Abstract
With the objective of optimizing the crystallographic texture of non-oriented electrical steel, i.e., reducing the 〈111〉//ND and 〈110〉//RD fibers and promoting the 〈001〉//ND texture, a new rolling scheme was proposed and tested, in which the cold rolling direction (CRD) was intentionally inclined at an angle to the hot rolling direction (HRD) in order to change the orientation flow paths during cold rolling and alter the final texture of the annealed sheets. A non-oriented electrical steel containing 0.88 wt pct Si was hot rolled using conventional routes and annealed, and a number of rectangular plates were cut from the hot band with the longitudinal directions inclined at various angles, i.e., 0, 15, 30, 45, 60, 75, and 90 deg, to the HRD. These plates were then cold rolled along the longitudinal directions with a thickness reduction of 72 pct. The cold-rolled samples were annealed, temper rolled and annealed again (final annealing). The texture evolution during hot rolling, hot band annealing, cold rolling, and final annealing was characterized by electron backscatter diffraction and X-ray diffraction techniques. By changing the CRD with respect to the HRD, the initial texture and the orientation flow paths were altered, which resulted in apparent differences in the textures as compared to conventional cold rolling. After temper rolling and final annealing, the recrystallization textures consisted of mainly a 〈001〉//ND fiber and there was almost no 〈111〉//ND fiber. The sample cold rolled at an angle of 60 deg to the HRD had the strongest texture (intensity almost 2× of conventional rolling) with a maximum at the cube {001}〈100〉 orientation—a magnetically favorable orientation for non-oriented electrical steels.
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Acknowledgments
Funding for this work was provided by Natural Resources Canada through the Program of Energy Research and Development (ecoEII ETRI011). United States Steel Corporation Research and Technology Center (Munhall, PA) is gratefully acknowledged for melting, hot rolling, and hot band annealing the steel plates. The authors are grateful to Michael Attard, Darren Bibby, Raul Santos, Renata Zavadil and Pei Liu for their contributions to this project. Peter Badgley from the United States Steel Corporation Canada (Hamilton, ON) is gratefully acknowledged for coordinating this research. Victoria Jarvis, McMaster Analytical X-ray Diffraction Facility, McMaster University, is thanked for the XRD texture measurements.
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He, Y., Hilinski, E. & Li, J. Texture Evolution of a Non-oriented Electrical Steel Cold Rolled at Directions Different from the Hot Rolling Direction. Metall Mater Trans A 46, 5350–5365 (2015). https://doi.org/10.1007/s11661-015-3136-5
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DOI: https://doi.org/10.1007/s11661-015-3136-5