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The Quaternary System Fe-Cr-Mn-C and Aligned Ferrous Superalloys

Published online by Cambridge University Press:  15 February 2011

F. D. Lemkey ,
E. R. Thompson ,
J. C. Schuster  and
H. Nowotny
F. D. Lemkey
Affiliation:
United Technologies Research Center, East Hartford, CT 06108
E. R. Thompson
Affiliation:
United Technologies Research Center, East Hartford, CT 06108
J. C. Schuster
Affiliation:
Institute of Physical Chemistry,University of Vienna, Austria
H. Nowotny
Affiliation:
University of Connecticut, Storrs, CT 06268
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Abstract

A challenge exists for wider application of low cost iron-base alloys in the extreme conditions of high temperature, hot corrosion, and high stress experienced in gas turbine engines. In response to this challenge the constitution of the quaternary, Fe-Cr-Mn-C, and to a lesser extent the quinary, Fe-Cr-Mn-Al-C, systems were examined for in situ composite alloy candidates. Multivariant eutectic compositions, determined from phase equilibria, were directionally solidified to produce aligned composites consisting of M7C3 carbides within a gamma iron matrix. The composition and lattice parameters of the carbide and matrix phases were determined to establish their respective stabilities. Stress rupture tests in the direction of phase alignment for certain compositions (e.g., Fe-20 wt% Cr-lO wt% Mn-3.2 wt% C) indicated strength values comparable to cast nickel-base superalloys and exceeded those of the strongest iron-nickel superalloys developed for automotive turbines. Results of cyclic sulfidation testing at 9000 indicated a balance of Cr and Al content to be important to the achievement of outstanding surface stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 12: Symposium L – In Situ Composites IV , 1981 , 31
Copyright
Copyright © Materials Research Society 1982

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