Abstract
An investigation of the sliding wear behaviour of a nickelchromiummolybdenum steel under lubricated conditions has been undertaken. After an appropriate running-in procedure that avoids surface roughening, the predominant material-removal mechanism during mild wear is delamination. Surface failure and scuffing under lubricated conditions occur above a transition load of 290 N. The onset of severe wear is associated with adhesive transfer, at which stage delamination and abrasion are also important mechanisms. A layer of plasticity develops immediately below the sliding surface, the thickness of which increases with the applied load. Cracks initiate within this layer, particularly at embedded debris particles, and propagate parallel to the sliding interface to generate delaminated platelets.
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