ННІ "Дніпровський металургійний інститут" (ДМетІ)

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https://crust.ust.edu.ua/handle/123456789/19780
ENG: Dnipro Metallurgical Institute

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Browsing ННІ "Дніпровський металургійний інститут" (ДМетІ) by Author "Aiupova, Tetiana A."

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    08пс Steel Structure and Properties as a Result of Rolling in the Subcritical Temperature Range
    (CPN Publishing Group; Scientific Publishing Center “Sci-conf.com.ua”, 2024) Kotova, Tetiana V.; Nosko, Olha A.; Aiupova, Tetiana A.
    ENG: The 08пс steel structure and properties formation after rolling at subcritical temperatures with air cooling are studied. The development differs in the temperatures of the beginning and end of rolling, as well as the cooling rate in the post-deformation period. It allows to expand theoretical ideas about the patterns of 08пс deformed steel structure formation. The results of the investigation can be applied in determining rational processing modes, which involve rolling at subcritical temperatures, to increase the complex metal properties and obtain high-quality parts by cold stamping.
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    Regulations of the Formation of Bainetic Component Matrix in Economy Alloyed Chromo-Manganese Alloys
    (Prydniprovska State Academy of Civil Engineering and Architecture, Dnipro, 2023) Pohrebna, N. E.; Nosko, O. A.; Aiupova, Tetiana A.; Hrebenieva, А. V.; Aiupov, O. A.
    ENG: Purpose. The purpose of the investigation is to establish the regularities of the kinetics of supercooled austenite decomposition in the bainite temperature range (400−200 °C) in chromium-manganese cast iron for the development of thermal hardening regimes that increase the service life of products. Methodology. The object of the study are samples of research and industrial smelting of chrome-manganese cast iron containing 3,1 % carbon, 13,1 % chromium, and 15,75 % manganese. The study of the supercooled austenite decomposition kinetics was carried out by the dilatometric method in the temperature range of 400−200 °C, the study of the microstructure, phase composition, as well as the measurement of microhardness and hardness was carried out according to standard methods. Scientific novelty. The peculiarities of the supercooled austenite decomposition kinetics in the bainite temperature range (400−200 °С) in chromium-manganese cast iron were determined, the structure of the cast iron after aging consists of eutectic carbides Me (Cr, Mn, Fe)7C3, products of austenite decomposition, secondary carbides Me (Cr, Mn, Fe)7C3, Me (Cr, Mn, Fe)3C, as well as untransformed austenite in the amount of 70...75 %. The maximum hardness of the experimental cast iron was established during isothermal exposure at 350 °C for 35 hours. Practical value. The established regularities of the chromium-manganese cast iron structure formation and the determined and optimized temperature-time intervals of the supercooled austenite isothermal decomposition in cast iron are the basis for the development of heat treatment regimes to increase the strength, wear resistance of the material and the service life of its products.