Abstract
Duplex surface treatments, combining nitriding and PVD coatings, have been considered as potential solutions to enhance material cavitation erosion resistance. This study investigates 316 L stainless steels after active screen plasma nitriding (ASPN), Ti(AlCu)N coating and duplex-treatment (Duplex) for enhanced cavitation erosion resistance. We elucidate a ‘denitriding - nitriding’ alloying behavior in association with high-energy ion sputtering for the interface between the nitrided case and the Ti(AlCu)N coating in the duplex-treated 316 L surface. Comparing the cavitation erosion performance among ASPN, Ti(AlCu)N and Duplex, the lowest weight loss of the duplex-treated surface is attributable to the enhanced load-bearing capacity from the multilayer system and the strong coating adhesion (HF1) after metallurgical evolution at the interfacial zone.
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