Analysis of Crystallization Behavior of Mold Fluxes Containing TiO2 Using Single Hot Thermocouple Technique

The crystallization behavior of mold fluxes containing 0-8 mass% TiO2 was investigated using the single hot therrnocouple technique （SHTT） and X ray diffraction （XRD） to study the possible effects on the coordination of heat transfer control and strand lubrication for casting crack sensitive peritec...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2016-04, Vol.23 (4), p.322-328
Main Authors: LEI, Yun, XIE, Bing, MA, Wen-hui
Format: Article
Language:English
Subjects:
Applied and Technical Physics
CCT curve
crystallization
Engineering
kinetics
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Metallurgy and Metal Working
mold flux
Physical Chemistry
Processes
single hot thermocouple technique
TTT curve
TTT曲线
XRD分析
二氧化钛
模铸保护渣
结晶器
结晶行为
连续冷却转变曲线
非等温过程
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Summary:The crystallization behavior of mold fluxes containing 0-8 mass% TiO2 was investigated using the single hot therrnocouple technique （SHTT） and X ray diffraction （XRD） to study the possible effects on the coordination of heat transfer control and strand lubrication for casting crack sensitive peritectic steels. Time-temperature-transforma tion （TTT） and continuous-cooling transformation （CCT） curves were plotted using the data obtained from SHTT to characterize the crystallization of the mold fluxes. The results showed that crystallization of the mold fluxes during isothermal and non-isothermal processes was suppressed with TiO2 addition. From the TTT curves, it could be seen that the incubation and growth time of crystallization increased significantly with TiO2 addition. The CCT curves showed that the crystallization temperature initially decreased, and then suddenly increased with increasing the TiO2 content. XRD analysis suggested the presence of cuspidine in the mold fluxes with lower TiO2 content （〈4 mass%） , while both perovskite and cuspidine were detected in the mold fluxes when the TiO2 content was increased to 8 mass%. In addition, the growth mechanisms of the crystals changed during the isothermal crystallization process from interface controlled growth to diffusion-controlled growth with increasing the TiO2 content.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(16)30052-8