Crystallization Characteristics and In-Mold Performance of Electroslag Remelting-Type TiO{sub 2}-Bearing Slag
- University of Science and Technology Beijing (USTB), State Key Laboratory of Advanced Metallurgy (China)
- Xi’an University of Architecture and Technology, School of Metallurgical Engineering (China)
The non-isothermal crystallization characteristics of the electroslag remelting (ESR)-type TiO{sub 2}-bearing slag were studied. The effect of crystallization characteristics of the slag on the in-mold performance was verified by ESR pilot trials operating in a static mode. The results showed that increasing TiO{sub 2} content decreased the crystallization temperature and liquidus temperature of the slag and suppressed the crystallization tendency of the slag. There is no change in the types of the crystalline phases in the slag with different TiO{sub 2} contents during cooling, i.e., 11CaO·7Al{sub 2}O{sub 3}·CaF{sub 2}, CaTiO{sub 3}, and CaF{sub 2}. The sequence of crystal precipitation during cooling was 11CaO·7Al{sub 2}O{sub 3}·CaF{sub 2} to CaTiO{sub 3}, and then CaF{sub 2} with increasing TiO{sub 2} content from 4.2 to 12.6 mass pct. With adding 16.8 mass pct TiO{sub 2} in the slag, the precipitation of 11CaO·7Al{sub 2}O{sub 3}·CaF{sub 2} and CaTiO{sub 3} took place simultaneously, followed by CaF{sub 2}. With the increase in the TiO{sub 2} content from 4.2 to 16.8 mass pct in the slag, the dominant crystalline phase changed from 11CaO·7Al{sub 2}O{sub 3}·CaF{sub 2} to CaTiO{sub 3}. The morphology of 11CaO·7Al{sub 2}O{sub 3}·CaF{sub 2} and CaTiO{sub 3} changed from faceted and bonelike to elliptically faceted and blocky, respectively. The morphology of CaF{sub 2} were spherical in all cases, irrespective of TiO{sub 2} contents in the slag. The decrease in the crystallization tendency of the slag with increasing TiO{sub 2} contents was attributed to the decrease in the activity of CaO in the slag. The increasing of TiO{sub 2} content in the slag are favorable for providing thin slag skin and stable heat flux across the slag skin, which improved the surface quality of the as-cast ESR ingot as demonstrated by ESR pilot trials operating in a static mode.
- OSTI ID:
- 22933714
- Journal Information:
- Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science Journal Issue: 3 Vol. 50; ISSN 1073-5615; ISSN MTBSEO
- Country of Publication:
- United States
- Language:
- English
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