Abstract
The severe wear of cast iron has been examined over a range of sliding speeds from 50 to 400 cm s −1 using a pin-on-ring configuration. Pin specimens consisted of two series of flake graphite cast irons with carefully controlled variation in either flake size or carbon content, but all having the same pearlitic matrix structure. A major aspect of the investigation involved detailed metallographic studies of the deformation at the wear surface using taper sectioning and scanning electron microscopy techniques, leading to the identification of characteristic mechanisms of severe wear. Fracture was observed either within the heavily deformed surface layers or as linkage of cracks between graphite flakes in the underlying matrix. The carbon content and flake size were significant in determining both the nature and the rate of severe wear; these effects have been interpreted in terms of a more basic parameter termed the interflake distance.
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