Modeling on solute enrichment and inclusion precipitation during the solidification process of high sulfur steel slab
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To investigate the solute transport and redistribution in the slab continuous casting processes of high sulfur steel, a three-dimensional model coupling turbulent flow, heat and solute transportation was developed. And then a thermodynamic model for MnS precipitation was established to study the MnS precipitation and distribution in strand on a macroscale and its effect on solute macrosegregation was also explored. The results showed that the temperature and solutes concentration were the main factors for the precipitation of MnS. The effect of temperature was significant when the solid fraction was greater than 0.8. Due to the precipitation of MnS, the segregation ratio of solutes Mn and S on the center line declined from 1.05–1.15 to 0.97–1.01 and from 1.2–1.45 to 1.00–1.08, respectively. And the solute concentration of Mn and S declined and distributed more uniformly in the strand, and the macrosegregation of Mn and S was also suppressed greatly.
I. INTRODUCTION
Segregation is an inherent characteristic during the process of alloy solidification, and it is one of the important quality defects in the continuous casting (CC) process. During the CC solidification process of molten steel, the solute will be enriched at the solidification front (mushy zone) of the strand, which can promote the precipitation of inclusions. In response, the precipitation of inclusions may affect the solute concentration distribution and segregation in strand.1,2 Literature2,3 pointed out that the precipitation of inclusions could reduce the solute concentration in strand, which could finally restrain the solute segregation effectively. Therefore, taking the inclusion precipitation into consideration was required for the accurate prediction of solute segregation during solidification process. In reaction to the phenomenon of solutes segregation and inclusions precipitation during the molten steel solidification process, previous researches4,5 were carried out by the means of numerical simulation and experiment. The solute segregation behavior5,6 and inclusions precipitation (such as MnS,7 SiO2,8 TiN9 and so on10), as well as its influencing factors (such as soft reduction,11 electromagnetic stirring,12,13 secondary cooling mode,14 and other technology15,16) during the metallurgical process were comprehensively investigated. However, most researches mainly focused on studying the solute Contributing Editor: Jürgen Eckert Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2017.333
segregation and inclusion precipitation separately,17–19 or systematically studying the interaction between microsegregation and inclusion precipitation.20 Researches on the interaction between the macrosegregation and inclusion precipitation during CC process were mainly carried out by experimental method,3,21 and it was difficult to obtain the distribution of solutes and inclusions in the whole macroscopic section of the strand. And there were a little reports on simulation of the interaction betw
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