| The dependence of magnetic properties such as core loss and peak permeability on the temper rolling process has been studied in a semi-processed, cold rolled magnetic lamination (CRML) steel. The results indicate that temper rolling parameters such as temper mill extension and roll roughness have a significant influence on the magnetic properties. Material processed with high temper mill extension and smooth work rolls shows a sharper texture, which results in highly anisotropic peak permeability values between the rolling direction and the transverse direction. Texture analysis suggests that temper rolling with both high extension and smooth work rolls may concentrate strain at the surface, which would explain the development of the rolling texture at the surface.; The present work also attempts to determine the mechanisms governing the grain growth process that occurs during lamination annealing of a cold-rolled, motor-lamination steel. A new simulation approach linking a Monte Carlo model, with EBSD scans used as input, has been employed to incorporate the effects of crystallographic texture on the simulated grain growth process. The results indicate that an uneven distribution of stored energies on the sample surface in the temper rolling caused selective growth of less deformed grains during the QDA. The deformation texture in the temper rolling was responsible for the uneven distribution of stored energies. Growth of the Goss grains during the QDA were due to the their advantageous orientation having a relatively less deformed state in the temper rolling. |
