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| Hot deformation microstructure and behavior of silicon steel solidified under low voltage pulsed magnetic field |
| ZHENG Ce1, LI Ying-ju1, TAO Wen-zhe2, LUO Tian-jiao1, YANG Yuan-sheng1 |
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China;
2. Wuhan Iron and Steel Co., Ltd., China Baowu Group, Wuhan 430080, Hubei, China |
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Abstract In order to refine the microstructure of silicon steel ingot and improve its processability, the effect of low voltage pulsed magnetic field (LVPMF) on the solidification structure of silicon steel was investigated, and the hot deformation behavior and microstructure of different as-cast microstructures were compared. The fine grains are obtained by employing the low voltage pulsed magnetic field during the solidification of silicon steel. With the increase of frequency of LVPMF, the ratio of equiaxed grains (area of equiaxed grains to whole area) and average grain size of equiaxed grains was increased firstly and then decreased. In addition, the ratio and average grain size of equiaxed grains increased with the voltage of LVPMF. The average size equiaxed grain is refined to half of grains without LVPMF, and the ratio of equiaxed grains increased from 10% to 100% under optimal LVPMF parameter with frequency of 5 Hz and voltage of 200 V. Hot compression experiments (deformation temperature of 950 ℃, strain rate of 0.01 s-1 and 0.1 s-1) and hot rolling experiments (blooming temperature 1 100 ℃) were carried out for columnar grains solidified without LVPMF and equiaxed grains solidified with LVPMF (frequency of 5 Hz, voltage of 200 V). A small amount of recrystallization grains occurs and strip-shaped grains are formed in the samples solidified without LVPMF with columnar grains after hot compression. The strip-shaped grains are hard to eliminate and deteriorate processing performance of the alloy. The samples solidified with LVPMF with equiaxed grains can be fully recrystallized after hot compression. Therefore, fine recrystallization grains are acquired with average size of 670 μm. By comparing the microstructure and texture of hot-rolled sheets, it is found that the samples with LVPMF with equiaxed grains are more prone to recrystallization during hot rolling, resulting in weaker texture intensity and anisotropy.
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Received: 29 July 2022
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2023, Vol. 58 
