The modified technology for strengthening the surface layer of low-carbon steel for machine components by electroplasma processing is proposed. This technology is to be used as an alternative ...carburizing method with subsequent hardening. The developed technology of strengthening by the proposed method is based on the author’s invention. The parameters of this process are given, resulting in a thickness of the reinforced surface layer of 1000 µm to 1700 µm. An increase in microhardness of 1.5 to 2 times (compared to the initial state) was observed. With hardening, chemical modification of the material’s surface layer occurs. The microstructure of the treated surface of the steel samples is characterised by a dark modified surface layer: a fine needle-like structure of martensitic origin under the dark layer transforms into an initial perlite-ferritic structure. The advantage of strengthening based on the electrolytic plasma processing consists of low energy consumption at high hardening speeds and the possibility of local processing of surface areas, especially large parts of complex shapes. In addition, the proposed surface treatment method using electrolytic plasma processing (EPP) not only achieves a smooth surface but also improves the service qualities of the components, specifically wear resistance.
t. For the Kazakhstan railway, the current issue is the rich reserves of natural resources of Kazakhstan and the annual increase in diesel fuel prices, the use of liquefied natural gas as fuel in ...railway rolling stock to reduce the high rates of harmful substances released from exhaust gases when consuming diesel fuel. The article substantiates the prospects and possibilities of using liquefied natural gas as an alternative fuel for locomotives as engines. The magnitude of the consequences is investigated with the analysis of the share of gas emissions into the environment for various types of fuel. With the analysis of foreign experience in using gas as an additional fuel, the advantages of combustion and environmental indicators of gas fuel were studied, the use for locomotives was justified. It has been established that the use of liquefied natural g as as an additive to diesel fuel has a positive effect on the performance of diesel engines.
