The Behavior of MgAl2O4-TiN Complex Inclusion in Consumable Electrode during ESR for GCr15SiMn

The MgAl2O4-TiN complex inclusion found in GCr15SiMn consumable electrode with MgAl2O4 as the core and TiN as the periphery is harmful to steel. It is significant to make clear the behavior of this complex inclusion during consumable electrode remelting for the clean ESR ingot production. In this article, the decomposition model of the periphery TiN is established to investigate the possibility of such complex inclusion retaining in the subsequent ingot after ESR melting according to the diffusion of solutes Ti and N. Based on this model and the stable phase diagram of Mg-Al-O system inclusion under different temperatures, it demonstrates that during the course of consumable electrode remelting, the periphery TiN will almost completely decompose as Ti and N, and the rate of decomposition will speed up with the increase of temperature. However, part of the MgAl2O4 core will possibly transform to MgO inclusion with increasing temperature.