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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 3    March 2016

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Microstructure & texture evolution and magnetic properties ofhigh magnetic-induction 6.5% Si electrical steel thin sheetfabricated by a specially designed rolling route
LI Hao-ze(李昊泽)1, LIU Hai-tao(刘海涛)1, 2,LIU Zhen-yu(刘振宇)1, WANG Xiang-long(王项龙)1, LUO Zhong-han(骆忠汉)3, ZHANG Feng-quan(张凤泉)3, CHEN Sheng-lin(陈圣林)3, HUANG Jing-wen(黄景文)3, WANG Guo-dong(王国栋)1

1. State Key Laboratory of Rolling and Automation (Northeastern University), Shenyang 110819, China;
2. Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, China;
3. National Engineering Research Center for Silicon Steel (Wuhan Iron & Steel (Group) Corp), Wuhan 430083, China

Abstract:Electrical steel sheets with 6.5% (mas fraction) Si with good shapes and superior magnetic inductions were successfully produced by a specially designed processing route including ingot casting, hot rolling and warm rolling both with interpass thermal treatment, and final annealing. The sheets were of 0.2 mm and 0.3 mm thick over 140 mm width. A detailed study of the microstructural and textural evolutions from the hot rolling to annealing was carried out by optical microscopy, X-ray diffraction and electron backscattered diffraction. The hot rolled sheet characterized by near-equiaxed grains was dominated by the mixture of <001>//ND fiber (λ-fiber), <110>//RD fiber (α-fiber) and <111>//ND fiber (γ-fiber) textures owing to the partial recrystallization and strain induced boundary migration (SIBM) during the hot rolling interpass thermal treatment. The static recovery and SIBM during the warm rolling interpass thermal treatment result in large and elongated warm rolling grains. The warm rolling texture is dominated by obviousλ, Goss and strong γ-fiber textures. The application of the interpass thermal treatment during hot and warm rolling significantly enhances the impact of SIBM during annealing, which is responsible for the formation of the moderate λ-fiber, some near-λ fiber texture components and the obviously weakened γ-fiber texture in the annealed sheet, leading to a higher magnetic induction compared to the commercially produced 6.5% Si steel by chemical vapor deposition (CVD).

 

Key words: 6.5% Si electrical steel; microstructure; texture; magnetic property

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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