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55th anniversary of department “Technology of Materials” of Volgograd State Technical University
ArticleName Study of features of cast metal structure of ingots with different geometry used for obtaining round bars
ArticleAuthor N. А. Zyuban, D. V. Rutskiy, S. B. Gamanyuk, M. V. Kirilichev
ArticleAuthorData

Volgograd State Technical University (Volgograd, Russia):

N. A. Zyuban, Dr. Eng., Prof., Head of the Dept “Technology of Materials”, e-mail: tecmat@vstu.ru
D. V. Rutskiy, Cand. Eng., Associate Prof.
S. B. Gamanyuk, Cand. Eng., Associate Prof.
M. V. Kirilichev, Post-Graduate

Abstract

In the work of computer simulation of the solidification of the ingot, the geometry of a 5.9-ton reverse taper ingot with a small amount of the hot top used to produce round rolled metal was proposed. The selected geometry makes it possible to obtain a structure in the solidified metal with a favorable arrangement of physical and chemical inhomogeneities of the cast metal. Calculation of temperature fields, which showed that in the proposed ingot, 1 h 45 min after the start of solidification, the advancing crystallization front closes and a long "closed" zone of liquid metal is formed, the height of which is 37% of the ingot body height. The data presented are consistent with real shrinkage defects, the length of which was 36% of the ingot body height. Comparison of the calculation of the temperature distribution field with the determination of the parameters of the cast structure showed that in the upper part of the ingot the distances between the secondary axes of the dendrites are maximum, which is associated with improved thermal performance of the hot top, which reduces the intensity of solidification and creates favorable conditions for the segregation of impurities, (С, S, P) and the transfer of non-metallic inclusions from the top of the ingot to the hot top. The use of reverse taper ingot with a small amount of the hot top leads to a decrease in waste from the hot-top and to obtain high-quality round rolled metal.
The work has been executed with support of the Russian Foundation for Basic Research, project No. 18-08\00050.

keywords Solidification, modeling, temperature field, straight taper ingot, reverse taper ingot, non-metallic inclusions, shrinkage, segregation, round rolled metal
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