Abstract
Rolling contact fatigue was investigated by sphere-plane contact fatigue machine developed in this study for WC-cermet sprayed materials prepared by HVOF. The fatigue strength strongly depended on the spraying conditions, i.e. three levels of gas pressures, due to the different fatigue mechanisms. When the gas pressure was high, the coating has higher hardness and contact fatigue strength. The contact fatigue strength was evaluated by measuring groove widths of contact region during the fatigue tests.
