Production of Castings with Differentiated Surface Properties
Problems. Surface layers get the most intensive external influences during the operation of molded parts of machines and mechanisms, therefore their structure and properties determine the operability of products as a whole. To achieve high surface strength and durability of parts, various technological processes are used in the industry, but most of them do not make it possible to obtain a surface layer with the desired properties of the required thickness. In this case, more promising can be the technological process of surface alloying (the manufacture of products with differentiated surface properties).
Objective. The aim of the paper is to develop a technological process for the production of castings with specified surface properties.
Methods. Each core was coated with an alloying coating, coated cores were dried in the air during the day, the mold and cores were heated and collected just before pouring them with metal.
Results. It is necessary to use ferromanganese, ferrotitanium and ferrochrome for the manufacture of wear-resistant parts, which allow obtaining on the casting surface an alloyed layer with a thickness up to12 mm and hardness up to 68 NRA. Such process parameters fully meet the operational requirements for products that operate under abrasive or water abrasion wear.Conclusions. To increase the hardness of the working surfaces, certain chemical elements, ferroalloys and chemical compounds such as carbides, borides and nitrides can be used as fillers of alloying coatings.
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