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732 results on '"SHVETS, V. I."'

1. PECULIARITIES OF FRACTURE OF WELDED JOINTS OF RAILWAY RAILS OF OXYGEN-CONVERTER K76F STEEL.

Author

Shvets, V. I., Ziakhor, I. V., Kapitanchuk, L. M., Didkovskyi, O. V., and Antipin, E. V.

Subjects
WELDED joints, IRON clusters, FERRIC oxide, IRON oxides, STEEL
Abstract

The fracture surface of rail K76F steel after static bending tests of rail butt joints produced by flash-butt welding was studied. Butt joints of rails of individual batches were fractured on the base metal or heat-affected zone (HAZ). It is shown that in the regions of dark colour and oval shape, the fracture on the iron oxide film takes place. The formation of films occurs as a result of melting and distribution of iron oxide inclusions along the structural boundaries probably in the thermo-deformation conditions of the crimping shop at the stage of blooming production. The formation of clusters of iron oxides occurs during the crystallization of the residual melt in steel ingots with an insufficient degree of deoxidation. Oval regions of dark colour on the fracture surface are evidence of an insufficient degree of deoxidation of rail steel and a factor of its quality reduction. [ABSTRACT FROM AUTHOR]

Published
2024
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14. FEATURES OF FORMATION AND TRANSFORMATION OF OXIDES IN FLASH-BUTT WELDING OF K76F RAILS.

Author

Shvets, V. I., Ziakhor, I. V., and Kapitanchuk, L. M.

Subjects
WELDING, SILICON oxide, FRACTOGRAPHY, OXIDES, FERROMANGANESE
Abstract

The transformation of oxide inclusions in flash-butt welding (FBW) of K76F rails was studied with the use of the Auger-microprobe JAMP 9500f of JEOL company (Japan) with the X-ray energy dispersion spectrometer Inca penta fet x3 mounted on it and involvement of the most informative methodologies of fractographic analysis. It is shown that high-temperature oxide inclusions without changing the aggregate state are removed as a flash. On the basis of silicon oxides on a molten surface in the welding process, easy fusible ferromanganese and in the near-contact layer -- manganese silicates are formed. The heterogeneity of silicon distribution is the cause of formation of clusters of silicates and formation of "matt spots" in the near-contact layer. [ABSTRACT FROM AUTHOR]

Published
2023
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26. Цукровий діабет, як фактор нейродегенарації Альцгеймерівського типу (огляд літератури)

Author

Tymofiychuk, I. R., Gordienko, V. V., and Shvets, V. I.

Subjects
цукровий діабет, болезнь Альцгеймера, хвороба Альцгеймера, сахарный диабет, diabetes mellitus, neurodegeneration, нейродегенерация, Alzheimer's disease, нейродегенерація
Abstract

Alzheimer's disease (AD) represents a severe neurodegenerative disease which leads to a loss of memory, morbed cognitive disorders and inevitable death. The end result of the pathological process is a mass destruction of neurons in specific structures of the brain which are connected with the preservation and processing of information. The parameter of the spread of AD grows with age. Diabetes mellitus (DM), is considered to be a process which can be similar to accelerated ageing – in case of this disease a propensity to degenerative conditions grows. In recent years data have been received to the effect that diabetes may become a cause of accelerated brain aging., Болезнь Альцгеймера (БА) представляет собой тяжелое нейродегенеративное заболевание, которое приводит к потере памяти, выраженым когнитивным расстройствам и неминуемой гибели. Конечным результатом патологического процесса является массовая гибель нейронов в специфических участках мозга, которые связаны с сохранением и переработкой информации. Показатель распространения БА возрастает с возрастом. Сахарный диабет (СД) считается процессом, который может быть аналогичным ускоренному старению – при этом заболевании возрастает склонность к дегенеративным состояниям. В последние годы получены данные, что диабет может стать причиной ускоренного старения мозга., Хвороба Альцгеймера (ХА) представляє собою тяжке нейродегенеративне захворювання, яке призводить до втрати пам´яті, вираженим когнітивним розладам і неминучої смерті. Кінцевим результатом розвитку патологічного процесу є масова загибель нейронів у специфічних структурах мозку, які пов’язані зі зберіганням і переробкою інформації. Показник розповсюдження ХА зростає з віком. Цукровий діабет (ЦД) вважається процесом, який може бути аналогічним до прискореного старіння - при цьому захворюванні зростає схильність до дегенеративних станів. В останні роки отримано дані, що діабет може стати причиною прискореного старіння мозку.

Published
2021

31. STUDIES OF STRUCTURAL FEATURES OF JOINTS OF RAILS OF R260MN GRADE IN FLASH-BUTT WELDING.

Author

Shvets, V. I., Didkovskyi, O. V., Zyakhor, I. V., Antipin, E. V., and Kapitanchuk, L. M.

Subjects
WELDING, MICROSTRUCTURE, STEEL, MANGANESE
Abstract

The properties and features of the microstructure of joints of the rail steel of R260MN grade with an elevated content of manganese produced by flash-butt welding with pulsating flashing were investigated. The formation of martensitic-austenitic structures due to non-uniform distribution of austenitic stabilizing manganese is shown. A number and sizes of isolated martensitic-austenitic structures is insignificant and does not critically affect the joint test results. The control of the segregation inhomogeneity of manganese is achieved by improving the metallurgical process. [ABSTRACT FROM AUTHOR]

Published
2023
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