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Elevated temperature properties of aligned ferrous eutecticsIron base alloys containing aluminum and chromium together with smaller amounts of yttrium and silicon are of interest for high temperature applications. Strengthening an inherently weak but oxidation resistant solid solution matrix with aligned in situ chromium carbides represents an attractive approach to achieving both surface stability and creep resistance at elevated temperatures. Aligned microstructures were produced in alloys of approximately 30 wt % (Cr + Mn), about 3 wt % C and the balance Fe consisting of a gamma matrix and the hexagonal carbide (Cr, Mn, Fe)7C3. The tensile and stress rupture strength to 2000 F of aligned Fe-20 w/t % Cr-10 wt % Mn-3.2 wt % C measured parallel to the carbide reinforcement exceeded those of the strongest iron-nickel superalloys, e.g., CRM-6D developed by Chrysler for automotive turbine application. The cyclic oxidation and sulfidation response of these alloys at elevated temperatures can be markedly improved by aluminum additions.
Document ID
19830003035
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lemkey, F. D.
(United Technologies Research Center East Hartford, CT, United States)
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
83N11305
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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