| Annealing of a Fe-3.2%Si sheet having the primary recrystallized texture was performed with and without a high magnetic field in order to clarify the effect of magnetic field on microstructure orientation. Experimental parameters were heating rates(5, 15℃/min), annealing temperatures(700, 800, 1,000℃) and cold-rolling rate(70%). Magnetic field(5 T) was applied in a direction parallel to the rolling direction. Distributions of orientation and misorientation of secondary recrystallization grains were characterized with ODF and EBSP analyses. Magnetic field annealing was found to enhance the selectivity of {001} axis alignment and to suppress {111} axis orientation in the secondary recrystallized microstructure. The effectiveness of magnetic field annealing was more predominant in the condition of a lower annealing temperature of 800℃ and a higher heating rate of 15℃/min and deformation. However, the effect of magnetic field annealing was almost disappeared when annealed at 1,000℃, even in the cold-rolled sheet. It was also found that magnetic field annealing promoted the formation of high angle boundary having 45° grain orientation and CLS grains in secondary recrystallization texture. As a cause of selective formation of {100} texture in secondary recrystallization, magnetostriction induced by applying a magnetic field is suggested. |
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