On October 13, 2025, Stanislav Nikolaevich Zhiznyakov, a renowned scientist in the field of welding production, candidate of technical sciences, professor of the Department of Powder Metallurgy, Welding and Materials Technology at the Belarusian National Technical University, turned 90 years old.

November 5, 2025, marked the 75th birthday of Boleslav Mecheslavovich Nemenenko, Doctor of Engineering Sciences, and Professor, Head of the Department of Ferrous and Non-Ferrous Alloys at BNTU.

On November 22, Anatoly Grigorievich Slutsky, a candidate of technical sciences and associate professor in the Department of Ferrous and Non-Ferrous Alloy Metallurgy at the Belarusian National Technical University, turned 75.

The main structural elements of melts of nickel‑chromium, nickel‑aluminum, nickel‑titanium alloys are elementary nanocrystals of nickel, chromium, aluminum, titanium and their free atoms. The main crystallizing phases of nickel alloys are α‑phase and γ‑phase microcrystals. The crystallization process of nickel alloys is nanostructured. First, structure‑forming nanocrystals are formed from elementary nanocrystals and free atoms. Then crystallization centers are formed from them. From these centers, structure‑forming nanocrystals and free atoms, microcrystals of nickel alloys are formed.

A study conducted at the scientific laboratory of ОJSC BELNIILIT examines the feasibility of using spent catalysts from petrochemical plants in the Republic of Belarus as alloying element carriers in the smelting of economically alloyed steels. Chemical analysis revealed significant levels of vanadium, molybdenum, nickel, cobalt, and tungsten in the catalysts. The need for pre‑treat‑ment of the raw materials to remove moisture and neutralize harmful impurities is substantiated for the implementation of a combined resource‑saving technology.

This article presents the results of laboratory studies on iron‑containing waste generated and accumulated as a result of flotation processing of copper smelting slags at the Almalyk Mining and Metallurgical Complex. In addition to analyzing the elemental, phase, and particle size composition of the material, the study explored the possibility of its solid‑state reduction using carbon. The reduction rate at different temperatures and the required ratio of reductant to slag to achieve complete metallization of the iron contained in the slag were determined. The results of the study suggest that copper smelting slags can be considered a promising source of iron‑containing raw material for the production of metallized iron pellets or briquettes for electric steelmaking plants, especially in regions lacking their own iron ore deposits or where such resources are insufficient.

This paper explores opportunities for improving shell core‑making technology using an inorganic binder – liquid sodium silicate – by integrating the advantages of the V‑Process and a sodium silicate‑based core‑making process, which employs primary cellulose or aqueous suspension of pulped cardboard fibers as the principal component of a core molding mixture. A core‑making technology for cellulose‑based, sodium silicate‑bonded shell cores, in which pulped cardboard serves as the cellulose source, has been presented. This technology includes preparatory operations such as milling and swelling of primary cellulose, addition of both water and liquid sodium silicate, shell formation, drying, filling the shell with dry quartz molding sand or a recycled core mixture, sealing, and final drying of a cellulose‑based, sodium silicate‑bonded shell core in a drying oven. The results of experimental research into the physical and technical properties of cellulose‑based, sodium silicate‑bonded shell cores have been demonstrated, and the prospects for industrial application of the proposed core‑making technology have been discussed.

A method for calculating the maximum temperature, heating section length, and heating time of a billet surface at the mold outlet during continuous casting of iron has been developed. The adequacy of the proposed method has been confirmed; based on the obtained results and a comparative analysis, it accurately describes the heating process of a steel ingot at the mold outlet. The method can be recommended for use in calculating the heating process of billets made of various materials during continuous casting.

Modern high‑tech equipment is used for ore crushing – rod mills (dry or wet grinding). Choice of steel for rod production is driven by the need for high strength and wear resistance. Rod mills operate with specific characteristics, as grinding occurs through impact and friction along the linear contact line of the contacting rods. One of the disadvantages of rod mills is the frequent failure of the working rods, especially when grinding wet fractions, which leads to emergency breakdown of the mill. Premature failure of working rods during wet grinding typically occurs due to corrosion. However, not all rods made from the same material are subject to premature corrosive wear. In order to determine cause of premature failure of grinding material, a study was conducted on rods made of steel grade 65G (GOST 14959–2016) that were destroyed during operation.
Visual inspection, determination of chemical composition, and examination of the rod cross‑sectional macrostructure, as well as microstructure of the surface layer in the defect zone and in the rod axial zone were carried out. The cause of corrosion damage to localized surface areas was determined.

Difference in mechanical properties in individual directions is an important problem, which results in the impact on reliability and durability of products made from steel grade 60PP during operation. Anisotropy of mechanical properties can significantly limit the use of steel of the presented grade in critical structures. Understanding the nature of anisotropy and its impact on the performance characteristics of metal products will allow us to develop recommendations for improving the quality of steel products, which is especially important in modern production conditions. This article examines the influence of banding of ferrite‑ pearlite structure on the difference in the actual values of mechanical properties, and presents study of anisotropy of mechanical properties of structural steel grade 60PP in mutually perpendicular directions relative to rolling.

The results of a study examining the effect of ultrasonic vibrations (UT) on the microstructure and anisotropy of steel samples produced by wire-arc additive cladding are presented. UT suppresses the formation of columnar grains and crystallographic texture caused by epitaxial growth from the substrate. X‑ray diffraction analysis confirmed a 1.5–3.0‑fold decrease in the intensity of the (110) α‑Fe reflection without UT, while with UT, the structure approaches isotropic. The results demonstrate the effectiveness of UT control in the WAAM cladding process.

The article presents research results on enhancing the mechanical properties of the cast aluminum alloy AK9 by modification with a complex modifier in the form of an Al – 8 % Sr – 10 % (La + Ce) master alloy. It has been established that the introduction of rare‑earth elements (La, Ce) and Sr contributes to the refinement of all major structural constituents, increasing hardness, tensile strength, and ductility, especially in alloys with elevated iron content. The study demonstrates that the proposed approach expands the application of secondary aluminum alloys in critical engineering components.

The results of scientific research aimed at studying the influence of reaction mechanical alloying conditions on the characteristics of synthesized austenitic steel powder are presented. Conditions ensuring the production of material with a reasonable fraction content of 25–50 µm are determined. The influence of selective laser melting process parameters on the structure and hardness of the synthesized products is studied. The phase composition of the material is determined.

This paper presents computer modeling using various programs, capable of simulating technological processes, and potential loads experienced by model kits based on solid and hollow glued and solid elements. The process of compaction of molding mixtures during machine and manual molding was simulated with a visual demonstration of the loads acting on the model kit. The advantages and disadvantages of the programs used in the Eurasian Economic Community are discussed. The feasibility of using these programs to assess loads on solid and glued components is substantiated.

High‑temperature steel P91 with a high chromium content is used in the production of boiler and steam line elements that operate under steam pressure up to 31 MPa and at temperatures up to 600 °C. However, the increased diffusion creep, which causes the formation of type III or IV cracks in the weldment heat‑affected zone (HAZ), significantly reduces the service life of welded structures made of this steel. One of the causes of crack formation in steam pipelines during operation is the presence of residual tensile stresses after welding. The purpose of the study: to determine the influence of pre‑ and post‑weld heat treatment on residual stresses and deformations during multi‑pass welding of pipe blanks.

The results of a study of emissions of harmful substances from sources of steel foundries with mass production are presented. The sources of emissions and the main harmful substances emitted from the sites of steel foundries are considered. The distribution of the emitted harmful substances from the sources of various sections of steel workshops has been determined. It has been established that the highest concentrations in the emitted volumes are dust, carbon monoxide, nitrogen oxides, phenol, and formaldehyde, the excess concentration of which in the air is noted in the residential area located in the area of the enterprise, and especially in the steel workshops.