"MODELING OF A CONTINUOUSLY CAST BILLET CENTRAL POROSITY REDUCING PROCESSES"

Abstract

"The results of studies aimed at solving the actual problem of improving the quality of continuously cast billets are presented. Technical solutions have been developed to improve the crystallization process by means of pulsating metal blowing with an inert gas in the mold and shear reduction of the billet in the secondary cooling zone of a continuous casting machine (CCM). Physical modeling of shear reduction of continuously cast billets in the secondary cooling zone of CCM on model ingots has been carried out. The resulting macrostructures of model ingots were studied, indicating the absence of internal cracks in the central zone of the billet at a degree of deformation of up to 5 % and small shear angles (≤ 15–18°), and at a degree of deformation of more than 5 % and shear angles of about 18°, cracks develop periodically, emerging on the surface of the ingot. With pulsating blowing and shear «soft» compression in the final period of solidification, their positive effect on reducing the zone of columnar crystals and reducing the central porosity was established. Keywords: continuously cast billet, central porosity, CCM, crystallization, crack. "