Analysis of Texture Evolution in Cold Rolled and Annealed 3Si-Fe (100)011 Single Crystal

摘要

Recrystallized texture of crystalline material often differs from its cold rolled texture. Many theories concerning the mechanism of the texture evolution have been proposed, however, none of them well explains all the reported experimental results. (100)[011] bcc single crystal seems suitable for this study because of its symmetrical characteristic. However, this orientation (100)[011] is well known as a typical orientation that deforms homogeneously during cold rolling and therefore hardly recrystallizes. In this study, by utilizing dynamic strain aging, complete and uniform recrystallization was obtained for the first time in this orientation of single crystal specimen. Following new findings were obtained as a result. Crystal rotations attributed to active slip systems take place during rolling. Such rotations create the local parts that become recrystallization nuclei. Using high resolution EBSP, orientation measurement was successfully accomplished for the most parts of the cold rolled specimen. Such local region was directly observed in the deformation bands after rolling. These results obtained here correspond to "Oriented Nucleation Theory". In addition, in order to investigate the relationship between active slip systems and recrystallized orientation, modified experiments with varied initial orientation were carried out. The change of the stress condition leads to the change of each slip system's activity and resultant recrystallized texture, which agrees with the proposed mechanism.