Abstract
How to coordinate the contradiction between lubrication and heat transfer in the peritectic steel casting process is the key technical difficulty in preparing mold fluxes. The mold fluxes that are required for casting are subjected to the shear stress generated by mold oscillation and slab movement, which affects the crystallization performance of slags. The quantitative effect of slags’ crystallization performance by shear stress is studied to develop a low-basicity and high-crystallization mold flux to solve the above problem. The results show that the crystallization kinetic condition is promoted, and the crystallization activation energy is reduced by the shear stress, which leads to an increase in the crystallization temperature. Concurrently, the crystal size is reduced. However, the shear stress has no effect on the crystalline phase. The influence of different shear stresses on the crystallization ability of molten slags is related to the crystal nucleation and growth mechanisms. The crystalline fraction of the slag films at 300 rpm (69 s−1) is 44.7%, which is an increase of 17.7% compared with the crystalline fraction of the slag films at 200 rpm (46 s−1). Moreover, the shear stress has little effect on the lubricating properties of the mold fluxes, although the crystallization ability is promoted by the agitation.
Highlights
Mold fluxes containing various fluxes and carbon are functional materials based on silicate.They play an important role in ensuring the smoothness of the continuous casting process and the quality of steel in the continuous casting process [1,2]
The aim of this study is to provide a theoretical basis for preparing the low-basicity and high-crystallization mold fluxes that were applied in the casting process of peritectic steel
The crystallization performance of mold fluxes is promoted by the shear stress, and the
Summary
Mold fluxes containing various fluxes and carbon are functional materials based on silicate.They play an important role in ensuring the smoothness of the continuous casting process and the quality of steel in the continuous casting process [1,2]. Mold fluxes in the lower half of the mold infiltrate the mold/shell channel, regulate the heat transfer between the shell and the mold, and lubricate the newly formed shell, which are two of the most important effects among all of their functions. Surface defects such as longitudinal cracks in the continuous casting of peritectic steel slabs, with the carbon content being 0.09–0.16%, can be formed due to the violent release of stress caused by the peritectic reaction and peritectic phase transformation. Lubrication of the shell can be deteriorated by the high-alkalinity mold fluxes, and it can even enhance the possibility of breakout by Materials 2018, 11, 1085; doi:10.3390/ma11071085 www.mdpi.com/journal/materials
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