Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia)

N. A. Feoktistov, Cand. Eng., Associate Prof., Head of the Dept. of Foundry production and Material Science, e-mail: fna87@mail.ru

The article presents the research results aimed at studying the influence of the chemical composition and thermal conditions of crystallization on the level of the properties of cast iron and wear-resistant steels, which are used for manufacture of replaceable components of mining industry units as well as metallurgical production facilities. The literature review states that the level of properties of cast products is significantly influenced by both the alloy chemical composition and the thermal conditions of casting formation in the mold. Managing the process of microstructure of cast products formation at the stages of primary and secondary crystallization, it is possible to obtain various parameters of the structures in the cast state of products. The resulting cast structure will determine further the parameters of microstructure after heat treatment, as well as the level of operation and mechanical properties. Experimental castings made of high-manganese steel, hypereutectoid steel and cast iron for rolls were obtained in laboratory conditions. In order to assess the complex influence of ther-mal conditions of formation of the cast products and the alloy chemical composition, experi-mental castings were obtained in casting moulds that are made from materials with different heat storage abilities. Further, the obtained cast products were tested in the conditions of abrasive and shock-abrasive wear. During the metallographic study of structures of experimental castings, quantitative characteristics of microstructures in the form of grain sizes, amount of carbide and graphite phases were determined, and the influence of thermal conditions of formation of the cast product in the mould on these parameters of microstructure was assessed. Moreover, the influence of alloying elements and nitrogen on the structure of the selected casting alloys was evaluated. At the final research stage, the operation and mechanical properties of the obtained castings were studied. The complex influence of chemical composition and thermal conditions of casting formation a casting mould on the level of operation and mechanical properties was established. The concentration intervals, in which the properties of experimental castings have maximal values, were determined.

The research was carried out within the framework of the project of Ural interregional scientific and educational center (UMNOTs) “Advanced production technologies and materials”, the project No. 2022-26.

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