Analysis method and analysis system of magnetic domain structure of grain oriented electrical steel sheet

摘要

Problem to be solved: to provide a directional electromagnetic steel plate with improved elongation magnetostriction in the high magnetic field region.Solution oriented directional magnetic steel sheets contain a mass% of Si: 2.0 to 7.0%, and the remainder has a chemical composition consisting of Fe and impurities, has a texture oriented in the Goss direction, and an average diameter of the same magnetic domain angular range is 5.0 mm or more.The same domain angle region isFrom the magnetic domain image g of the oriented electromagnetic steel plate digitized by two kinds of colorsMultiple positions of magnetic image GMultiple subregions XNM (k-nsk) corresponding to ML - MSL)A plurality of partial Fourier images are obtained by two dimensional Fourier transformation for each of the partial regions.Spatial distribution of angle of 180.deg. Domain based on peak location of each spot in multiple partial Fourier images θ (nBased on MThe angle of 180 ° domain is derived as a continuous region within a predetermined range.Diagram