A Multiscale-Based Approach to Understand Dendrite Deflection in Continuously Cast Steel Slab Samples

Abstract

Dendrite bending angle measurements were conducted along two different directions on four steel slab samples collected from a conventional caster. The primary dendrites growing at the slab surface showed a transition in their growth direction as the distance from the surface increased. Numerical fluid flow simulation showed changes in the flow directions that might have caused the change in the growth direction. The bending angle measurements were also correlated with the casting process parameters. Thereafter, a multiscale approach was adopted to predict the dendrite deflection angles by correlating the macro-scale flow profile with the micro-scale bending angle formulation and subsequently corroborated with the industrial scale measurements.

Analysis of macrosegregation during slab continuous casting using 3D-longitudinal 2D hybrid model

“…During solidification, C is redistributed at the solid–liquid interface, leading to its enrichment at the solidification front. In the turbulent flow region, the strong flow has washing effect on the dendrites at the solidification front [42], thus affecting the solute distribution at the solidification front [43]. Owing to the continuous ‘washing effect’ of the solidification front by recirculating flow in the upper part of the turbulent flow region, the solute C that accumulates at the solidification front is removed by the recirculation flow and transported to the vortex core, which decreases the C enrichment at the solidification front and increases it in the liquid pool.…”