| Abstrakt: |
Various research methods show that the microstructure of the complex siliconcontaining modifier "Insteel 7" consists of six phases: TiFeSi2, Ca1-x (La, Ce)xSi2, CaSi2, FeSi2 and a phase based on BaSi2, containing impurities of Ca, Si, Al, and Mg. Silicides of titanium, iron, calcium, and barium in the composition of the modifier due to their low melting points contribute dissolution of Insteel 7 and enhance the effect of the modification when introduced into the liquid metal. In addition, the phases containing rare earth metals can purify the metal from harmful impurities and reduce the content of dissolved gases (O, N) and sulfur when they enter the steel melt. TiCN particles with a melting point of 3200°C can serve as inoculators, because they act as crystallization centers after being added to the molten metal. They contribute to obtaining an equiaxed or close to an equiaxial grain structure of alloys in the solid state. [ABSTRACT FROM AUTHOR] |
