THE ROLE OF GRAIN-BOUNDARY-CHARACTER-DISTRIBUTION IN SECONDARY RECRYSTALLIZATION OF ELECTRICAL STEELS

Grain Boundary Character Distributions (GBCD) in grain-oriented electr ical steels were calculated from the Orientation Distribution Function s of the primary recrystallization texture. The probability of a grain boundary having a misorientation angle From 20 degrees to 45 degrees is highest around the Goss grain. The observed difference in GBCD impl ies that the Goss grain is surrounded by the highest number of high-en ergy boundaries. The high-energy boundary has more structural defects, and these are often linked to a high grain boundary migration rate an d a high grain boundary diffusion rate. An explanation of Goss texture development in secondary recrystallization is proposed, based on the property of the high-energy boundary. The role of special Coincident S ite Lattice boundaries is analysed, and we conclude that they do not p lay a significant role in the development of Goss texture. Copyright ( C) 1997 Acta Metallurgica Inc.