Abstract
Abstract The tribomechanical behavior of AISI 8620 steel treated by different plasma-aided processes was investigated. In this study, we compared conventional plasma nitriding (CPN), pulsed plasma nitriding (PPN), plasma nitrocarburized (PNC), plasma oxynitriding (PON), and low-temperature plasma blued (LTPB). The microstructure of treated samples was characterized using X-ray diffraction, and the compound layer thickness was measured by optical microscopy. Vickers microhardness profiles were correlated with a reduction of friction coefficient in the treated samples. Wear test was performed on a pin-on-disc tribometer in dry-sliding conditions using a counter-face of WC-Co ball. Wear tracks on the ball and surface of the treated sample was analyzed with optical micrographs. LTPB process shows the best reduction of the friction coefficient of the amorphous carbon layer on the top of the surface.
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