A Kinetic Study of the Effect of Basicity on the Mold Fluxes Crystallization

The effect of basicity on the mold fluxes crystallization was investigated in this article. The time-temperature-transformation (TTT) diagrams and continuous-cooling-transformation (CCT) diagrams of mold fluxes with different basicity were constructed by using single, hot thermocouple technology (SH...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2012-04, Vol.43 (2), p.354-362
Main Authors: Zhou, Lejun, Wang, Wanlin, Ma, Fanjun, Li, Jin, Wei, Juan, Matsuura, Hiroyuki, Tsukihashi, Fumitaka
Format: Article
Language:English
Subjects:
Applied sciences
Basicity
Calcium silicates
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cooling rate
Crystallization
Exact sciences and technology
Kinetics
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Mold fluxes
Nanotechnology
Process metallurgy
Production of metals
Structural Materials
Surfaces and Interfaces
Thin Films
Three dimensional
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Summary:The effect of basicity on the mold fluxes crystallization was investigated in this article. The time-temperature-transformation (TTT) diagrams and continuous-cooling-transformation (CCT) diagrams of mold fluxes with different basicity were constructed by using single, hot thermocouple technology (SHTT). The results showed that with the increase of basicity, the incubation time of isothermal crystallization became shorter, the crystallization temperature was getting higher, and the critical cooling rate of continuous cooling crystallization became faster. The X-ray diffraction analysis suggested that calcium silicate (CaO·SiO 2 ) was precipitated at the upper part of the TTT diagram and cuspidine (Ca 4 Si 2 O 7 F 2 ) was formed at the lower part, when the basicity of mold fluxes was within 1.0 to 1.2. However, when basicity was 0.8, only the cuspidine phase was formed. A kinetic study of isothermal crystallization process indicated that the increase of the basicity tended to enhance the mold flux crystallization, and the crystallization activation energy became smaller. The crystallization mechanism of cupsidine was changing from one-dimensional growth to three-dimensional growth with a constant number of nuclei, when the basicity of mold fluxes varied from 0.8 to 1.2.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-011-9591-5