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• W2138049265 abstract "It is well known that non-metallic inclusions influence adversely not only the mechanical properties of steel, but also promote operational problems in the continuous casting process such as nozzle blockage in the slab caster. Inclusions in steel has been the subject of numerous publications since cleanliness is high dependant of that impurities which are nucleated in molten steel and generally precipitate forming oxides, sulfides and more complex particles. Despite the considerable advances in steelmaking, it is impossible to produce steel completely free of inclusions, because of the itself difficultness of the process. In other hand, to understand the nature of non-metallic inclusions and the further role they would play in steel, it is necessary to know the chemical composition of all the components participating in the process, such as fluxes, raw materials, refractory lining, as well as the conditions (temperature, time and sequence of additions), that accelerate the thermodynamics and nucleation rates of inclusions. Recently mathematical simulation has been employed in metallurgy; since this powerful tool permits to get a virtual behavior of the process or part of this, other important advances are the useful scale models to co validate the math simulation. Given the problems underlined above, any investigation work about non-metallic inclusions in steel is justified and well seen by steelmakers, providing the key to attack one of the biggest problems of the metallurgy. The main purpose of this work was to get a better understanding of non-metallic inclusions precipitation with a theoretical study of nucleation and grow rates of various oxides formed in Si-Mn killed steels, taking into account the thermodynamics reactions as well as homogeneous nucleation models. In the other hand, once determined that harmful alumina inclusion was the first one formed in the process at any steelmaking condition and knowing their associated problems, the next step was to eliminate it into the tundish, modifying the liquid hydrodynamics by means of the innovated bubbles curtain, testing for this purpose three different arrays. The idea was to carry out the particles to the bath surface by flotation, simulating also the slag entrapment. It was found that the bubbles curtain employment in the tundish is a good option to remove non-metallic inclusions, but it is necessary to determine the adequate both position and gas flux entrainment. All these aspects are thoroughly analyzed using modern experimental techniques such as Particle Image Velocimetry, Fast video and Computer Fluid Dynamics." @default.
• W2138049265 created "2016-06-24" @default.
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• W2138049265 date "2008-10-02" @default.
• W2138049265 modified "2023-09-27" @default.
• W2138049265 title "TERMODINAMICA DE PRECIPITACION Y CINETICA DE FLOTACION DE INCLUSIONES EN ACERO DESOXIDADO CON Si-Mn" @default.
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