Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags

Al2O3, Al2O3·TiN, Al2O3·MgO, and CaO·2Al2O3 are four different types of inclusions in high Al steels. To improve the...

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Autores principales:	Shuo Zhao, Zushu Li, Renze Xu, Darbaz Khasraw, Gaoyang Song, Dong Xu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	LSCM high Al steel inclusions refining slag dissolution Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/15fda84a689e4fe18052c219b0d33fa4
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spelling	oai:doaj.org-article:15fda84a689e4fe18052c219b0d33fa42021-11-25T18:22:04ZDissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags10.3390/met111118012075-4701https://doaj.org/article/15fda84a689e4fe18052c219b0d33fa42021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1801https://doaj.org/toc/2075-4701Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>·TiN, Al<sub>2</sub>O<sub>3</sub>·MgO, and CaO·2Al<sub>2</sub>O<sub>3</sub> are four different types of inclusions in high Al steels. To improve the steel cleanness level, the effective removal of such inclusions during secondary refining is very important, so these inclusions should be removed effectively via inclusion dissolution in the slag. The dissolution behavior of Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>·TiN, Al<sub>2</sub>O<sub>3</sub>·MgO, and CaO·2Al<sub>2</sub>O<sub>3</sub> in CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-MgO slags, as well as the steel-slag reaction, was investigated using laser scanning confocal microscopy (LSCM) and high-temperature furnace experiments, and thermodynamic calculations for the inclusion in steel were carried out by FactSage 7.1. The results showed that Al<sub>2</sub>O<sub>3</sub>·TiN was observed to be completely different from the other oxides. The composite oxides dissolved quickly in the slags, and the dissolution time of the inclusions increased as their melting point increased. SiO<sub>2</sub> and B<sub>2</sub>O<sub>3</sub> in the slag were almost completely reacted with [Al] in steel, so the slags without SiO<sub>2</sub> showed a positive effect for avoiding the formation of Al<sub>2</sub>O<sub>3</sub> system inclusions and promoting inclusions dissolution as compared with SiO<sub>2</sub>-rich slags. The steel-slag reaction was also found to influence the inclusion types in steel significantly. Because of the rapid absorption of different inclusions in the slag, it was found that the dissolution time of inclusions mainly depends on the diffusion in the molten slag.Shuo ZhaoZushu LiRenze XuDarbaz KhasrawGaoyang SongDong XuMDPI AGarticleLSCMhigh Al steelinclusionsrefining slagdissolutionMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1801, p 1801 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	LSCM high Al steel inclusions refining slag dissolution Mining engineering. Metallurgy TN1-997
spellingShingle	LSCM high Al steel inclusions refining slag dissolution Mining engineering. Metallurgy TN1-997 Shuo Zhao Zushu Li Renze Xu Darbaz Khasraw Gaoyang Song Dong Xu Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags
description	Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>·TiN, Al<sub>2</sub>O<sub>3</sub>·MgO, and CaO·2Al<sub>2</sub>O<sub>3</sub> are four different types of inclusions in high Al steels. To improve the steel cleanness level, the effective removal of such inclusions during secondary refining is very important, so these inclusions should be removed effectively via inclusion dissolution in the slag. The dissolution behavior of Al<sub>2</sub>O<sub>3</sub>, Al<sub>2</sub>O<sub>3</sub>·TiN, Al<sub>2</sub>O<sub>3</sub>·MgO, and CaO·2Al<sub>2</sub>O<sub>3</sub> in CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-MgO slags, as well as the steel-slag reaction, was investigated using laser scanning confocal microscopy (LSCM) and high-temperature furnace experiments, and thermodynamic calculations for the inclusion in steel were carried out by FactSage 7.1. The results showed that Al<sub>2</sub>O<sub>3</sub>·TiN was observed to be completely different from the other oxides. The composite oxides dissolved quickly in the slags, and the dissolution time of the inclusions increased as their melting point increased. SiO<sub>2</sub> and B<sub>2</sub>O<sub>3</sub> in the slag were almost completely reacted with [Al] in steel, so the slags without SiO<sub>2</sub> showed a positive effect for avoiding the formation of Al<sub>2</sub>O<sub>3</sub> system inclusions and promoting inclusions dissolution as compared with SiO<sub>2</sub>-rich slags. The steel-slag reaction was also found to influence the inclusion types in steel significantly. Because of the rapid absorption of different inclusions in the slag, it was found that the dissolution time of inclusions mainly depends on the diffusion in the molten slag.
format	article
author	Shuo Zhao Zushu Li Renze Xu Darbaz Khasraw Gaoyang Song Dong Xu
author_facet	Shuo Zhao Zushu Li Renze Xu Darbaz Khasraw Gaoyang Song Dong Xu
author_sort	Shuo Zhao
title	Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags
title_short	Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags
title_full	Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags
title_fullStr	Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags
title_full_unstemmed	Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags
title_sort	dissolution behavior of different inclusions in high al steel reacted with refining slags
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/15fda84a689e4fe18052c219b0d33fa4
work_keys_str_mv	AT shuozhao dissolutionbehaviorofdifferentinclusionsinhighalsteelreactedwithrefiningslags AT zushuli dissolutionbehaviorofdifferentinclusionsinhighalsteelreactedwithrefiningslags AT renzexu dissolutionbehaviorofdifferentinclusionsinhighalsteelreactedwithrefiningslags AT darbazkhasraw dissolutionbehaviorofdifferentinclusionsinhighalsteelreactedwithrefiningslags AT gaoyangsong dissolutionbehaviorofdifferentinclusionsinhighalsteelreactedwithrefiningslags AT dongxu dissolutionbehaviorofdifferentinclusionsinhighalsteelreactedwithrefiningslags
_version_	1718411242446520320

Dissolution Behavior of Different Inclusions in High Al Steel Reacted with Refining Slags

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