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Synthesis and Processing of Nanograined Fe - (Fe, Mo)6C Composite Powders

Published online by Cambridge University Press:  15 February 2011

R. K. Sadangi ,
B. H. Kear  and
L. E. McCandlish
R. K. Sadangi
Affiliation:
Department of Mechanics and Materials Science Rutgers- The State University of New Jersey, Piscataway, New Jersey 08855-0909
B. H. Kear
Affiliation:
Department of Mechanics and Materials Science Rutgers- The State University of New Jersey, Piscataway, New Jersey 08855-0909
L. E. McCandlish
Affiliation:
Nanodyne Incorporated, 19 Home News Row, New Brunswick, New Jersey 08901
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Abstract

Spray Conversion Processing was used to synthesize high volume fractions (0.52 - 0.74) of nanograined (Fe, Mo)6C carbide dispersions in iron, starting from water soluble precursors. The essential features of the process are, (1) preparation of a chemically homogeneous precursor powder, and (2) thermochemical conversion of the precursor powder to the desired nanostructured composite powder through controlled gas-solid reactions. The thermodynamic and kinetic features of the gas-solid reactions, and the influence of various processing parameters on the structures developed, are discussed. The powders were consolidated to near theoretical density by pressureless sintering and hot pressing. All the consolidated samples had bicontinuous structures. Compared to M2 high speed tool steels, these high volume fraction carbide strengthened iron alloys display superior hardness values up to 500°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 351: Symposium V – Molecularly Designed Ultrafine/Nanostructured Materials , 1994 , 219
Copyright
Copyright © Materials Research Society 1994

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References

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