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Synthesis and Characterization of Nanocrystalline M50 Steel Powders by Cryomilling

Published online by Cambridge University Press:  15 February 2011

M. L. Lau ,
B. Huang ,
R. J. Perez ,
S. R. Nutt  and
E. J. Lavernia
M. L. Lau
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, CA 92717-2575
B. Huang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, CA 92717-2575
R. J. Perez
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, CA 92717-2575
S. R. Nutt
Affiliation:
Department of Materials Science and Engineering, University of Southern California, Los Angeles, CA 90089-0241
E. J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, CA 92717-2575
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Abstract

The present study investigated the synthesis of nanocrystalline high speed steel M50 (4.5% Mo, 4.0% Cr, 1.0% V, 0.8% C, balance Fe) by cryogenic high energy ball milling (cryomilling). Pre-alloyed M50 steel was spray atomized, and subsequently cryomilled in liquid nitrogen for 25 hours. Elemental Al powder was added prior to cryomilling in order to promote the formation of nanoscale Al2O3 and AlN particles, which improved the thermal stability of the nanocrystalline M50 steel. Following annealing at 1373 K, the M50 steel was found to retain its nanocrystalline microstructure with the average grain size of 40–80 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 43
Copyright
Copyright © Materials Research Society 1996

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