| The macrosegregation of solute element is one of the strand’s main inner defects,especially in low-carbon steel. The segregation influence the solidification of shell andthe formation of solifification defects such as shrinkage porosity and hot tearing. It alsolower the steel’s usability. But most of numerical simulations about the process of liquidsteel’s solidification in the mold ignore the phenomena of solute transport in liquid steel,and treat steel’s solidus temperature and liquidus temperature as constant. Then there isno way to get the distribution regularities of solute. it also lower the accuracy of resultabout the temperature distribution in the mold and the growth of sheel.During the process of thin slab continuous casting, the small inner space of mold,high casting speed and large flow intensity of liquid steel cause that casting powder iseasy to be entrapped. But most of numerical simulations about the fluid flow in the moldtreat the free surface of liquid steel as wall or symmmery plane and ignore the exist ofcasting powder, then there is no way to get the shape of free surface, and it will lower theaccuracy of the fluid flow around the free surface.Taking the fluid flow inside the CSP thin slab continuous casting mold as researchobject, according to steel mill’s actual production data and continuous casting’stechnological requirements, using business sofeware Fluent, it researchs the process offluid flow, heat transfer and solute transport inside the mold, and gets the shape of freesurface using the VOF model. Through the research, it gets the law of liquid steel’sturbulent flow, temperature distribution, shell’s solidification, solute transport and freesurface’s fluctuation during different parameters(casting speed, depth of nozzle, degree ofsuperheat, width of mold). During actual continuous casting production, it can providereliable reference and guidance for improving the strand’s quality. |
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