Abstract:
The precipitation behaviors of the second phase particles and their textures in the low temperature grain-oriented silicon steel are studied under different processes. The results show that not only the dispersed nanoscale spherical or ellipsoidal MnS and Cu2S precipitations are observed in the hot rolled slabs, but also SiO2, AlN and Si3N4 which are similar to MnS and Cu2S in the morphology and complex compounds that are composed by them together are observed. In the sample, precipitations at the micron scale are mainly composed by SiO2, MnS, Cu2S and AlN, and precipitations at the nanoscale are mainly composed by AlN, Si3N4, MnS and Cu2S. The number of precipitates whose size is from 0.01 μm to 0.2 μm is the largest in the hot rolled slabs, which accounts for about 90%. Compared with the conventional hot rolling slabs, the area density of the inclusions in the CSP samples is smaller, but the average size in the range of greater than 1 μm of that is larger. It will make the secondary recrystallization incomplete during the annealing process, and also it can influence the magnetic property of the products. The distribution of texture which is perpendicular to the rolling direction on cross section in the hot rolled slabs is very different. The texture of the CSP samples is relatively uniform, which is harmful to develop complete secondary recrystallization texture during the subsequent treatment process to obtain good magnetic properties.
