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Synthesis and Characterization of Nanostructured M50 Steel

Published online by Cambridge University Press:  15 February 2011

K. E. Gonsalves ,
S. P. Rangarajan ,
A. Garcia-ruiz  and
C. C. Law
K. E. Gonsalves
Affiliation:
Institute of Materials Science and Department of Chemistry, University of Connecticut, Storrs, CT, 06269.USA.
S. P. Rangarajan
Affiliation:
Institute of Materials Science and Department of Chemistry, University of Connecticut, Storrs, CT, 06269.USA.
C. C. Law
Affiliation:
Pratt & Whitney, East Hartford, CT, 06108.USA.
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Abstract

The synthesis of nanostructured multicomponent (Fe-Mo-Cr-V-C) M50 type steel has been carried out by two chemical routes: the sonochemical decomposition of organometallic precursors and the co-reduction of the respective metal halides. Both methods produce amorphous nanopowders, but the co-reduction method requires an additional heat treatment in vacuum at 700 °C to remove the by-product LiCl. In this paper we describe the synthetic methods and the characterization of the powders by XRD and SEM-EDAX. The powders exhibit a composition very close to that of M50 steel with an average grain size in the nanometer regime. In both cases the powders have been compacted in a vacuum hot press after they were heat treated in hydrogen. The characterization of the compacted specimens by XRD and SEM-EDAX is also discussed. The TEM characterization is presented for the sonochemically produced powders and compacts. A similar characterization of the co-reduced powders and the compacts is in progress. The consolidated specimens are homogeneous and dense, with an average grain size of ∼30 nm. Their hardness is higher as compared with that of the conventional M50 alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 49
Copyright
Copyright © Materials Research Society 1996

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