Application of chemical-thermal treatment for hardening of sprayed with supersonic coatings

In the global economy there is a significant increase in the scale of traffic, the implementation of which directly depends on the quality of transport equipment. Therefore, the work considers new technologies for hardening by modifying the working surfaces of parts of transport machines. The most effective ion-beam nitriding and thermodiffusion carbonitriding were selected for the modification of sputtered steel coatings. Experiments have shown that as the temperature of the nitriding process increases, the depth of the modified layer increases, and the microhardness of the layer also increases. The main phases are nitrides. The increased wear resistance of the nitrided layer is revealed. Carbonation leads to the formation of a modified layer with a thickness of 150-200 gm and a microhardness of 6500-7000 MPa. The main phase is carbonitrides. To regulate the depth and hardness of the layer, the technology of nitrocarburization has been changed by increasing the temperature and changing the composition of the medium. High adhesion strength was obtained. (C) 2019 The Authors. Published by Elsevier B.V.