Sliding wear life and sliding wear mechanism of gray cast iron AISI NO.35B

Wear damage occurs and develops on machine parts that slide because of relative slippage between these parts. If such damage reduces the operating accuracy of the machine, then the machine will ultimately cease to function. In this study, we conducted sliding wear experiments under lubrication using gray cast iron AISI NO.35B (JIS FC250, hereafter termed FC250), which is widely used for machine parts, and studied changes in the sliding wear life and wear amount. From the experimental results thereof, a wear constitutive relation of gray cast iron (i.e., the effects of changes in wear amount and shear stress) was defined and it was shown that seizure life could be derived from the proposed constitutive relation. Furthermore, the wear surface was observed during the sliding wear process, and the sliding wear mechanism of gray cast iron FC250 was clarified on the basis of changes in the size and shape of wear damage occurring over time.