Physical and Chemical Geotechnologies

Abstract

In this work, we study the steel specimens after continuous casting with different contents of carbon, manganese and silicon, cooled at rates in the range from 106 °C/min up to 1 °C / min. We used microstructural, X-ray diffraction analyses and X-ray microanalysis to determine the structural state of the alloys. It is shown that when cooling at a rate of 106 ºC/ min in the surface zone there is suppression of δ-iron formation and formation of γ-iron dendrites from the melt. It is determined that the coefficient of dendritic liquation of silicon remains constant and is 1.7; the coefficient for manganese varies slightly from 2.26 in the surface layers to 2.34 in the central layers. As it is revealed, depending on the location zone, martensite is formed in steel specimens, and in certain areas bainite and perlite are formed. In addition, complex carbides are found in the steel structure – Fe0,4 Mn3,6 C, Fe2,7 Mn3C, FeSiC,, as well as phases – Fe2MnSi, Fe5 Si3 та Fe0,68 Mn6,4 Si2. In the paper we calculate the liquidus temperature of steels by two methods and show that the outcomes are in good agreement. It is shown for the first time that the inhibition of formation of the primary phase during crystallization of steels can be obtained at high cooling rates or as a result of overheating of steels.

Keywords: continuous casting of steels, alloying with manganese and silicon, liquidus temperature, suppression of primary phases

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