Effect of Heating Rate on Recrystallization Behavior in Cold-rolled Ultra-thin Grain-oriented Silicon Steel
WANG Lina1,2, HE Chengxu3, MENG Li4, YANG Jiaxin5,6, ZHANG Ning4, GUO Xiaolong5,6, HU Zhuochao5, LI Guobao5, WANG Fuming1
1 School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Department of Materials Science and Engineering, School of Tianjin, University of Science and Technology Beijing, Tianjin 301830, China 3 State Key Laboratory of Advanced Transmission Technology, Global Energy Internet Research Institute Co., LTD., Beijing 102209, China 4 Central Iron and Steel Research Institute, Beijing 100081, China 5 Baosteel Central Research Institute, Shanghai 200000, China 6 National Engineering Research Center for Silicon Steel, Wuhan 430080, China
Abstract: The effect of heating rate on the recrystallization behavior of ultra-thin oriented silicon steel was analyzed by using EBSD technique. The results show that the nucleation sites and the texture components of recrystallized grains were mainly determined by the deformed microstructure, not significantly affected by heating rate. The nucleation sites of recrystallized grains were observed in the deformed matrix, including the shear bands, grain boundaries between two {111}〈112〉 grains, deformation bands and heterogeneous deformation zones. The preferential recrystallization nucleation is more obvious in the shear bands. Goss({110}〈001〉), {210}〈001〉 and {310}〈001〉 became the main texture in the annealed grain oriented silicon steel sheet, and a certain proportion of hybrid orientation were found. Heating rate was a direct factor which inf-luence the intensity of Goss and the microstructure uniformity. Enhanced recovery by low heating rate reduced the stored energy difference among texture components, which reduced the nucleation advantage of Goss orientation, thus the intensity and sharpness of Goss were weakened. The nucleation advantage of Goss was promoted during high heating rate, sharp Goss texture was strengthened after complete recrystallization. In addition, in case of rapid heating, the average grain size after recrystallization was reduced and the uniform distribution was improved.
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