Sliding wear of graphite crystallized chromium white cast iron

The effects of sliding velocity, heat-treatment and graphite shape on slidi ng wear of graphite crystallized chromium white cast iron were studied. Two types of graphite crystallized chromium white cast irons having flaky or s pheroidal and another type of 2.6C-15Cr white cast iron were prepared for t his study. The effect of sliding velocity on wear resistance was studied by the Okoshi type and pin-on-disk type wear tests on materials which have ex perienced "as cast" and "heat-treated" conditions. The Okoshi type wear tes t results are divided into two relationships depending on sliding velocity or distance. Two regimes, initial wear and steady-state wear, existed for w ear loss and sliding distance. A characteristic form of wear curve with a p eak and a minimum was obtained when correlating wear loss and sliding veloc ity. The wear resistance of graphite crystallized chromium white cast irons were superior to that of 2.6C-15Cr white cast iron. In the results of pin- on-disk tests, there was no clear difference in the reported wear loss and friction coefficient among the alloys. However, an opposite tendency has ap peared in the wear loss and friction coefficient: the wear loss value reach ed a peak in the wear curve at 0.52 m/s, while the friction coefficient rea ched a minimum at 0.52 m/s. (C) 2001 Elsevier Science B.V. All rights reser ved.