Abstract
Today a lot of attention paid to the resources problem. At present, for deep oil extraction sucker-rod pumps are used in the oil industry, the parts of which are undergo a surface treatment - nitriding. One of the major disadvantages of the ion nitriding method is the long process time. Therefore, a method of ion nitriding with hollow cathode effect (HCE) of the inlet surface of the downhole pump cylinder, that allows to reduce the machining time and increases the quality of diffusion layer, is offered in this article. The microstructure of the nitride layer, the microhardness and its profile through the diffusion layer of the sample of constructional steel 38KhMYuA were obtained and studied. It was proved that ion nit riding with HCE of the constructional steel 38KhMYuA leads to increasing of thickness of the diffusion layer up to 3 times comparing to ion nitriding without HCE. In this work it is also established that with increasing of nitriding time with HCE of steel samples 38KhMYuA microhardness distribution and thickness of the diffusion layer becomes smoother without abrupt transitions to the core. The study of the influence of the ion nitriding process time on the thickness of the diffusion layer showed that the diffusion saturation process during ion nitriding with HCE obeys the inverse parabolic law as any diffusion process. Simultaneously, the rate of diffusion saturation decreases with time. Thus, the application of HCE during the ion nitriding of friction parts of sucker-rod pump is very relevant and promising.
Published Version
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