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Eutectic equilibria in the quaternary system Fe-Cr-Mn-CThe constitution of the quaternary system, Fe-Cr-Mn-C and to a lesser extent of the quinary system, Fe-Cr-Mn-Al-C were examined for in situ composite alloy candidates. Multivariant eutectic compositions were determined from phase equilibria studies wherein M7C3 carbides (approximately 30% by volume) formed from the melt within gamma iron. An extended field of the hexagonal carbide, (Cr, Fe, Mn)7 C3, was found without undergoing transformation to the orthorhombic structure. Increasing stability for this carbide was found for higher ratios of Cr/Fe(+) Cr + Mn. Aluminum additions promoted a ferritic matrix while manganese favored the desired gamma austenitic matrix. In coexistence with the matrix phase, chromium enters preferentially the carbide phase while manganese distributes equally between the gamma matrix and the M7C3 carbide. The composition and lattice parameters of the carbide and matrix phases were determined to establish their respective stabilities.
Document ID
19830003034
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nowotny, H.
(Connecticut Univ. Storrs, CT, United States)
Wayne, S.
(Connecticut Univ. Storrs, CT, United States)
Schuster, J. C.
(Vienna Univ.)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Publication Information
Publication: NASA. Lewis Research Center COSAM (Conserv. of Strategic Aerospace Mater.) Program Overview
Subject Category
Metallic Materials
Accession Number
83N11304
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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