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Effects of silicon on the oxidation, hot-corrosion, and mechanical behavior of two cast nickel-base superalloysCast specimens of nickel-base superalloys 713C and Mar-M200 with nominal additions of 0, 0.5, and 1 wt% Si were evaluated for oxidation and corrosion resistance, tensile and stress-rupture properties, microstructure, and phase relations. Results are compared with those of an earlier study of the effects of Si in B-1900. Si had similar effects on all three superalloys. It improves oxidation resistance but the improvement in 713C and Mar-M200 was considerably less than in B-1900. Hot-corrosion resistance is also improved somewhat. Si is, however, detrimental to mechanical properties, in particular, rupture strength and tensile ductility. Si has two obvious microstructural effects. It increases the amount of gamma-prime precipitated in eutectic nodules and promotes a Mo(Ni,Si)2 Laves phase in the alloys containing Mo. These microstructural effects do not appear responsible for the degradation of mechanical properties, however.
Document ID
19780037530
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Miner, R. V., Jr.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
December 1, 1977
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 8A
Subject Category
Metallic Materials
Accession Number
78A21439
Distribution Limits
Public
Copyright
Other

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