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Lejun Zhou,Wanlin Wang,Boxun Lu,Guanghua Wen,Jian Yang 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.1
As potential substitutes for fluorides, the influences of basicity and B2O3 content on viscosity, melting andcrystallization behaviors of low fluorine mold fluxes for casting medium carbon steels were investigatedby using Brookfield viscometer and Single Hot Thermocouple Technique in this study. Results suggestedthat, the break temperature, crystallization temperature and critical cooling rate of low fluorine mold fluxeswere increased with the increase of basicity; while they were decreased with the further addition of B2O3. Meantime, the viscosity and melting temperature range were first attenuated, and then increased greatlywith the increase of basicity; however, they would tend to be reduced with the addition of B2O3 content. Also, it was found that the viscosity of mold flux is not only decided by the degree of polymerization ofsilicate structure, but also greatly affected by its crystallization behavior.
Wanlin Wang,Lejun Zhou,Gu Kezhuan 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.6
A mold flux is widely used to modify heat transfer rates in continuous casting, and crystallization of a mold flux has been identified as a primary factor that influences heat flux from the strand to the mold. By using an infrared radiation emitter, a radiative heat flux was applied to a copper mold covered with solid mold flux disk to simulate the heat transfer phenomena in continuous casting. By this technique it is possible to have a liquid layer, a crystalline layer and a glassy layer in contact with one another and, by varying the energy input, it is possible to study the dynamic nature of the film and its effect on the radiative and overall heat transfer rate. A general heat transfer model was also developed to allow the prediction of the effect of varying the thickness of the three potential layers in the flux film.
Effect of MnO Content on the Interfacial Property of Mold Flux and Steel
Wanlin Wang,Jingwen Li,Lejun Zhou,Jian Yang 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.4
The interfacial property between liquid mold flux and steel has significant impact on the quality of casting slab, and this property is mainly determined by the chemical composition of mold flux and the reaction between the flux and steel. The effect of MnO content on the contact angle and interfacial tension between liquid mold flux and ultra-low carbon steel was investigated by sessile drop method in this article, and the results suggested that both the contact angle and interfacial tension decreased with the increase of MnO content in the mold flux. The increase of Si and Mn and the reduction of Al and Ti in the interaction layer were caused by the chemical reactions occurred in the vicinity of interface between mold flux and steel substrate. Besides, the thickness of the interaction layer increased from 4 μm to 7 μm, then to 9 μm, 11 μm and 15 μm when the MnO content was added from 1 wt% to 3 wt%, then to 5 wt%, 7 wt%, and 9 wt% due to the fact that MnO can simplify the polymerized structure of the melt and improve the penetrability of molten mold flux to make the interfacial reaction easier.
Radiative Heat Transfer Behavior of Mold Fluxes for Casting Low and Medium Carbon Steels
Wang, Wanlin,Gu, Kezhuan,Zhou, Lejun,Ma, Fanjun,Sohn, Il,Min, Dong Joon,Matsuura, Hiroyuki,Tsukihashi, Fumitaka The Iron and Steel Institute of Japan 2011 ISIJ international Vol.51 No.11
<P>An investigation was carried out to study the radiative heat transfer behavior of two typical mold fluxes for casting low (Flux1) and medium (Flux2) carbon steels. By using an infrared radiation emitter, a radiative heat flux was applied to a copper mold covered with solid mold flux disk to simulate the heat transfer phenomena in continuous casting. The effective thermal conductivities were determined by measuring the temperature gradient in the copper mold system. It was found that the solid crystalline mold Flux2 for casting medium carbon steel has a better capability to transfer heat than that of solid crystalline Flux1, while their glassy fluxes behave similar capability. The DHTT (Double Hot Thermocouple Technique) was employed in this paper to study the heat transfer capability of the crystalline mold fluxes. DHTT measurements suggested that the thermal diffusivity of crystalline sample of Flux2 is higher than that of Flux1. The XRD and SEM results were indicated that the precipitated crystalline phase for Flux1 is only granular cuspidine, Ca<SUB>4</SUB>Si<SUB>2</SUB>O<SUB>7</SUB>F<SUB>2</SUB>, while those for Flux2 are consisted of dendritic cuspidine, Ca<SUB>4</SUB>Si<SUB>2</SUB>O<SUB>7</SUB>F<SUB>2</SUB> and gehlenite, Ca<SUB>2</SUB>Al<SUB>2</SUB>SiO<SUB>7</SUB>.</P>