Navoi State Mining and Technological University (Navoi, Uzbekistan):

A. A. Zhumaev, Dr. Eng., Associate Prof., e-mail: ahmadjon_jumayev@mail.ru

Kh. I. Akhmedov, Cand. Eng., Associate Prof.

Tashkent State Transport University (Tashkent, Uzbekistan):
Yu. N. Mansurov, Dr. Eng., Professor, e-mail: yulbarsmans@gmail.com

Abylkas Saginov Karaganda Technical University (Karaganda, Kazakhstan):

V. Yu. Kulikov, Cand. Eng., Professor

The hardness and microstructure of ICh280Kh29NL and ICh330Kh17L grades cast iron, the most common for the manufacture of parts of mining and metallurgical equipment operating under wear conditions, have been studied. The thermodynamic analysis of multicomponent Fe–2,6C–Cr–AE systems in order to study the processes of crystallization of alloys, the formation of the structure of the metal base in them, as well as the formation and transformation of carbide phases has been carried out. Based on the analysis, the optimal amount and ratio of alloying elements (Cr, Mn, Si and Ti) in the Fe–2.6C–Cr–AE system, necessary for the formation of a metal matrix and a carbide phase, which provide the maximum hardness of the alloy, was determined. State diagrams of three-, four- and multi-component systems such as Fe–C–Cr, Fe–C–Ni, Fe–C–Mn, Fe–C–V, Fe–C–Mo, Fe–C–Co, Fe–C–Cr–Ni, Fe–C–Cr–Mn, Fe–C–Cr–Mn, their iso- (at a temperature of 200 °C) and polythermal sections, which made it possible to enrich the theory of state diagrams - the basis of cast irons in the range of chromium concentrations (from 16 to 34 % ), nickel (0.4 to 3 %), manganese (0.4 to 2 %), carbon (2.4 to 4 %), silicon (0.3 to 2 %), titanium (0 .4 to 5 %), molybdenum (from 0.2 to 3 %), vanadium (from 0.01 to 2 %). Phase equilibrium points, including alloyed iron-based solid solution, multicomponent carbides, a mixture of phases based on ironbased solid solution and carbides have been determined. An economical grade of wear-resistant white cast iron with the following composition: carbon 3.2–3.4 %, manganese 0.4–0.6 %, chromium 16–18 %, silicon 0.4–0.6 %, nickel 0.4–0.6 %, molybdenum up to 0.4–0.5 %, the balance is iron, has been created.
The authors of the article express their gratitude to N. O. Korotkova (NUST MISIS) for her help in conducting research in terms of electron microscopy, the results of which are used in this article.

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