Abstract
This paper outlines our effort to optimize PMO (Pulsed Magneto-Oscillation) design in order to improve the efficiency of ingot manufacturing. SPMO-H (Simplified Surface Pulse Magneto-Oscillation) and CPMO-H (Simplified Compound Pulse Magneto-Oscillation) were presented on the basis of SPMO (Surface Pulse Magneto-Oscillation) and CPMO (Compound Pulse Magneto-Oscillation). Our numerical and experimental results showed that optimized PMO coil design offered us a device that enabled the operator to examine and operate the melt more convenient without losing the efficiency and decreasing refinement effect. Our work also showed the distance between the coil and the melt surface had little effect on the grain sizes refined. Therefore, in ingot production, the dropping of melt surface is not a problem for PMO application.
Highlights
The quality of final metal product is largely dependent on the solidification structure that emerges during the initial casting [1,2,3,4]
Because the Pulsed Magneto-Oscillation (PMO) coil has no direct contact with the melt, this technology avoids both contamination and spattering [14,15]
In both smalland large-scale production of ingots, PMO coils have to be placed on top of the Inboth bothsmallsmall-and andlarge-scale large-scaleproduction productionofofingots, ingots,PMO
Summary
The quality of final metal product is largely dependent on the solidification structure that emerges during the initial casting [1,2,3,4]. Researchers who applied PMO to pure Al during its nucleation stage and the first half of its growing stage have consistently observed structural refinement and equiaxed-zone enlargement in the resulting ingot, leading them to deduce that the PMO treatment makes nuclei more likely to drop out of the solidifying top surface of the melt or from the mold walls themselves into the deeper liquid part of the melt. This process, known as nucleus drifting, enhances structural refinement [16,17,18]. The results provide feasible suggestion for the application of PMO on the production of ingots
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