Magnetic Aging, Anomalous and Hysteresis Losses

In this study the magnetic aging effect on anomalous and hysteresis loss was investigated, as well as its effect on domain morphology. For this purpose, non-oriented fully processed electrical steel with 2.3 wt.%Si - 79 ppm C and non-oriented semi-processed electrical steel annealed at 750 °C for 5 hours with 0.4 wt.%Si - 340 ppm C were aged at 150 °C. The anomalous loss has been shown to be less affected by the magnetic aging. The increasing of the excitation frequency has induced a reduction on anomalous loss measured on aged steel. All increases presented by total loss were provided by hysteresis loss. The main disturbance in magnetic domain morphology appears to have been caused by different grain orientation.

本研究围绕磁时效对反常损耗、磁滞损耗的影响，及其对磁畴形貌（domain morphology）的作用展开探究。为此，本研究选用两类无取向电工钢作为试样：其一为成分为2.3wt.%硅（Si）、79ppm碳（C）的全处理态无取向电工钢；其二为经750℃退火5小时、成分为0.4wt.%Si、340ppm C的半处理态无取向电工钢，并将两类试样置于150℃环境下进行时效处理。实验结果表明，反常损耗受磁时效的影响相对较小；励磁频率的提升会导致经时效处理的电工钢的反常损耗降低。总损耗的全部增幅均由磁滞损耗贡献。磁畴形貌的主要扰动似乎由晶粒取向差异所引发。