Thermo-fluid model of meniscus behavior and oscillation mark formation in steel continuous casting
Yan, Xiaolu
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https://hdl.handle.net/2142/97791
Description
Title
Thermo-fluid model of meniscus behavior and oscillation mark formation in steel continuous casting
Author(s)
Yan, Xiaolu
Issue Date
2017-04-28
Director of Research (if dissertation) or Advisor (if thesis)
Thomas, Brian G.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Continuous casting
Model
Oscillation mark
Abstract
The surface quality of steel depends on initial solidification at the meniscus during continuous casting. A computational thermal-fluid model has been developed to simulate the complex transient behavior of the slag layer between the oscillating mold wall, the slag rim, the slag/liquid steel interface, and the solidifying steel shell in the meniscus region. It includes transient heat transfer, multi-phase fluid flow, solidification of the slag and steel, and movement of the mold during several oscillation cycles. The model is validated with transient temperature measurements and shell strand measurements from a “mold simulator” lab experiment and with plant measurements of oscillation mark (OM) depth and slag consumption. Hook type oscillation mark is predicted to form by steel overflowing the meniscus. In addition to the commonly predicted/measured temperature increase during the negative strip time (NST), a smaller temperature increase is predicted during the positive strip time (PST) for thermocouples near steel level, and can be associated with the overflow event. These discoveries help to explain the overflow mechanism in detail and reveal new insights into the phenomena which govern initial solidification, oscillation mark formation, and surface defects in this process.
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