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RESEARCH PAPERS

Porosity Associated With Insoluble Carbides in VIM-VAR AISI M-50 Steel and Its Probable Effects on Rolling Contact Fatigue

[+] Author and Article Information
F. A. Butterfield

U.S. Navy, Philadelphia Naval Shipyard, Philadelphia, Pa.

T. R. McNelley

Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA

J. Tribol 108(3), 352-357 (Jul 01, 1986) (6 pages) doi:10.1115/1.3261198 History: Received February 14, 1985; Online October 29, 2009

Abstract

The influence on the heat treatment response and rolling contact fatigue behavior of thermomechanical processing (TMP) to refine grain and soluble carbide size was studied for VIM-VAR AISI M-50 steel. Material was processed by warm rolling and then given a final, hardening heat treatment. As-received material was also given the same final heat treatments to provide a comparison. Rolling contact fatigue testing indicates equivalence of the as-received (spheroidize-annealed) and TMP specimens evaluated. This is believed to result from inability of this TMP to refine insoluble carbides and also to the presence of porosity in both as-received and also the processed material. The porosity consists of voids at the ends of the insoluble carbides and does not appear to have been reported heretofore.

Copyright © 1986 by ASME
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