Hot Wear of a Haynes 282^® Superalloy

The high-temperature wear behavior of a Haynes 282^® superalloy was studied at 625 °C in pin-on-roll sliding tests with a load of 68 N for 7.5 km using pins of the alloy in heat-treated (T) and wrought (W) conditions. Specific wear rate plots as a function of the sliding distance indicate that wear was more significant for up to 3.8 km for heat-treated specimens (T); however, wear of the alloys in both metallurgical conditions gave similar values, which did not increase from 5.0 km onwards. Characterization of the wear mechanisms suggests that metallic wear was present, expressed as the plastic deformation at the surface and subsurface regions of the alloys in both conditions. Oxidational wear was also found, which was more important for the W alloy. Nevertheless, the mixture of oxides and metallic particles favored the formation of tribofilms that reduced friction and prevented further wear. Tribofilms were also developed on the surface of the counter rolls, and particles from them were transferred to the surface of the nickel alloy pins by adhesion.