Study of the Effect of Mold Corner Shape on the Initial Solidification Behavior of Molten Steel Using Mold Simulator
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RFACE defects, such as longitudinal or transverse cracks, longitudinal off-corner depressions, and deep oscillation marks (OMs), have widely existed in the continuous casting strands.[1] Many surface defects originate from the initial solidification of molten steel inside the mold.[2,3] If the surface defects could not be removed by scarfing or grinding prior to the rolling process, some detrimental defects such as slivers and blisters would occur on the final rolled products.[4–7] Therefore, the elimination of surface defects is crucial for improving the quality of final continuous casting products.
PEISHENG LYU and WANLIN WANG are with the School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, China and also with the National Center for International Research of Clean Metallurgy, Central South University, Changsha, Hunan, 410083, China. Contact e-mail: [email protected] XUKAI LONG, KAIXUAN ZHANG, and ERZHUO GAO are with the School of Metallurgy and Environment, Central South University. RONGSHAN QIN is with The Department of Engineering and Innovation, The Open University, Milton Keynes, MK7 6AA, UK. Manuscrip submitted March 12, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS B
Many works related to the meniscus phenomena (such as heat transfer, fluid flow, and interaction of forces), which affect the initial solidification and the formation of OMs, have been done to understand the formation mechanism of surface defects.[8,9] Tomono[10] and Ackerman[11] proposed the overflowing and folding mechanism for the formation of OMs through the observations on the scaled caster using organic compounds and steel. Based on the industrial measurements and observations combined with the mathematical modeling, Thomas et al.,[12] proposed a detailed mechanism for the formation of hooks and their associated OMs. Lopez et al.,[13] built a mathematical model for the metal-slag flow coupled with the heat transfer and solidification to study the influence of slag infiltration on the shell solidification and the formation of the OMs. Brimacombe et al.,[1,14] conducted the study to elucidate the relation between the mold hot-face temperatures at the meniscus, slag thickness, and the OM depth. Matsushita et al.,[15] have directly observed the meniscus of molten steel in the mold through a quartz glass window mounted in the mold wall, to investigate the relationship between the surface wave motion of molten steel and the mold oscillation. Furthermore, the dip-type mold simulator was also applied to study the meniscus phenomena by many researchers,[16–20] and their results
showed that the dip-type mold simulator could provide an ideal way for the study of initial solidification behaviors of the molten steel. Wang et al., have conducted the detailed study on the complex interrelationship between the solidified shell surface profile, heat flux, shell thickness, mold-level fluctuation, and the infiltrated slag film using the mold simulator system.[21] The works regarding the effect of the mold oscillation and mold-level flu
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