Abstract: Based on research of laser scribed grain-oriented silicon steel, the surface layer damage behavior of grain-oriented silicon steel was studied in this paper. It is showed that the surface layer of grainoriented silicon steel was composed of 1.5 μm insulation layer and 2.5 μm magnesium silicate bottom layer, and the scirbing line with micro-holes composed of bare iron matrix and Mg2SiO4 was formed after laser scribing treatment. In case of low scribing power, the scrbing line formed with a light intermittent mark with a diameter of 50 μm, and no effective scribing line was formed. In addition, the energy and action time of laser light source increased with the increasing of scribing power and reducing the scribing frequency and speed, but the amount of bare iron matrix and Mg2SiO4 and the density of micro-holes inside the scribing line increased, which is harmful to the insulation and corrosion resistance corrosion resistance performance of the product.

Key words: grain-oriented silicon steel, laser scribing, surface layer damage behavior