Fretting Wear Properties of Inconel 690 Alloy at Elevated Temperature

The fretting test was carried out using an SRVⅣ fretting test rig in order to investigate the fretting behavior and damage mechanism of Inconel 690 alloy at elevated temperatures. The results indicate that the friction coefficient and wear decreased with increasing temperature. It is found that fretting characteristic transformed from gross sliding to partial sliding at temperature of 270℃. At room temperature, delamination was dominant wear. With increase of temperature nucleation and propagation of fatigue crack gradually played a dominant role. Friction oxidation mainly occurred in sliding zone of wear scar, while there was negligible oxidation in adhesion zone. At partial slip region, the microcracks were usually found in the junction zone of slide zone and adhesion zone. At room temperature, delamination appeared easily, however, the formation of compacted oxide layer at high temperature was easier than that at room temperature.