Theoretical and experimental analyses of continuous casting with soft-contacted mould①
(Ⅱ)—EMF calculation and experimental analyses
(Ⅱ)—EMF calculation and experimental analyses
(School of Materials Science and Engineering, Shanghai University,
Shanghai 200072, P.R.China)
Shanghai 200072, P.R.China)
Abstract: Coupling the quasi-3D numerical simulation of the electromagnetic field and the experiments with some metals, a series of phenomena in the processes of continuous casting with soft-contacted mould was analyzed. Some theoretical and experimental models were presented, from which following results were obtained. 1) The electromagnetic force is related with electric conductivity of billet as a power function to 0.4. 2) The heat transfer between billet and mould is related with the contacting pressure, and it is a linear function for tin billet approximately. 3) The distance between initial solidification point and meniscus in billet is related with the surface magnetic flux density as a fourth root function. 4) The temperature gradient in the initial solidifying shell is reduced, which can decrease the tendency of hot tearing on the surface of billet, and increase the equiaxed crystal zone in billet. 5) The stronger the magnetic flux density is, the more shallow and the thinner the oscillation mark on the surface of billet is. 6) The depth of oscillation mark on the billet cast by the soft-contacted mould can be reduced to about 10% in comparison with that on the billets cast by traditional mould. 7) In non-dimensional condition, the average depth of the oscillation marks on the billets cast by the soft-contacted mould decreases with increasing magnetic flux density on there as a complementary error function.
Key words: electromagnetic continuous casting (EMC); soft-contacted mould; electromagnetic field (EMF)