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Friction and oxidative wear of 440C ball bearing steels under high load and extreme bulk temperaturesUnlubricated sliding friction and wear of 440C steels in an oxygen environment have been studied under a variety of load, speed, and temperature ranging from approximately -185 to 675 deg C. A specially designed test apparatus with a ball-on-flat geometry has been used for this purpose. The observed dependencies of the initial coefficient of friction, the average dynamic coefficient of friction, and the wear rate on load, speed, and test temperatures have been examined from the standpoint of existing theories of friction and wear. High contact temperatures are generated during the sliding friction, causing rapid oxidation and localized surface melting. A combination of fatigue, delamination, and loss of hardness due to tempering of the martensitic structure is responsible for the high wear rate observed and the coefficient of friction.
Document ID
19930042982
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chaudhuri, Dilip K.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Slifka, Andrew J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Siegwarth, James D.
(NIST Boulder, CO, United States)
Date Acquired
August 16, 2013
Publication Date
January 2, 1993
Publication Information
Publication: Wear
Volume: 160
Issue: 1
ISSN: 0043-1648
Subject Category
Metallic Materials
Accession Number
93A26979
Funding Number(s)
CONTRACT_GRANT: NASA ORDER H-01026-D
Distribution Limits
Public
Copyright
Other

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