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Formation of a rough slag-skull surface and its effect on the thermal resistance of the gap between the ingot shell and the continuous-casting mold wallстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
- Авторы: Lyakishev N.P., Arutyunyan N.A., Zaitsev A.I., Zaitseva N.E., Kalmykov K.B., Leites A.V., Shakhpazov E.Kh
- Журнал: Russian Metallurgy (Metally)
- Том: 2005
- Номер: 3
- Год издания: 2005
- Издательство: Allerton Press Inc.
- Местоположение издательства: United States
- Первая страница: 193
- Последняя страница: 203
- Аннотация: The formation of a rough slag-skull surface from the side of the working wall of a continuous-casting mold has been studied experimentally and theoretically. The rough surface is found to be mainly formed due to the crystallization of slag from its liquid (for high-basicity compositions) or glassy (for low-basicity compositions) state. The crystallization intensity and, hence, the development of the slag-skull surface macrostructure (the development of an air gap between the slag skull and the copper mold wall assimilating heat) depend on the thermal history; the thickness of the forming crystalline layer; the differences in the slag molar volumes in the liquid, glassy, and crystalline states; the glass transition temperature; and the glass crystallization temperature. Therefore, the crystallization intensity and surface roughness can vary over wide limits. To analyze the effect of the slag-skull surface roughness and the appearing air gap on the interfacial thermal resistance and to estimate its role in the heat transfer from the ingot to the mold, we measured the effective thermal conductivity coefficients for two experimental CaO-SiO2-Al2O3-CaF2 slags. The results obtained unambiguously indicate that the interface plays a key role in controlling heat removal in the continuous-casting mold. It is shown that the data on the molar-volume jumps that occur during crystallization from the liquid or glassy states of slag phases and on the glass-forming ability of a melt can be used to precisely predict the slag-skull surface roughness and the thermal resistance to heat transfer from the ingot shell to the mold wall. Principles for designing new systems of slag-forming mixtures are formulated to ensure defectless casting of steels, including medium-carbon surface crack-sensitive steels. Copyright © 2005 by Pleiades Publishing, Inc.
- Добавил в систему: Калмыков Константин Борисович