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Metallology and Metallography
Название Investigation of the distribution and microsegregation of alloying elements in structural low-alloy steels ingots
DOI 10.17580/chm.2023.02.08
Автор M. V. Kirilichev, N. A. Zyuban, D. V. Rutsky, D. S. Tolstykh
Информация об авторе

Volgograd State Technical University, Russia, Volgograd:

M. V. Kirilichev, Cand. Eng., Head of the Laboratory, Dept. of Technology of Materials, e-mail: tecmat@vstu.ru
N. A. Zyuban, Dr. Eng., Prof., Dept. of Technology of Materials, e-mail: tecmat49@vstu.ru
D. V. Rutsky, Cand. Eng., Associate Prof., Head of the Dept. of Technology of Materials, e-mail: drutskii@vstu.ru


National University of Science and Technology "MISiS", Russia, Moscow:
D. S. Tolstykh, Deputy Director of the Advanced Engineering School "Materials Science, Additive and End-to-End Technologies", e-mail: Tolstykh.DS@misis.ru


Abstract: Microsegregation processes are the primary link in the formation of chemical heterogeneity in the volume of blanks. If certain methods and technologies have been developed to control zonal segregation heterogeneity, which can significantly reduce the manifestations of this defect, then in the case of interdendritic segregation, which depends mainly on the chemical composition and crystallization rate, the development of such methods is associated with certain difficulties. In this work, we studied the features of the formation of microsegregation inhomogeneity in laboratory ingots weighing 40 kg of low-carbon low-alloy steels cast under various cooling conditions, and in a vacuum ingot weighing 24.2 tons of steel 38KhN3MFA. It was found that in laboratory ingots, the determining factor affecting microsegregation processes is the initial chemical composition, in particular the sulfur content, an increase in the concentration of which contributes to the activation of microsegregation processes for almost all elements. Changing the temperature conditions of cooling to a greater extent affects the parameters of the structure. In a large ingot, the change in the concentration of elements both in the axes of the dendrites and in the interdendritic spaces is closely related to the features of the formation of the macrostructure. A more stable distribution of elements is observed on the lower horizon of the ingot, which is due to accelerated crystallization processes due to the cooling effect of the massive tray. The change in the structure parameters depends on the geometric dimensions of the ingot; in the zone of columnar crystals, the dendritic parameter has the highest value.
The study was carried out with the financial support of Volgograd State Technical University within the framework of scientific project No. 6/469-22.

Ключевые слова Microsegregation, dendrites, interaxial spaces, chemical composition, micro and macrostructure, melt, crystallization
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