Rezumat
CZU 537.528: 669.017.16
DOI https://doi.org/10.52577/eom.2026.62.1.19
The paper deals with the investigation of the distribution of the electromagnetic field and force loading in the melt under a combined electric current and magnetic pulse treatment in frequency modes. It is shown that at current frequencies up to 5 kHz, the eddy fields cover almost the entire volume of the melt. Increasing the frequency to 25 kHz and above leads to their concentration in the near-surface and near-wall zones. It is established that an increase in the current frequency results is a monotonic rise in the electric field strength. The magnetic field strength increases abruptly, reaching about 90% of its peak value, and then the maximum at a frequency of 100 kHz. Further, the curve enters the saturation mode. It is shown that despite a significantly uneven distribution of electromagnetic fields at high frequencies, a relatively high uniformity index is ensured, ranging from 1 at 5 kHz to 0.45 at 200 kHz. At the same time, a stable integral force effect is exerted on the entire volume of the melt, while the peak electromagnetic force density increases by more than two times with increasing current frequency. The data obtained in the work show that the proposed method of joint processing provides wide-range regulation of the characteristics of the energy impact on the melt, which, ultimately, will make it possible to find conditions for obtaining a favorable structure and improved properties of cast metal that are rational in terms of the price-quality ratio. This should ensure its adaptability to modern technological processes for obtaining castings and its innovative appeal.
Keywords: electric current treatment, magnetic pulse treatment, melt, electromagnetic field, current frequency, force loading.