Effect of ion-beam nitriding on structure, phase state, and tribological behavior of efficient thermal spray coatings deposited from various classes of rod steels

Thermal spray coatings produced by the hypersonic spraying of ferritic (Sv-08G2S), martensitic (40Kh13), and austenitic (06Kh19N9T) rod steels and treated by intensive nitrogen ion flows were studied. Metallographic and X-ray diffraction structural analyses of modified coatings were carried out, as well as their microhardness and tribological characteristics were determined. It has been shown that ion-beam treatment leads to an increase in the wear resistance of coatings from the ferritic steel by 2–80 times, those from the martensitic steel by 2–13 times, and those from the austenitic steel by 10–35 times. Based on the results obtained, temperature conditions for ion-beam nitriding that ensure the best tribological characteristics of the coatings deposited from various classes of rod steels have been selected.