Studying Field Dependence of Reversible Magnetic Permeability in Plastically Deformed Low-Carbon Steels

Abstract—The field dependences of the signal ${{U}^{\sim }}\left( Н \right)$ across the measuring winding of an induction transducer, which are proportional to reversible magnetic permeability, have been measured in low-carbon St3 steel plastically deformed by stretching under reversal of its magnetization along the major hysteresis loop both when unloaded and under an elastic tensile load. A method is proposed for isolating the contribution rendered to the measured signal by the irreversible displacement of only 90-degree domain walls. The method consists in subtracting the curve ${{U}^{\sim }}\left( Н \right)$ measured under the elastic tensile load of a magnitude sufficient to compensate for internal compressive residual stresses in the sample from the no-load ${{U}^{\sim }}\left( H \right)$ curve. It has been established that the induced magnetic anisotropy field obtained with this method is virtually no different from that produced by the method in which no-load ${{U}^{\sim }}\left( Н \right)$ curves are approximated.