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Barkhausen Noise and Magnetic Properties of Plastically Deformed Silicon Steels

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5 Author(s)
Baiotto, R. ; Univ. de Caxias do Sul, Caxias do Sul, Brazil ; Gerhardt, G. ; Fukuhara, M. ; Yonamine, Taeko
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We present Barkhausen noise and magnetic measurements on two fully processed, nonoriented electrical steels which had been cold-rolled to thickness reductions of up to 60%. Both coercive field Hc and hysteresis loss Wh show an almost linear increase with thickness reduction up to the highest deformations. These changes are almost fully reversed after vacuum annealing for 2 h at 760°C. The hysteresis loss can be conveniently subdivided into high and low induction components as suggested by recent modelling. Electron back-scatter diffraction (EBSD) shows no texture change during initial phases of cold-rolling. Barkhausen noise measurements were obtained on both cold-rolled and annealed samples. The undeformed material shows a Barkhausen signature consisting of two small peaks which coalesce into one peak upon plastic deformation and thereafter grow steadily. Annealing the material brings back the two-peaked signature. These results are discussed and hypotheses are presented for the behavior of the Barkhausen noise.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 2 )