Preparation of High Silicon Electrical Steel Sheets with Strong {100} Recrystallization Texture by the Texture Inheritan
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INTRODUCTION
ELECTRICAL steel is the key magnetic material which is widely used in transformers, motors, dynamos, and other electrical equipment and devices. Core loss and magnetic induction are the two main standards for evaluating the magnetic properties of electrical steel.[1,2] Reducing core loss is capable to reduce the energy consumption, extend the service lives of the equipment and devices which are shorten due to heating, and simplify the cooling equipment. Improving magnetic induction can reduce the volume of iron-core and promote the miniaturization and lightweight of equipment and devices. Since the easy direction of magnetization in electrical steel is h001i direction, strong h001i texture is favorable to improve the magnetic induction and reduce core loss.[1] Therefore, in the case of transformers (magnetizations along single direction), the electrical steel with h001i texture (i.e., grain oriented electrical steel) tends to reduce energy consumption and noise. However, grain oriented electrical steel is not adequate to the iron-cores of motors, HONGJIANG PAN, Ph.D. Candidate, ZHIHAO ZHANG, Associate Professor, and JIANXIN XIE, Professor, are with Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China. Contact e-mail: [email protected] Manuscript submitted October 4, 2015. Article published online February 17, 2016 METALLURGICAL AND MATERIALS TRANSACTIONS A
dynamos, reactors, etc. (magnetizations constantly rotating in a plane).[3] In such circumstances, non-oriented electrical steel with {100} texture, which has two h001i easy directions of magnetization distributed in the plane of the sheet, is the ideal material.[4–6] Comparing with common commercial non-oriented electrical steels, the non-oriented electrical steel with {100} texture has higher magnetic induction and lower core loss.[7–10] In recent years, Yonamine et al.,[8] Stojakovic et al.,[3] Cheng et al.,[9] and Liu et al.[10] used methods of directional solidification, conventional continuous casting, strip casting, etc. to fabricate normal or high silicon content electrical steel with {100} initial texture, respectively, and the electrical steel sheets with comparatively strong {100} recrystallization texture were obtained by repetitious rolling and intermediate annealing. There were several different explanations for the formation of {100} recrystallization texture in the electrical steel with {100} initial texture after rolling and annealing. According to the studies by Yonamine et al.[8] and Stojakovic et al.,[3] the {100} oriented grains with low deformed stored energy tended to grow by consuming grains with high deformed stored energy through strain-induced grain boundary migration (SIBM), which facilitated the formation of {100} recrystallization texture. In the study by Cheng et al.,[9] appropriate control of rolling and intermediate annealing parameters were the key to the formation of {100} recrystallization texture due to numerous nucleation in deformation bands. Neve
