科研之友
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摘要
Microstructure, texture, mechanical properties, and magnetic properties of low carbon and silicon non-oriented electrical steels annealed at 800 degrees C, 820 degrees C, and 860 degrees C were studied. Fine precipitates (Al, Si, Mn)(x)N-y-P, a small quantity of (Al, Si, Mn)(x)N-y, and the aforementioned composite precipitates containing MnS were detected in the samples annealed at 820 degrees C and 860 degrees C. Compared with the samples annealed at 820 degrees C, the number density of precipitates decreased by 20% and the average size increased by 25 nm in the samples annealed at 860 degrees C. The average grain size was 22 mu m, 26 mu m and 46 mu m in the samples annealed at 800 degrees C, 820 degrees C, and 860 degrees C, respectively. The magnetic induction increased by 0.027 T after the annealing temperature of the samples increased from 800 degrees C to 820 degrees C. The iron loss reduced 0.94 W/kg when the annealing temperature increased from 800 degrees C to 860 degrees C. The tensile strength and yield strength of the samples decreased by 21 MPa and 40 MPa when the annealing temperature increased. The loss iron was 4.27 W/kg(P-1.5/50) and magnetic induction was 1.764 T(B-50) for the samples annealed at 860 degrees C. Magnetic properties of the experimental samples were superior to the same grade of commercially available steels.
