抄録
Dry slip-rolling contact wear testing and wet slip-rolling contact fatigue testing of several austempered cast irons with various graphite shapes were performed using a Nishihara-type testing machine, and the influences of the graphite shape on the wear and fatigue characteristics of cast iron were investigated. Changing graphite shape from spheroidal to flake was found to result in increasing wear loss in both dry and wet conditions. The lower the graphite nodularity is, the earlier a large amount of wear loss takes place. This is because a lower graphite nodularity results in a shorter average matrix distance between graphites and also a larger stress concentration factor at graphite tips. The pitting phenomenon is easier to occur in samples with a lower graphite nodularity.
