Кафедра теорії, технології та автоматизації металургійних процесів (ДМетІ НФ)
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ENG: Department of Theory, Technology and Automation of Metallurgical Processes
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Browsing Кафедра теорії, технології та автоматизації металургійних процесів (ДМетІ НФ) by Author "Balakin, Valerii F."
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Item Accelerated Transport of Substances During Severe Plastic Deformation(Printing House “Technologija”, Kaunas, Lithuania, 2024) Balakin, Valerii F.; Beygelzimer, Y.; Davydenko, O.; Kyryliuk, S.; Kitranov, D.; Havryliak, V.ENG: The Severe Plastic Deformation (SPD) of the powder mixture is studied using the High Pressure Torsion method. Using the example of a mixture of aluminum, titanium and carbon powders, it is shown that SPD leads to accelerated mass transfer, which is expressed in an increase in the effective diffusion coefficient by more than 6 orders of magnitude. A hypothesis regarding the physical causes of this effect is put forward and substantiatedItem Determination of Residual Stresses in the Production of Welded Pipes by Magnetic Memory(НМетАУ, Дніпро, 2023) Savkyn, S. V.; Balakin, Valerii F.ENG: The article proposes the use of the metal magnetic memory method for the purpose of detecting and measuring residual stresses in welded seams and heat-affected zones of longitudinal welded pipes. The experimental study was divided into the following stages: measurement of residual stresses in the weld section of a pipe that has not undergone heat treatment; measurement of residual stresses in the weld section of the heat-treated pipe; analysis of the results obtained. The measurements were carried out in the cross section of the samples, which made it possible to obtain data on the residual stresses contained in the weld, the near-weld zone and the base metal of the pipe. The study confirmed the feasibility of using the metal magnetic memory method to measure residual stresses in welded pipes for further development and modernization of the technological process for the production of longitudinal welded pipes.Item Experimental Study on the Influence of Vibrational Processing in the Course of Ballistic Testing of Metal Plates(Printing House “Technologija”, Kaunas, Lithuania, 2024) Havryliak, V. R.; Sviridov, S. O.; Balakin, Valerii F.; Balakhanova, T. V.ENG: The continuous increase in requirements for armored materials necessitates not only the development of new materials but also the enhancement of the resilience of traditional ones. An analysis of existing data identified a positive effect of vibrational processing on the level of residual stresses in materials, and also revealed the impact of plate deviation along coordinate axes on its ballistic characteristics. This work investigated the effect of vibrational processing on the ballistic properties of 30CrNi2Mo grade steel plates with a thickness of 6.5 mm. Following the ballistic tests, macro- and microstructural examinations of the samples were conducted, along with measurements of microhardness. The feasibility of vibration application was confirmed experimentally. It was determined that without the application of vibration, 100% of the studied samples failed the tests, resulting in a hole at the point of impact. More than 50% of the samples, which were subjected to vibration at frequencies of 10 and 20 Hz during the ballistic tests, were not destroyed. A dent formed at the point of impact. It is shown that the application of vibration significantly enhances the ballistic characteristics of 30CrNi2Mo grade steel plates. The characteristics of the bullet impact traces depend on the vibration frequency. No correlation with the amplitude of oscillation was found at this stage of the work. Analysis of the holes formed during the ballistic tests showed an increase in the plastic component during perforation. Metallographic studies revealed bright lines in the structure of the samples, which in their characteristics are similar to adiabatic shear bands. The use of vibration facilitates the deformation of the bullet, changes the morphology of perforation/deformation, which is confirmed by metallographic analysis.Item Improvement of the Process of Piercing Workpieces on the Horizontal Hydraulic Press of the Pilgrim Unit(ProConferenceOrg in conjunction with Sergeieva&Co, Karlsruhe, Germany, 2024) Balakin, Valerii F.; Garmashov, D. Yu.; Ugryumov, D. Yu.; Ugryumov, Yu. D.; Nykolaienko, Yuliia М.UKR: Метою цієї роботи є розробка нової технології прошивки заготовок (зливків) круглого поперечного перерізу на горизонтальному гідравлічному пресі пілігримового агрегату ПАТ "Інтерпайп НТЗ" для зниження поперечної різностінності одержаних стаканів. Відмінними рисами нової технології є: використання зливка стаціонарного розливання круглого поперечного перерізу з конічним потовщенням з боку донної частини та застосування нового калібрування прошивного інструменту. Виконані дослідні прокатки труб з використанням нової технології прошивки заготовки на горизонтальному пресі зусиллям 20 МН показали, що за рахунок поліпшення центрування зливка в матриці суттєво знижується різностінність, що дозволяє зменшити витратний коефіцієнт металу на 2-3%. Наведено рекомендації щодо використання нової технології для прошивки стаканів на пресі з безперервно-литої заготовки круглого поперечного перерізу.Item Improving the Corrosion Resistance of Hot-Rolled Steel Pipes(Sergeieva&Co, Karlsruhe, Germany, 2023) Bohdan, D. A.; Balakin, Valerii F.; Balakhanova, T. V.; Kuznetsov, Yevhen V.; Nykolayenko, Yuliia М.ENG: Purpose. Substantiation of the use of surface plastic and dynamic surface deformation (SPD, DSD) combined with anticorrosion inhibitory treatment of general-purpose carbon steel pipes to increase wear resistance of pipelines. Methodology. Samples of hot-formed steel taken from test pipe fragments were subjected to various modes of surface plastic and dynamic surface deformation using corrosion inhibitors. Plastic deformation was carried out with a brush tool with different values of brush pressing against the pipe and processing time. Studies of the protective ability of inhibitors were carried out by an accelerated method with periodic moisture condensation according to DSTU ISO 6270-2:2015. A comparative metallographic study of the metal structure of pipes subjected to PPD and DPD with inhibitors was carried out. Results. The results of experimental studies of the surface corrosion resistance and metallographic structure of 139x5 mm pipes made of steel grade 20 using three types of inhibitors and various modes of dynamic plastic deformation are presented. Scientific novelty. The dynamic surface deformation of metal, which refines its grain structure, creates conditions for formation of "penetration channels" for the inhibitor into the metal structure. The use of DPD makes it possible to reduce the grain size in the surface layer, which suggests possibility of controlling the depth of the inhibitor penetration and, as a result, the corrosion resistance of pipes, depending on the operational requirements. Practical value. It has been established that the use of dynamic surface deformation in combination with a certain inhibitor makes it possible to increase the corrosion resistance by 11–19 times.Item Local High Pressure Torsion: A Process for Creating Targeted Heterogeneities in Metallic Materials(Springer Nature, 2025) Beygelzimer, E.; Davydenko, O.; Beygelzimer, Y.; Tereshchenko, Y.; Bondarchuk, V.; Shyvaniuk, V.; Fataiev, R.; Shapiro, I.; Balakin, Valerii F.; Biba, N.; Orlov, D.ENG: In the light of recent developments in the design of structural materials, micro-architected heterogenous-structure metals are considered among most structurally efficient. In this work, a new technique for Local High Pressure Torsion (L-HPT) enabling the creation of heterogeneous structures through localised deformation processing in sheet metals by impeding a rotating punch is proposed. Using AA5083 aluminium alloy as an example, we show experimentally that the rotation of the punch sets adjacent material layers in motion. This results in more than two-fold increase in material hardness over initial level in the workpiece bulk with rather sharp gradients in hardness level transition. The maximum hardness is observed at the peripheral edge of a punch tip. Finite-element modelling of the L-HPT process confirmed that the rotational flow of workpiece material leads to the accumulation of shear strain. The level of accumulated strain increases with an increase in friction at the contact surface. Further analysis based on dimensionality theory revealed that for such an L-HPT configuration the level of equivalent strain is directly proportional to the ratio of rotation-to-translation speeds at the punch.