Effect of Processing Methods on the Magnetic Properties of Non-oriented Electrical Steel

The effects of two sample processing methods, punching and laser cuttingLaser cutting, on the magnetic properties of high-grade non-oriented electrical steelElectrical steel were studied. The results show that the coercivity and ironIron loss of laser cuttingLaser cutting samples are higher than those of mechanical punching, while the permeability gets lower in laser cuttingLaser cutting samples. Through the analysis of grain internal stress by EBSDElectron back scattered diffraction (EBSD), it is found that there is a stress concentration area in the cutting section of punching sample, while there is no obvious stress concentration area near in the cutting section of laser cuttingLaser cutting sample. While the laser cuttingLaser cutting surface is wrapped with an oxide layer with the thickness of 1 μm through EDS energy spectrum analysis. The oxide layer causes the hysteresis lossHysteresis loss increased under the magnetic induction intensity of 1.0 T, and the influence is amplified with the increase of loading frequency. However, when the magnetic induction intensity increases to 1.5 T, the influence of oxide layer on hysteresis lossHysteresis loss decreases and the abnormal lossAbnormal loss increases.