The dendrite arm spacing and grain size in continuous casting has been studied by mathematical modelling and experimental measurements. Two in-house tools have been used in the study. The heat transfer is calculated by the model called TEMPSIMU and the solidification as well as the microstructural phenomena by the thermodynamic-kinetic software called IDS. The models are validated by comparison the calculated results with experiments from steel plants. In continuous casting, the solidification structure is also influenced by process parameters. In this study the effect casting speed, superheat and secondary cooling on arm spacings and grain size is also studied. The in-house models and the obtained results are presented in this paper. Using the developed models, the heat transfer and microstructure can be controlled more accurately.
Industrial data set with 400 CC (continuous casting) steel slabs were analysed by a statistical method for revealing the real connections between the technological parameters, heat transfer model results and the precisely determined centerline segregation index. Because of the poor correlations a new model was developed in which the shrinkage and deformations of the shells of the slabs can also be taken into account. It has been proved that the stopping of liquid movement below about 30 % liquid ratio plays an important role in the centerline segregation formation. The conclusions of the calculations are in good accordance with the results of the metallographical analysis.
Industrial data set with 400 CC steel slabs were analysed by a statistical method for
revealing the real connections between the technological parameters, heat transfer model results and
the precisely determined centerline segregation index. Because of the poor correlations a new model
was developed in which the shrinkage and deformations of the shells of the slabs can also be taken
into account. It has been proved that the stopping of liquid movement below about 30 % liquid ratio
plays an important role in the centerline segregation formation. The conclusions of the calculations
are in good accordance with the results of the metallographical analysis.
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