A model for the influence of plastic deformation on Magnetic Barkhausen Noise in carbon steel

In this work, a model for the influence of tensile plastic deformation on Barkhausen Noise is proposed. This model is based on a previous model that allows to explain the influence of magnetizing parameters, applied field frequency and electric conductivity on Barkhausen Noise. In order to analyze the effects of plastic deformation on Barkhausen Noise, the model was modified to include the presence of dislocations tangles, the change of the mean coercivity and the change of local coercive field standard deviation as a function of the tensile plastic deformation. The simulations of the model are compared with Barkhausen signal, obtained from three different steel subjected to six levels of plastic deformation. The experimental results show that the amplitude of Barkhausen signal decreases, the main peak field increases and the signal envelope width increases with the increase of tensile plastic deformation. The simulated Barkhausen envelope shows the same behavior as the experimental envelope considering that the number of dislocation tangles increase, the mean value of the local coercive field increases and the standard deviation of the local coercive field increases with the increase of plastic deformation.