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Information × Registration Number 0223U000339, 0120U101186 , R & D reports Title Investigation of the features of chemical inhomogeneity formation in carbon steels (0.4 - 0.6% wt. C) and its hereditary influence on the microstructure and mechanical properties of metal products of railway purpose popup.stage_title Head Babachenko Oleksandr I., Доктор технічних наук Registration Date 06-01-2023 Organization Iron and Steel Institute of Z.I.Nekrasov National Academy of Sciences of Ukraine popup.description2  It was established that the influence of the cooling rate during solidification of the analyzed blanks on the size of dendritic crystals is described by an inversely proportional relationship: y=k·х-n. It was determined that when the metal cooling rate during solidification changes from 1 to 106℃/min, the size of the dendrites decreases by ~8 times. At the same time, the density of the dendritic structure of carbon steels decreases by ~60 times, and the nature of its dependence on the intensity of heat removal is the reverse of the change in the size of the dendrites. The nature of the distribution of chemical elements - silicon and manganese - in the dendritic structure during the hardening of carbon steels in the range of cooling rates from 1 to 106℃/min was established. It is shown that the maximum content of silicon and manganese is characteristic of former spaces between dendritic branches of the 1st order, their minimum content is for former dendritic branches. At the same time, the number of these elements in microvolumes of steel, which are former spaces between dendritic branches of the 2nd order, is on average 50% more than in former dendritic branches. It was determined that during post-crystallization cooling of carbon steels ~ 0.4...0.6% by weight. in the interval 10-2 – 1 ℃/sec, the change in the average size of austenite grains (the size of the real steel grain) is described by a polynomial dependence of the second degree: y = – A x2 + B x + C. When the cooling rate changes by two orders of magnitude, the difference in the average size of the former austenite grains grains is ~1.5 times. It was determined that when choosing the optimal chemical composition of steel for the manufacture of important parts for railway purposes, it is necessary to take into account the method of steel production, raw materials and technological features of the metallurgical enterprise, since steel of even close chemical composition can have a different nature of structur Product Description popup.authors Babachenko Oleksandr І. Bahrova Yuliia Balakhanova Tetiana V. Budnyk Zoia Dmytrivna Dementieva Zhanna A. Domina Katerina G. Zhyzhko Kateryna Kimstach Tetiana V. Klynova Olha P. Kovzel' Maksim A. Kononenko Hanna A. Podolskyi Rostyslav Prokopenko Pavlo Hryhorovych Puchykov Oleksandr V Reshetova Maryna Viktorivna Safronov Oleksandr Safronova Olena A Sukhyi Andrii Topol Serhii Uzlov Oleg V. Filonenko Nataliia Yu. Chernenko Valeriia Shvetz Lyudmyla I. Shpak Olena A. popup.nrat_date 2023-01-06 Close