Wear Resistance of 40Сr and 40 СrNi Structural Steels with a Nitrided Layer During Modifying Treatment

The article discusses the results of studies of the wear resistance of structural steels used for the production of shafts of volumetric rotary pumps. A special feature of this type of pump is the extremely small gaps between its working bodies, which are about 10—25 microns and depend on the amount of shaft wear at the junctions with the sliding bearings. Nitriding in glow discharge is the most effective method of ensuring high wear resistance of parts. It is shown that one of the negative phenomena during the wear of the nitrided layer is the formation of abrasive particles as a result of discoloration, which contribute to the caricature of the sleeve surface and, as a result, intensify the wear process. The purpose of the work is to study the wear resistance of steel nitrided in a glow discharge using pretreatment methods of surface plastic deformation, implantation with medium-energy ions, magnetic pulse treatment, as well as combined activation methods. The following activation modes of the surface layer were used before ion nitriding: shot blasting with steel microbeads with a diameter of 50—100 microns at a speed of 30—70 m/s; implantable ions — nitrogen; dose — 1.3·1017 ion/cm2; rate of radiation dose — 1·1015 ion/s; ion implantation energy: 25 keV. Magnetic pulse processing (MPР) with a pulse power from 2 kJ to 8 kJ, its duration from 5 microseconds to 40 microseconds and the number of pulses from 2 MPT to 5 MPT. It is shown that the most effective method of preliminary, before the process of activation of the material of the surface layer of steel is medium-energy ion implantation, which allows to increase the wear resistance of the nitrided layer of 40Cr steel by 5.7 times, and 40 CrNi steel by 4.5 times, compared with conventional ion nitriding.

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