MICROHETEROGENITY OF LIQUID STEEL 12CR18NI9TI

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Abstract

The microheterogeneity of liquid steel of 12Cr18Ni9Ti grade, as a complex alloy, was understood as a local inhomogeneity in the elemental composition. Anomalous behavior in the temperature dependence of the kinematic viscosity and electrical resistivity of the melt was attributed to the presence of these microheterogeneity. Temperature dependences of the kinematic viscosities and electrical resistivities of 12Cr18Ni9Ti steel samples, in the liquid state, were measured at various stages of the technological cycle. Measurements were conducted in both heating and subsequent cooling modes, over a temperature range of 1400–1730°C. It was observed that the temperature dependencies of the kinematic viscosity obtained in heating and cooling modes coincided over the entire temperature range. However, a difference in the volume per structural unit of viscous flow was noted for all the studied samples. The minimum volume value of the viscous flow structural unit (υ) was obtained for a sample taken after the addition of ferromanganese and titanium. There was a discrepancy in the temperature dependence of the electrical resistivity of the melt, obtained in the heating and cooling mode, which was accompanied by a decrease in the thermal coefficient of electrical resistivity for all samples studied. The largest decrease in the temperature coefficient of electrical resistivity was observed for the sample containing ferromanganese and titanium, indicating a maximum increase in free volume of the melt and, consequently, an increase in the distance between adjacent atoms. It is worth noting that this sample had the highest degree of supercooling during crystallization. The results obtained suggest that the introduction of a new technological step, which involves reloading the furnace and adding titanium after the first discharge, can lead to an improvement in the homogeneity of the molten metal and a potential decrease in the quality of the finished products. Based on these findings, recommendations have been made regarding the preparation of the molten steel for casting and solidification. In order to ensure the highest possible quality of cast products made from 12Cr18Ni9Ti steel, it is recommended to limit the casting process to the first melt, without reloading the furnace or adding titanium.

About the authors

D. P. Shvetsov

Ural Federal University named after the first President of Russia B.N. Yeltsin; LLC «Tsentr Tochnogo Lit’ya»

Email: n.i.sinitsin@urfu.ru
Ekaterinburg, Russia; Ekaterinburg, Russia

V. S. Tsepelev

Ural Federal University named after the first President of Russia B.N. Yeltsin

Email: n.i.sinitsin@urfu.ru
Ekaterinburg, Russia

N. I. Sinitsin

Ural Federal University named after the first President of Russia B.N. Yeltsin

Email: n.i.sinitsin@urfu.ru
Ekaterinburg, Russia

O. A. Chikova

Ural Federal University named after the first President of Russia B.N. Yeltsin

Email: n.i.sinitsin@urfu.ru
Ekaterinburg, Russia

V. V. Vyukhin

Ural Federal University named after the first President of Russia B.N. Yeltsin

Author for correspondence.
Email: n.i.sinitsin@urfu.ru
Ekaterinburg, Russia

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