New Process for the Goss Texture Formation and Magnetic Property in Silicon Steel Sheet by Hot Asymmetric Rolling and An
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INTRODUCTION
THE shear deformation texture in bcc metals is characterized by the Goss orientation, or {110}h001i, which is a highly useful orientation component in grain-oriented silicon steel. The Goss texture in approximately 3 pct silicon steel has been the subject of speculation due to varying scientific and technological points of view. The Goss-textured silicon steel sheet is developed via hot rolling and cold rolling followed by annealing.[1] The Goss texture is formed near the surface layer of a silicon steel sheet when the silicon steel sheet is rolled in the a phase region at elevated temperatures.[2,3] At elevated temperatures, the friction between the sheet and work roll tends to increase with increasing temperature which, in turn, increases the shear deformation and gives rise to the Goss texture.[4] The shear deformation can also be obtained via asymmetric rolling, where the circumferential velocities of work rolls vary, thereby imposing shear deformation and in turn shear
SU KWON NAM and INSOO KIM are with the School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyung Buk 39177, Republic of Korea. Contact e-mail: [email protected] GWANG-HEE KIM is with the School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology and also with Daeshin Metal, Changwon, Republic of Korea. DONG NYUNG LEE is with the Department of Materials Science and Engineering and RIAM, Seoul National University, Seoul 08826, Republic of Korea. Manuscript submitted June 13, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
deformation textures to the sheets via the thickness. Asymmetric rolling is known to occur due to differences in the circumferential velocities of work rolls. These differences were caused by lubrication mismatch, different angular speeds, or different roll diameters.[5] After the asymmetric rolling of metal sheets, the change in microstructure and mechanical properties and modification of the texture were studied, such as Zn alloy,[6] Mg alloy,[7] Cu,[8] Ni alloy,[9] Al alloy,[10] and steel.[11] Um et al.[12] studied the effect of the initial sheet thickness on shear deformation via ferritic rolling of IF steel sheets. IF steel sheets rolled to a 50 pct reduction in thickness at 600, 700, and 800 C without lubrication showed the {110}h001i and {112}h111i textures in the surface and sub-surface layers, respectively. The shear deformation texture in bcc metals is characterized by the Goss orientation, or {110}h001i, which is a very useful orientation for grain-oriented silicon steels, because it gives rise to high magnetic permeability along the h100i direction.[13,14] The Goss texture remains unchanged even after the recrystallization of steel. The phenomenon was discussed according to the strain-energy-release-maximization theory for recrystallization texture evolution.[12] Asymmetric rolling, where the circumferential velocities of work rolls are different, imposes shear deformation and in turn shear deformation textures to sheets via t
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