ON THE CORRELATION OF MAGNETOCRYSTALLINE ENERGY AND BARKHAUSEN NOISE IN API 5L STEELS: A STOCHASTIC MODEL

Tu-Le Manh – Francisco Caleyo – Jose M. Hallen –
Jose A. Pérez-Benítez – Jose H. Espina-Hernández

   A stochastic model has been developed to explore the experimental correlation between magnetocrystalline energy and Barkhausen noise in the region from saturation to remanence in low-carbon steels. The proposed model helps evaluate the an-gular dependence of magnetocrystalline energy in API 5L steel samples from their crystallographic texture, grain orientation, and grain boundary misorientation distribution. These microstructural characteristics are used to model the distribution of free magnetic charges at grain boundaries in the steel. The statistical distribution of magnetic free poles leading to the nucleation and growth of reverse domains is computed for a large number of grain boundaries from the material's texture, considering the magnitude and direction of the applied field; this is used to estimate the Barkhausen activity at each angular position of interest. The model is validated against magnetocrystalline energy predictions made from X-ray texture and Barkhausen noise measurements.

Keywords: Barkhausen noise, magnetocrystalline energy, non-destructive method, stochastic modelling

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