Effects of silicon on the wear behaviour of cobalt-based alloys at elevated temperature

In this study, are presented and discussed effects of silicon on the abrasive wear behaviour at elevated temperatures of cobalt-based alloys such as Co–28Cr–4W–1.1C–3.2Si, Co–28Cr–4W–1.1C–4.1Si, Co–28Cr–4W–1.1C–5.2Si, respectively. Wear resistance of the materials were measured by a two body pin-on-disk wear tester with SiC and Al2O3 abrasives. The hardness of stellite 6 alloy increased with silicon addition. Wear resistance of stellite 6 with silicon addition has increased at low temperature but, decreased at high temperature. Microstructure of samples has been investigated by optical and SEM techniques.