Abstract
The dry sliding wear of flake and spheroidal graphite cast irons was studied as a function of sliding surface temperatures. The average temperature of the real areas of contact between the sliding surfaces (the flash temperature) and the mean temperature of the apparent sliding surface (the mean temperature) were considered. Wear tests were performed in air and vacuum on a pin-on-disc machine by rubbing various types of cast iron on Constantan, nickel and 17Cr stainless steel, and the flash temperature was measured by the dynamic thermo-electromotive force method. Variations of wear with sliding speed and applied load are explained in terms of the flash temperature and the mean temperature. When the mean temperature is below 400 °C wear reaches a maximum at a flash temperature of 300–400 °C and then decreases with further increase in flash temperature. Wear is low below 250 °C and is independent of sliding conditions such as speed, load, ambient temperature and atmospheric pressure. However, when the flash temperature approaches the melting point the wear depends strongly on the mean temperature and reaches a minimum when the mean temperature is below 400 °C. Seizure occurs with high wear if the mean temperature exceeds 400 °C.
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