Mathematical Models for Near Net Shape Casting Processes

摘要

A three-dimensional fully coupled turbulent fluid flow, heat transfer and solidification model for a twin-roll caster of steel has been developed. The model enables different metal delivery configurations and their effect on solid shell thicknesses to be evaluated. A typical tubular nozzle with horizontal outlets directed towards the side dams, as well as a vertical slot nozzle, have been simulated. The results show that the tubular nozzle leads to a non-uniform thickness of the twin solidifying shells along the width of the rolls. These results are in agreement with measurements of heat fluxes to the roll surfaces. A similar model has been constructed for a horizontal single belt caster with extended nozzle delivery systems, with and without flow modifiers. It is shown that the flow modifier has a positive effect on the flow patterns and on steel shell formation.