关键词: 电工硅钢, 晶粒尺寸, 晶粒取向, 加工硬化, 圆盘剪分切

Abstract:

Silicon steel sheets with different grain size and orientation are selected to conduct the disc slitting experiment, and the slitting surface morphology and work hardening behavior are studied by analyzing microstructure morphology and micro-hardness. The difference of metallographic structure is great before and after slitting: silicon steel with smaller grain size has larger deformation, while silicon steel with larger grain size is easy to generate the transgranular fracture along with obvious twin structure. The grain size and orientation of silicon steel have a great influence on work hardening. When the grain size is close, the work hardening ability of the non-oriented silicon steel is bigger than that of the grain-oriented silicon steel. When grain orientation of silicon steel is the same, the larger the grain size, the bigger the changing of hardness. The degree of work hardening is directly related to the material deformation in the disc slitting. The fiercer the deformation, the larger the work hardening. Grain orientation of non-oriented silicon steel becomes orderly, which greatly improves the ability to resist plastic deformation. Deformation mechanism of fine granular material is dominated by dislocation slip and the twin deformation mainly occurs in large granular silicon steel.

Key words: electrical silicon steel, grain size, grain orientation, work hardening