Reaction Behaviour between Cerium Ferroalloy and Molten Steel during Rare Earth Treatment in the Ultra-low Carbon Al-killed Steel

In this work, the melting process and reaction behaviour of cerium ferroalloy in liquid ultra-low carbon interstitial free steel was investigated through a special designed hot crucible experiment using standard metallographic techniques including SEM, EDS, XRF, XRD combination with thermodynamic software FactSage 7.2. The evolution mechanism cerium-containing phases during proposed. stretched migrated along direction heat flow, further arms network structures became thinner finally dissolved into molten steel. It concluded that structures’ arms, higher Ce content phases. During process, cerium-enriched phase increased from 43.9 wt% matrix to 90.44 zone, average width decreased 18 µm 2 accordingly. main products interface among ferroalloy, steel, slag were Ce2O3 CeAlO3.