Increasing the wear resistance of parts of screw pumps and motors by nitriding while suppressing the process of nitride mesh formation

Abstract

The paper considers the technology of nitriding of alloy steel parts, which provides suppression of the formation of a nitride mesh as a result of preliminary preparation of the surface layer by high-energy action. Comparative models of the formation of nitrided layers obtained with traditional and proposed nitriding methods, as well as models of wear under conditions of friction of the surfaces of parts, are proposed. The results of comparative wear tests of nitrided rotors of screw pumps and engines made of alloy steels are presented. It is shown that the absence of a nitride mesh in the nitrided layer increases the wear  resistance of the nitrided layer by about 3–4 times.