The article is devoted to the study of corrosion resistance and wear resistance (sliding friction) of unhardened and glow discharge nitrided (ion or ion-plasma nitriding) structural steels 20, 45, 45X and 38X2МЮА in distilled water. The influence of temperature (T = 793 – 873 K), the composition of the saturating mixture (nitrogen N2, argon Ar and propane C3H8) and its pressure (Р = 80 – 450 Pa), the duration of the process on the structure and phase composition of the nitrided layers was studied (carried out using metallographic and X-ray structural analyses). A comparison of the physical and mechanical characteristics of the surface layer of unhardened and nitrided steels before and after the tests was carried out and it was concluded that nitrided steels have an increased service life due to greater hardness, corrosion resistance and wear resistance. It is recommended to increase the corrosion resistance of the studied steels in distilled water, to carry out their ionic nitriding in a nitrogen-containing atmosphere, and to increase wear resistance - in a carbon-containing atmosphere (carbonitriding).
The study is devoted to the substantiation of the basic components of the mechanism of regulation of social and labor relations in the united territorial communities of Ukraine. The article analyzes the research on the role of the state and local governments in regulating and developing social and labor relations at the local level. The leading world concepts in regulating social and labor relations have been characterized. The purpose and role of local self- government bodies in regulating social and labor relations have been defined. The basic scientific approaches to the concept of “community development” have been investigated. Based on the research, the basic components of the mechanisms of regulation of social and labor relations in the united territorial communities have been identified and their characteristics have been given.
The article highlights the results of experimental research of the wear resistance of different structures of steels with different thermal and chemical-thermal treatment in corrosive and abrasive medium on special friction machines that modelled the working conditions of the extrudes when processing feed grain with the additives of saponite. Comparative study showed that metal wear resistance in corrosive and abrasive medium at higher temperatures depends not only on the hardness of friction surface, but also on its structure, phase composition and hardness of gradient change in the depth of the hardened layer. To provide extruder's high wear resistance when manufacturing feed grain mixed fodder with the additives of saponite it is recommended to make the details of extruding assembly unit of steel 5 that is strengthened by nitrohardening.
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