Vorgänge bei der Bildung primärer Desoxydationsprodukte in Stählen

Abstract

Einfluß der Desoxydation auf den Reinheitsgrad des Stahls. Das Abscheidungsverhalten oxydischer Verunreinigungen. Zweck der Untersuchungen und Versuchsdurchführung unter Anwendung der Vakuumheißextraktion, Mikrosonde und Rückstandsisolierung. Schmelzenführung und Probenahme. Auswertung und Deutung der Versuchsergebnisse. Untersuchung von Einschlüssen durch Ruckstandsuntersuchung.

Crystal growth in liquid steel during secondary metallurgy

“…Therefore, the growth rate depends on the nucleation rate, which depends on the levels of supersaturation. With respect to the formation of aluminum oxide, supersaturation (s) can be defined as [1] where a O and a Al refer to the activity of oxygen and the activity of aluminum in the steel bath. The term is the standard formation free energy of aluminum oxide, R is the gas constant, and T is the absolute temperature.…”

“…Globular iron aluminates, which can be enveloped by aluminum oxide, and pure aluminum oxide inclusions, which may occur as spheres, polyhedra, plates, dendrites, and clusters, have been described. [1][2][3][4][5][6][7][8][9][10][11][12] In particular, Steinmetz et al [4][5][6]11,12] were aware that the morphology of an inclusion depends not only on its phase, but also on the activities of its components in the steel bath, i.e., on the degree of supersaturation. They studied the relationship between inclusion morphology and the aluminum and oxygen contents of the steel.…”

Interfacial reaction between Al2O3–C refractory and Al killed steel

“…The current results are in good agreement with the previously reported ones. 15,16 That is, FeO enriched inclusions (FeO–Al 2 O 3 ) observed in Al killed Fe are gradually reduced to Al 2 O 3 by Al dross initially injected. Therefore, it is believed that the reacted layer of inclusions is widely distributed on the Fe surface.…”

“…The current results are in good agreement with the previously reported ones. 15,16 That is, FeO enriched inclusions (FeO-Al…”

Interfacial Reaction between Al2O3–SiO2–C Refractory and Al/Ti-Killed Steels

“…Therefore, the current results are ascribed to the involvement of oxygen as a surface active element in the reaction, which is in good agreement with the previously reported ones. 18,19) That is, FeO-enriched inclusions (FeO-SiO2-Al2O3) observed in Al-killed Fe are gradually reduced to Al2O3 by Al dross initially injected. It is believed that the reacted layer can be formed in such a way that initially FeOenriched liquid layer of inclusions are widely distributed on Fe surface.…”