increasing with increasing Hf. Hf also promoted a cellular gamma-prime precipitation. Hf was, however, about equally distributed between gamma-prime and gamma. Hf and C both affected the carbides formed. Increasing both promoted formation of an MC relative to that of an M6C.
Document ID
Document Type
Reprint (Version printed in journal)
Miner, R. V., Jr.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
February 1, 1977
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 8A
Subject Category
Metallic Materials
Accession Number
Distribution Limits

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