关键词: 取向硅钢, 组织, 织构, 低温加热

Abstract: The evolution of microstructure and texture of grainoriented silicon steel with low temperature reheating in experiment had been studied by OM, EBSD and XRD. The experimental results showed that there was an alternating banded structure in which ferrite layers and pearlite layers alternated with each other in hot rolled slab, and the microstructure was inhomogeneous along the thickness direction. The {001}〈110〉, {112}〈110〉 texture and {110}〈001〉 texture in the hotrolled sheet were also inhomogeneous along the thickness direction. After cold rolling, the ferrite grains were severely elongated, forming a fibrous structure elongated along the rolling direction. The texture types of coldrolled sheet were mainly α texture and γ texture; The matrix recoverd and recrystallized during decarburization, the microstructure was a single ferrite equiaxed grain, and the texture was mainly γ texture; After nitriding, the texture of secondary coldrolled sheet only decreased in strength, and the change of texture type was not obvious. The secondary recrystallization developed perfect, and the grain size was about 10-20 mm. The texture type was sharp Goss texture. And the magnetic induction B800 was 1.926 T and the iron loss P1.7/50 was 1.047 W/kg.

Key words: grainoriented silicon steel, microstructure, texture, low temperature reheating