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| INFLUENCE OF COLUMNAR GRAINS ON THE COLD ROLLING TEXTURE EVOLUTION IN Fe-3%Si\ ELECTRICAL STEEL |
| ZHANG Ning, YANG Ping, MAO Weimin |
| School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
ZHANG Ning YANG Ping MAO Weimin. INFLUENCE OF COLUMNAR GRAINS ON THE COLD ROLLING TEXTURE EVOLUTION IN Fe-3%Si\ ELECTRICAL STEEL. Acta Metall Sin, 2012, 48(7): 782-788.
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Abstract Columnar grains exist in nearly all cast slabs of Fe-3%Si electrical steels, their morphological and crystallographic anisotropies strongly influence the microstructure and texture evolution during following hot rolling, cold rolling and final annealing. This work investigates the rolling texture and microstructure of the specimens with columnar grains initially arranged along different directions by means of XRD and EBSD techniques, and the effects of columnar grain boundaries are analyzed. The results show that at intermediate rolling reduction, all three types of specimens show to different extents the inheritance of {001} texture, or in other words, they prevent effectively the formation of {111} texture. The {001} texture is strongly retained in ND specimen (with initial columnar grains' longitudinal axis being along normal direction) and TD specimen (with initial columnar grains' longitudinal axis being along transverse direction), whereas {111}<112> texture is the strongest in RD specimen(with initial columnar grains' longitudinal axis being along rolling direction). In addition, rotated cube and {111}<110> textures develop in TD specimen. All three types of specimens demonstrate an orientation rotation path from cube {001}<100> over 20o rotated cube {001}<130> to {113}<251>, which is in contrast to the conventional rotation path from α fiber to $\gamma$ fiber in equiaxed polycrystalline electrical steels. In spite of the significant difference in grain boundary arrangement in the three types of specimens, their influence on texture formation is limited because of the large grain sizes and the influence is mainly related with initial orientations. To understand rolling texture evolution of columnar grain specimens is of great significance in the development of new type electrical steels with strong {001} texture.
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Received: 24 October 2011
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