Until recently, relatively little work had been done in defining the wear behavior of the more common materials of construction used in power plants. Although the phenomena of self-welding and galling have been experienced on bearing surfaces of various equipment components, insufficient data is generally available to define the effects of load and environmental variables on material combinations of interest. The need for accurate wear information has become more prevalent as increasing emphasis is placed on system reliability. This is particularly true in nuclear plants utilizing liquid sodium coolants.

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