取向硅钢常化过程析出物和组织演变规律

使用透射电镜(TEM)和电子背散射衍射技术(EBSD)对取向硅钢热轧板常化过程中析出物和组织的变化进行了研究。结果表明,热轧及常化过程中都有大量细小的析出物析出,其中热轧板中主要是MnS和少量MnS与AlN的复合析出物;常化板中主要是AlN和少量MnS与AlN的复合析出物;且常化板中析出物数量比热轧板中析出物的数量高1~2个数量级,平均尺寸减小约16nm。热轧板的组织沿着厚度方向存在较大不均匀性,高斯织构主要存在于热轧板次表层的变形组织中,且强度约为2;常化热处理后试样厚度方向组织的均匀性变大且次表层可以得到细小均匀的晶粒组织,高斯织构依然存在于试样次表层但强度减小约为0.8。

The evolution of precipitate and microstructure during hot band annealing of grain-oriented silicon steel

The changes of precipitate and microstructure during hot band annealing were studied by transmission electron microscope (TEM) and electron back scatter diffraction system (EBSD). The results show that a lot of precipitates precipitate during hot rolling and hot band annealing. The precipitates are mainly MnS and a little of MnS-AlN composite in hot-rolled band, while there are mainly AlN and a little of MnS-AlN composite in annealed hot-rolled band. The amount of precipitates in annealed hot-rolled band is 1-2 order higher than those in hot-rolled band, and the average size in annealed hot-rolled band is about 16 nm smaller than those in hot-rolled band. The microstructure of hot-rolled band is heterogeneous along the thickness and the Goss orientation grains with an intensity of about 2 are mainly in the deformed structures of subsurface. After hot band annealing, the microstructure along the thickness is more homogeneous and uniform and fine grains of subsurface can be obtained, but the intensity of Goss texture decreases to about 0.8.