Influence of subsurface layers on texture and microstructure development in RGO electrical steel |
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| Affiliation: | 1. Thyssen Stahl AG, FQP-EB(151), D-4100 Duisburg 11, Germany;2. Institut für allgemeine Metallkunde und Metallphysik der RWTH Aachen, D-5100 Aachen, Germany;1. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Inner Mongolia 014030, China;2. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China;1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei 430081 China;2. National Engineering Research Center for Silicon Steel, Wuhan, Hubei 430080, China;3. Center for Advanced Steels, International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan, Hubei 430081 China;4. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei 430081 China;1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China;2. Key Laboratory of Advanced Structural Materials, Changchun University of Technology, Changchun 130012, PR China;3. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79668, USA;1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA;2. Electrical Steel Research Department, JFE Steel Corporation, Kurashiki, 712, Japan;3. School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164-2920, USA |
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| Abstract: | RGO (regular grain oriented) electrical steel is produced by a two stage cold rolling process with intermediate annealing. In this study the influence of surface layers on the recrystallization behaviour is investigated. By controlled thinning of the sheets at different processing stages surface layers were removed single- and double-sidedly in successive steps of 1/10th of half thickness keeping the final thickness, as well as the 2nd cold reduction, constant. All specimens were processed to the final product relating to standard conditions and texture analysis as well as magnetic measurements being performed, indicating very sensitively any disturbance in Goss-texture development. A deterioration of Goss-texture sharpness only appears if a critical surface layer is removed from both sides of the sheet, no matter the processing stage at which the removal was performed. This result suggests a kind of “texture inheritance” due to a texture profile being present at hot strip with a strong Goss-texture at its surface layer. The observed detrimental effect on secondary recrystallization due to the surface removal can be explained by the texture and microstructure development during the processing of RGO electrical steel. Thus the complete texture and microstructure development was investigated first and explained relating to theoretical models of texture development during deformation and leading to a new understanding of what was called “texture inheritance”. |
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