BARKHAUSEN NOISE STUDY OF MICROSTRUCTURE IN GRAIN ORIENTED FeSi STEEL

Jozef Paľa – Jan Bydžovský – Volodymyr Stoyka – František Kováč

   The Barkhausen noise was measured in grain oriented Fe–3%Si steel subjected to different heat treatment conditions. In such a way a set of samples with different microstructure and texture states was created. Hence this set contains samples with different magnetic properties. The measurement results of the Barkhausen noise envelopes for the triangular magnetic field intensity as well as triangular magnetic flux density were compared and the influence of various microstructural properties changed during heat annealing on the Barkhausen noise are discussed. We explored the noise upon the whole hysteresis loop and not only the average statistical properties of the noise; otherwise, a full understanding of the problem is not possible. To better distinguish different “sources” of microstructural changes on character of the envelope we proposed some new approach to its evaluation.

Keywords: grain oriented FeSi steel, Barkhausen noise, microstructure

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