EVOLUTION OF LOCAL TEXTURE AND GRAIN-BOUNDARY CHARACTERISTICS DURING SECONDARY RECRYSTALLIZATION OF FE-3-PERCENT SI SHEETS

A study of the evolution of the local texture has shown that the migration rate of special boundaries is higher than that of general boundaries in a polycrystalline materials. The results of the evolution of the local texture are consistent with those related to the anisotropy of grain boundaries migration velocity surrounding the growing Goss grain. Furthermore, it has been taken i nto consideration that, on an average, all grains having an orientation relationship corresponding to that of a special boundary with the Goss grain have the same "texture" effect relative to its growth; these grains have been considered as a texture component belonging to orientations present in the sheet. The amount of grains belonging to this component is much more important than that of the Goss component and their mean grain size is higher than that of {110} 〈001〉 grains: results point out that grain boundaries between these two "components" of texture have a very high diffusivity. In these conditions, the growth model developed by Abbruzzese and Lucke predicts a high growth rate of a small amount of Goss grains to the detriment of the other component: this mode of growth corresponds well to the case of secondary recrystallisation. © 1990.