Evolution of Dendritic Morphology Under HPMO Treatment

The aim of the paper is to investigate the effect of hot-top pulsed magneto oscillation (HPMO) on the microstructure and dendritic morphology of solidified structure in ingot casting. The experiment indicates that the dendrites located in the center of ingot can be completely changed from dendritic crystals into granular equiaxed crystals, the dendrites located in the 1/2-radius area of ingot can be changed from coarse dendritic crystals into tiny equiaxed crystals that after HPMO treatment. Further, applying the HPMO technology in the solidification process of the ingot under slow-cooling can refine the solidification structure and change the solidified microstructure morphology from dendritic into equiaxed. It is also proved that the prospect of applying the HPMO technology to improve the ingot quality in industrial mold casting is very promising.