Marukovich E.I., Stetsenko V.Y., Stetsenko A.V. About the theory of crystallization of metal melts
It has been shown that the probability of formation of clusters in metal melts, on which the theory of cluster crystallization is based, is zero. The theory of nanostructured crystallization of metal melts has been developed, which is based on their nanostructured structure. According to this theory, the crystallization of metal melts is a nanostructured process, in which the main role is played by elementary nanocrystals of foundry alloy components and structure-forming nanocrystals of phase microcrystals. The main demodulating elements in the crystallization of metal melts are adsorbed oxygen or hydrogen atoms. Modification of casting alloys consists in reduction of concentration of adsorbed oxygen or hydrogen atoms in metal melts. The stability in metal melts of the crystallization centers of phase microcrystals is inversely proportional to the concentrations of oxygen or hydrogen atoms adsorbed on these centers.
Keywords: Theories, cluster crystallization, nanostructured crystallization, metal melts, nanocrystals, modification.

Boldyrev D.A., Davydov S.V. The crystallization process of FeSn intermetallic compound in high-strength tin-containing pearlitic cast iron
Iron foundries are experiencing difficulties due to contamination of steel scrap with waste from high-strength steels microalloyed with carbide-forming elements (Mo, W, Nb, V, Ti, B) and surfactants (surfactants) Cu, Sn, As, Sb. Waste sorting is difficult, as a result, various grades of steels mix uncontrollably. If carbide-forming elements can be useful, then surfactants negatively affect the mechanical and operational properties of cast iron and steel. Sn is used to produce pearlitic cast iron. 0.10…0.15% Sn effectively perlitizes the metal base, however, the effect of Sn on eutectoid transformations and structure formation in cast iron remains a subject of debate. The paper presents an assessment of the Fe-Sn system and experimental data from the Fe-C-Sn system to study the effect of Sn on the over-hardening and brittleness of cast iron.
Keywords: Tin, perlite, high-strength cast iron, intermetallides, microalloying, over-hardening.

Nikitin K.V., Glushenkov V.A., Timoshkin I.Yu., Solomatin D.A. Technical and technological approaches for efficient mixing of melts by electromagnetic pulse fields
The article describes the physical foundations and factors of magnetic pulse action on metal melts. The main attention is paid to possible mixing schemes: external (axial, radial, hybrid), internal, jet, and others, providing the necessary heat and mass transfer in the volume of the metal melt. The features are considered and the effectiveness of each scheme is analyzed in terms of energy consumption and ensuring the required mixing quality. In conclusion, for the first time, a classification of methods of magnetic pulse mixing of a melt is given, which determines the directions of experimental research and their further development in relation to metallurgical and foundry processes.
Keywords: Melt, pulsed magnetic field, mixing, technological schemes, impact factors.

Loginov Yu.N., Stepanov S.I., Muller-Kamskii G.V. Features of assessment of elastic-plastic properties of cellular structures
The increasing role of additive manufacturing in modern industry is noted. In particular, the possibility of manufacturing parts with a high degree of porosity, which are used in medicine, is indicated. The method for determining the elastic-plastic properties of cellular media using compression and recording the stress-stain diagram is analyzed. Experiments are carried out to determine the mechanical properties of a cellular structures made of titanium alloy and their dependences on porosity are obtained.
Keywords: Additive manufacturing, 3D printing, titanium alloys, yield strength, mechanical stresses, deformations.

Kolba A.V., Piiraynen V.Y. White cast iron for cast tools. Part II.
The second part of the article is devoted to the manufacture of cast iron tools, their testing and operational advantages. Information is given on smelting and casting; the effect of melt treatment, crystallization and heat treatment on the properties of tool cast irons. A review of the tests, their results and prospects for the use of cast iron tools is carried out.
Keywords: Cast tools, white cast iron, hydrogen platform, cementite, heat treatment.

Evstigneev A.I., Tkacheva A.V. Evstigneeva A.A., Chernyshova D.V. Crack resistance of ceramic shell molds during calcination and pouring with liquid metal without a support filler
Increasing the crack resistance of shell forms by reducing the stress-strain state in them is the purpose of this work. The article proposes a new technological solution to reduce the failure of ceramic shell molds during non-hot calcination and pouring with liquid metal by reducing the stress-strain state in them. Based on the simulation results, the stresses in the lining and outer layers of the shell during calcination and casting of metal are calculated. A new method of preparing the shell mold for calcination and casting with metal is proposed.
Keywords: Die casting, safety technology, shell molding, crack resistance, calcination, liquid metal casting.

Marukovich E.I., Stetsenko V.Y., Stetsenko A.V. About the theory of crystallization of metal melts

Boldyrev D.A., Davydov S.V. The crystallization process of FeSn intermetallic compound in high-strength tin-containing pearlitic cast iron

Nikitin K.V., Glushenkov V.A., Timoshkin I.Yu., Solomatin D.A. Technical and technological approaches for efficient mixing of melts by electromagnetic pulse fields

Loginov Yu.N., Stepanov S.I., Muller-Kamskii G.V. Features of assessment of elastic-plastic properties of cellular structures

Kolba A.V., Piiraynen V.Y. White cast iron for cast tools. Part II.

Evstigneev A.I., Tkacheva A.V. Evstigneeva A.A., Chernyshova D.V. Crack resistance of ceramic shell molds during calcination and pouring with liquid metal without a support filler