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Fretting of titanium at temperatures to 650 C in airFretting wear experiments were conducted on high-purity titanium at temperatures up to 650 C. Results indicate that up to about 500 C, the fretting wear increases with temperature. A further increase in the temperature up to 650 C results in decreasing fretting wear. This change in trend of fretting wear with temperature is shown to be associated with a change in oxidation rate. Additional experiments at 650 C showed a transmission from a low rate of fretting wear to a higher rate occurred after exposure to a number of fretting cycles; the number of cycles required to cause this transition was dependent on the normal load. Scanning electron microscopy studies revealed that this transition was marked by cracking and disruption of the surface oxide film. A model was proposed that coupled the oxidation rate kinetics of titanium at 650 C with the occurrence of wear at the surface of the oxide film.
Document ID
19750021177
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Bill, R. C. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1975
Subject Category
Metallic Materials
Report/Patent Number
E-8286
NASA-TN-D-8048
Accession Number
75N29250
Funding Number(s)
PROJECT: RTOP 505-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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