Tulepova M.A., Kvon S.S., Okishev K.Yu. Influence of cooling rate on carbide formation in high-chromium cast irons
The study investigates the effect of cooling rate on the microstructure and properties of alloyed high-chromium cast iron grade ChKh16. The ChKh16 cast iron was additionally alloyed with niobium, titanium, and vanadium to achieve a total content of approximately 1.5 wt.% in the final alloy. The experimental alloy was cast into different molds-metallic, shell, and sand-clay-which provided varying cooling rates. The structure, hardness, and wear resistance of the resulting samples were examined. It was found that the highest hardness and wear resistance were exhibited by samples cast in sand-clay molds, i.e., those with the lowest cooling rate.
Keywords: High-chromium cast iron, carbide-forming elements, microstructure, cooling rate, hardness, wear resistance.

Marukovich E.I., Stetsenko V.Y., Stetsenko A.V. Crystallization of high-carbon manganese steel
Crystallization of high-carbon manganese steel (HMS) is a nanostructured process in which nanocrystals of iron, graphite, silicon and manganese play a major role. In the crystallization of HMS, the oxygen, nitrogen and hydrogen atoms in its melt are demodifying elements that reduce the dispersion of austenite microcrystals. Molecular hydrogen and nitrogen prevent the dendrites from branching, which leads to demodification of the structure. Hydrogen, oxygen and nitrogen atoms do not form solid interstitial solutions with iron and manganese nanocrystals. Modifying elements of the HMS reduce the concentration of oxygen and hydrogen atoms in its melt. The centers of crystallization of the HMS are nanostructured austenite formations.
Keywords: High-carbon manganese steel, crystallization, nanocrystals, hydrogen, oxygen, nitrogen, austenite.

Malinov L.S., Malinov V.L., Gavrilova V.G. The ambiguous effect of heat treatment modes of high-carbon steels with metastable austenite on their wear resistance
The ambiguous effect of heat treatment modes on the wear resistance of high-carbon medium-manganese steels with metastable austenite on their wear resistance under various abrasive conditions characterized by the coefficient of dynamicity (Cd) is shown. To achieve their highest level of stability, it is necessary to control the stability of austenite, optimizing it in relation to the development of dynamic deformation martensitic transformation (DDMT (self-hardening effect under loading-SHL). To do this, it is necessary to regulate the temperature and exposure time of austenitization during quenching and heating modes after it.
Keywords: Steel, metastable austenite, wear resistance, self-hardening effect under loading, heat treatment modes.

Bazhin V.Yu., Makushin D.V., Tran Duc Hieu Control of the chemical composition of continuous cast alloy 8xxx aluminum l
This work proposes a scheme for real-time control of the chemical composition through parallel sampling for express analysis directly from the gating system and during the trimming of the cast strip edges after it exits the gap of the cooling rolls and is wound into coils. An assessment was conducted on the feasibility of using the Thermo-Calc software package to calculate the temperature of the polymorphic (?+?) > ? transformation (Ttt), taking into account deviations in chemical composition for the aluminum alloy of the Al-Fe-Si-Mn system. This will enable adjustments to the chemical composition in the mixer in response to deviations from the specified content values of alloying and modifying elements.
Keywords: Sheet billet, non-bloom rolling, high-alloy aluminum alloys, chemical composition control, automation, casting and rolling.

Gruzman V.M. Problems of digitalization of foundry production
The results of determining the variance of reproducibility of a production database depending on its volume are presented. It is shown that in the production of large-scale mass casting, in order to reduce the variance of reproducibility and, consequently, to increase the accuracy of technological indicators, the volume of the database should not be maximum, but optimal. It is proposed to regulate not only the standard physical and mechanical properties of mixtures, but also their production range, in order to digitalize foundry production.
Keywords: Digitalization, data volume, specificity, knowledge base, number of mixings of the molding sand mixture, reproducibility variance, model parameter, significance.

Lazarenkov A.M., Sadokha M.A. Working conditions of workers in foundries with serial production
A methodology for assessing the actual state of working conditions of workers in foundries during workplace certification based on the hygienic classification of working conditions is presented. The results of the assessment of working conditions at the workplaces of the main professions of various sections of foundries with the serial nature of production are presented, which made it possible to determine the classes of working conditions of employees and benefits for working in these conditions. Based on the results and analysis of the research data, recommendations were formulated to improve working conditions and reduce their impact on foundry workers.
Keywords: Foundry, nature of production, workplace, profession, factors of the production environment, working conditions, measures to improve working conditions.

Tulepova M.A., Kvon S.S., Okishev K.Yu. Influence of cooling rate on carbide formation in high-chromium cast irons

Marukovich E.I., Stetsenko V.Y., Stetsenko A.V. Crystallization of high-carbon manganese steel

Malinov L.S., Malinov V.L., Gavrilova V.G. The ambiguous effect of heat treatment modes of high-carbon steels with metastable austenite on their wear resistance

Bazhin V.Yu., Makushin D.V., Tran Duc Hieu Control of the chemical composition of continuous cast alloy 8xxx aluminum l

Gruzman V.M. Problems of digitalization of foundry production

Lazarenkov A.M., Sadokha M.A. Working conditions of workers in foundries with serial production