A New Mechanism of Hook Formation during Continuous Casting of Ultra-Low-Carbon Steel Slabs
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In this paper, a detailed mechanism for the formation of curved hooks and their associated periodic oscillation marks was presented, based on a careful analysis of numerous specially etched samples from ultra-low-carbon steel slabs combined with previous measurements, observations, and theoretical modeling results.Abstract:
The initial stages of solidification near the meniscus during continuous casting of steel slabs involve many complex inter-related transient phenomena, which cause periodic oscillation marks (OMs), subsurface hooks, and related surface defects. This article presents a detailed mechanism for the formation of curved hooks and their associated OMs, based on a careful analysis of numerous specially etched samples from ultra-low-carbon steel slabs combined with previous measurements, observations, and theoretical modeling results. It is demonstrated that hooks form by solidification and dendritic growth at the liquid meniscus during the negative strip time. Oscillation marks form when molten steel overflows over the curved hook and solidifies by nucleation of undercooled liquid. The mechanism has been justified by its explanation of several plant observations, including the variability of hook and OM characteristics under different casting conditions, and the relationships with mold powder consumption and negative/positive strip times.read more
Citations
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Review on Modeling and Simulation of Continuous Casting
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Flow Control with Local Electromagnetic Braking in Continuous Casting of Steel Slabs
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Measurement and Prediction of Lubrication, Powder Consumption, and Oscillation Mark Profiles in Ultra-low Carbon Steel Slabs
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Transient Thermo-fluid Model of Meniscus Behavior and Slag Consumption in Steel Continuous Casting
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References
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Heat-transfer and solidification model of continuous slab casting: CON1D
Ya Meng,Brian G. Thomas +1 more
TL;DR: In this paper, a model of heat transfer and solidification of the continuous casting of steel slabs is described, including phenomena in the mold and spray regions, which can be applied to a wide range of practical problems in continuous casters.
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Crack formation in the continuous casting of steel
J. K. Brimacombe,K. Sorimachi +1 more
TL;DR: In this paper, a review examines the different types of internal and surface cracks that can form during the continuous casting of steel and assesses the operating and metallurgical factors that are known to influence crack formation.
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The formation of oscillation marks in the continuous casting of steel slabs
E. Takeuchi,J. K. Brimacombe +1 more
TL;DR: In this paper, the formation of oscillation marks on the surface of continuously cast slabs has been studied by metallographically examining slab samples and by performing a set of mathematical analyses of heat flow, lubrication, and meniscus shape.
Journal ArticleDOI
Modeling of the continuous casting of steel - past, present and future
TL;DR: This lecture honoring Keith Brimacombe looks over the history, current abilities, and future potential of mathematical models to improve understanding and to help solve practical problems in the continuous casting of steel.
Journal ArticleDOI
Modeling transient slag-layer phenomena in the shell/mold gap in continuous casting of steel
Ya Meng,Brian G. Thomas +1 more
TL;DR: In this article, the effect of casting speed and mold-powder viscosity properties on slag-layer behavior between the oscillating mold wall and the solidifying steel shell was investigated.
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