Estudo da textura cristalográfica em um aço de grão não orientado com 3,3% SI via EBSD"

Abstract

This work consists in the analysis of the texture of samples of steel with 3.3wt% Silicon according to the variation of the final annealing temperature. The samples of this electrical steel were 2mm thick after hot rolling and were subjected to intermediate annealing at 1030°C. Then they underwent the first stage of cold rolling, having their thickness reduced to 0,6mm. After that, they underwent another annealing process at 1030°C and a second stage of cold rolling, with thickness reduction to 0,23mm. Finally, the samples were annealed at temperatures which varied from 620°C to1100°C. This thermomechanical processing was carried out at the ArcelorMittal Inox Brasil and the rolling stages were performed in a reversible Steckel. A final annealing at higher temperatures led, as expected, to an increase be the final grain size. It was verified that the fractions in the áreas of fibers e reached lower values to samples which were annealed between 1020 e 1080 °C and that, within these temperature levels, fiber reached higher temperature levels in this parameter. Finally, around a temperature of 1060°C the grain size is 110m. This grain size can be considered excellent to the scope of this study, once that at this point one can verify higher fraction of favorable orientations and lower fraction of unfavorable orientations to the magnetic properties.