The effects of grain size on the magnetic properties of nonoriented electrical steel sheets

Correlation Between Microstructure, Texture, and Magnetic Induction in Nonoriented Electrical Steels

“…H < 300A/m, as can be seen from commercial Fe-Si steels. Subsequently, since one could expect that the microstructural features, especially the mean grain size, affect the magnetizing behavior, one observes a decrease of B as function of the grain size D at different values of the applied field, as was also studied by [13]. The non-linear dependence seems to indicate a dependence such as B proportional to 1/D, as may be correlated with the fact that the critical field for domain movement is proportional to 1/D.…”

Local Magnetic Properties in Non-oriented Electrical Steel and Their Dependence on Magnetic Easy Axis and Misorientation Parameters

“…[20] Given the grain diameter range of these samples (~135 to 150 lm), an increase in grain diameter will increase the total loss, since an approximate guideline value for minimum loss occurs at approximately 150 lm. [2,31] The effect of grain size on losses is divided between influences from hysteresis losses (where GB's are acting as sites for domain wall formation and annihilation) and excess/anomalous losses (eddy current effects associated with domain walls). [32] Hysteresis loss increases with the inverse of grain diameter, which approximates the grain boundary area per unit volume.…”

“…[32] Excess losses increase in proportion to the domain width, and from this, excess losses are proportional to the square root of grain diameter. [31,32] The total loss for these samples is related to the minimum of these two loss components (with bulk scale classical loss being constant since the thickness and resistivity of the samples tested were constant).…”

Effects of Temperature and Strain Rate on Deformation Twinning in Fe–Si Alloy

“…Simanaka et al 16) measured the grain size dependence of core loss in Fe-3.2%Si alloys and reported the minimum value at around 150 μm. Furthermore, Shiozaki et al 17) reported that an optimum grain size was not dependent on the Si content. For these reasons, an optimum grain size was selected.…”