Effects of B{sub 2}O{sub 3} on Crystallization, Structure, and Heat Transfer of CaO-Al{sub 2}O{sub 3}-Based Mold Fluxes
- University of New South Wales, School of Materials Science and Engineering (Australia)
- Baosteel Group Corporation Research Institute (China)
The reaction between traditional CaO-SiO{sub 2}-based mold fluxes and high-Al steel inevitably changes flux composition, and, consequently, flux properties. This problem can be mitigated by using CaO-Al{sub 2}O{sub 3}-based mold fluxes. To maintain appropriate melting properties, CaO-Al{sub 2}O{sub 3}-based mold fluxes contain B{sub 2}O{sub 3}, which is an effective fluxing agent that decreases the liquidus temperature. In this article, the effects of B{sub 2}O{sub 3} on crystallization behavior, structure, and heat transfer of CaO-Al{sub 2}O{sub 3}-based mold fluxes were studied using single/double hot thermocouple technique, Raman spectroscopy, and infrared emitter technique. The increase of B{sub 2}O{sub 3} content from 7.6 to 13.1 mass pct suppressed the crystallization tendency of mold fluxes in continuous cooling experiments and isothermal experiments conducted over 1273 K (1000 °C). The isothermal crystallization below 1273 K (1000 °C) was also inhibited when B{sub 2}O{sub 3} content increased from 7.6 to 9.6 mass pct; but a further increase of B{sub 2}O{sub 3} content to 13.1 mass pct did not show a visible effect on the crystallization tendency. The increase of B{sub 2}O{sub 3} content from 9.6 to 13.1 mass pct improved the heat fluxes under an incident thermal radiation of 1.6 MW/m{sup 2}; however, the increase of B{sub 2}O{sub 3} content from 7.6 to 9.6 mass pct slightly decreased the heat transfer rate. Crystallization of fluxes and heat transfer were discussed in relation to flux structure.
- OSTI ID:
- 22933580
- 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: 1 Vol. 50; ISSN 1073-5615; ISSN MTBSEO
- Country of Publication:
- United States
- Language:
- English
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