关键词: 无取向硅钢, 织构, 原位拉伸, AlN析出

Abstract: The texture evolution of a highgrade normalized non-oriented silicon steel was studied using electron backscatter diffraction (EBSD) and field emission scanning electron microscope with an in-situ tensile test machine. Results showed that the grain orientation of the tested steel is mainly composed of (011) \[100\]. Under in-situ tensile stress, the grain orientation transit to crystal orientation such as (233) \[3-1-1\], (112)\[2-41\], (001)\[110\], and (455)\[5-22\]. The texture type of the tested steel gradually transforms from the initial {011}〈100〉 Gaussian texture to the surface texture. The orientation density of Gaussian texture continues to decrease with tensile deformation, and finally transit to {113}〈631〉 texture and {100}〈011〉 rotated cubic texture. In nonoriented silicon steel, due to the orientation relationship between AlN and the matrix, it hinders the slip and deformation of the initial grains with a normal orientation during insitu tensile process. This prevents it from becoming the dominant orientation and plays an important role in the formation of {113}〈631〉 texture and {100}〈011〉 rotated cube texture in the final grains.

Key words: non-oriented silicon steel, texture, in-situ tensile, AlN precipitation