Effect of superheats and pulling speeds on solidification structure of rectangular continuous casting billets
To improve the solidification microstructure of CuNiCoSi rectangular continuous casting billets,a CuNiCoSi rectangular billet cross-section solidification microstructure model was established using the CA-FE meth-od.The effects of different superheats and pulling speeds on the solidification microstructure were investigated using this model.The results indicate that reducing superheat can increase the proportion of equiaxed crystal zone in the solidification microstructure and improve the uniformity of the equiaxed crystal zone.Keeping other conditions con-stant,decreasing superheat from 30 ℃ to 15 ℃ resulted in an increase in the equiaxed crystal zone area from 42.90％to 47.32％,while the maximum equiaxed grain area decreased from 42.06 mm2 to 33.94 mm2.Increasing the pulling speed can increase the proportion of equiaxed grains in the solidification structure and obtain finer equi-axed grains.Increasing the pulling speed from 100 mm/min to 400 mm/min resulted in an increase in the equiaxed crystal zone area from 42.48％to 50.14％,while the average equiaxed crystal area decreased from 10.59 mm2 to 9.38 mm2.After optimizing the superheat and pulling speed,the quality of the billet solidification microstructure has significantly improved.
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