Effect of Dilution on Wear Performance of Plasma Transferred Arc Deposited Layers

Abstract

The effect of dilution on the wear behavior of PTA (Plasma Transferred Arc) Inconel 625, Inconel 718, and Stellite 6 overlays on Nimonic 80A substrate were investigated. In order to evaluate the wear performance, two-body and three-body abrasive wear tests, and pin-on-disk dry sliding wear test were performed. Microstructural development during the solidification of deposits is also discussed. Wear test results show that the wear rate of deposits with 30% dilution is higher than that of deposits with 10% dilution by around 10%. The sliding wear resistance of overlay deposits follows a similar trend to the abrasive wear resistance. The wear rate of pins for the pin-on-disk dry sliding wear testing is increased as the applied stress is increased. However, the wear rate of pins initially increases sharply with increasing the sliding speed, then stabilizes with further increase in sliding speed at around 0.84 m/s. Cross sectional examinations of the worn surface of pin specimens implies that the plastic deformation near worn surface has occurred during the wear testing.