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

This study investigates the bending angles of dendrites in continuously cast steel slab samples, aiming to understand the factors influencing their deflection during the solidification process. We collected samples from a conventional caster and performed dendrite bending angle measurements along two different directions on four samples. Our findings reveal that primary dendrites at the slab surface exhibit a transition in growth direction with increasing distance from the surface. Additionally, numerical fluid flow simulations indicated alterations in flow direction which may contribute to this growth directional change. We correlated the bending angle measurements with casting process parameters to establish their impact on dendrite behavior. By utilizing a multiscale approach, we predicted dendrite deflection angles by linking the macro-scale flow profile with micro-scale bending angle formulations. These predictions were subsequently validated against industrial-scale measurements, highlighting the significance of understanding macrosegregation and solidification structure in optimizing the continuous casting process to meet stringent product quality requirements. Understanding these relationships is essential for improving the efficiency of steel production processes and minimizing costly post-treatment steps.