Evolution of magnetic properties and crystallographic texture in electrical steel with large plastic deformation

Abstract

Deformation leads to a hardening of steel due to an increase in the density of dislocations and a reduction in their mobility, giving rise to a state of elevated residual stresses in the crystal lattice. In the microstructure, one observes an increase in the contribution of crystalline orientations which are unfavorable to the magnetization, as seen, for example, by a decrease in B 50, the magnetic flux density at a field of 50 A/cm. The present study was carried out with longitudinal strips of fully processed non-oriented (NO) electrical steel, with deformations up to 70 resulting from cold rolling in the longitudinal direction. With increasing plastic deformation, the value of B50 gradually decreases until it reaches a minimum value, where it remains even for larger deformations. On the other hand, the coercive field Hc continually increases. Magnetometry results and electron backscatter diffraction results are compared and discussed. © 2011 American Institute of Physics.