Previously reported studies of the unlubricated sliding of quenched-and-tempered steel pins against similarly treated rings have been supplemented by temperature measurements and tests over a range of loads and speeds. The rate of wear of a pin depends on the hardness of the countersurface; it is shown that the increase in the rate for softer rings is accompanied by a higher temperature in the pin and a rougher wear track on the ring. Attention is thereby drawn towards the conditions in the contact zone, both during running in and when a steady state has been reached. Erratum to this paper appears in 24(4).
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