Optimization by deformation effects of the structure and properties of Fe-Si alloys with different texture

Abstract

The influence of the degree of perfection rib crystallographic texture (110)[001] on the effect of reducing the magnetic losses at the local laser treatment and mechanical scribing process of tapes mono-crystals and poly-crystals ribbons of electricaltechnical steel Fe-3 % Si in condition thermo-magnetic treatment (TMT) and stretching have been studied. The samples in the form of single crystals with dimensions of 120 × 10 × 0.2 mm were studied. Their surface (110) was at angles β = 0-6° with the [001] axis and the magnetization vector. Samples of polycrystalline textured steel were used in the form of the most common grades 3409 and 3407. The most used brands 3409 and 3407 were used for samples in the form of polycrystalline textured steel tape. Their thickness was 0.27 mm, and the grain size was 20-30 mm. As a result of these effects, a narrowdomain structure of general strip 180° domains 0.2-0.3 mm in width is formed in steel, change of the type and density of the 180° and 90° domain structures, which leads to a decrease in the velocities of the motion of domain walls, and, consequently, hysteresis and eddy current magnetic losses. A sharp dependence of the effect of decreasing magnetic losses on the degree of perfection of the crystallographic texture was revealed. It is shown that in the case of the different steel texture of (grade 3409 and 3407) after these treatments decrease in total magnetic losses of 18 and 13 %, respectively, and for single crystals with optimum texture when scribing and tension-up to 32-37 %.