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Effects of cobalt on structure, microchemistry and properties of a wrought nickel-base superalloyThe effect of cobalt on the basic mechanical properties and microstructure of wrought nickel-base superalloys has been investigated experimentally by systematically replacing cobalt by nickel in Udimet 700 (17 wt% Co) commonly used in gas turbine (jet engine) applications. It is shown that the room temperature tensile yield strength and tensile strength only slightly decrease in fine-grained (disk) alloys and are basically unaffected in coarse-grained (blading) alloys as cobalt is removed. Creep and stress rupture resistances at 760 C are found to be unaffected by cobalt level in the blading alloys and decrease sharply only when the cobalt level is reduced below 8 vol% in the disk alloys. The effect of cobalt is explained in terms of gamma prime strengthening kinetics.
Document ID
Document Type
Reprint (Version printed in journal)
Jarrett, R. N.
Tien, J. K.
(Columbia University New York, NY, United States)
Date Acquired
August 10, 2013
Publication Date
June 1, 1982
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 13A
Subject Category
Metallic Materials
Funding Number(s)
Distribution Limits
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