The role of high energy boundaries and coincidence boundaries in the secondary recrystallization of grain-oriented silicon steel

The probability of grains having misorientation angles at 20°–45° (I_HE20–45) or a Σ9 orientation relationship (I_cΣ9) was determined using the three dimensional orientation distribution obtained from the (100) pole figure. A primary recrystallized grain-oriented silicon steel specimen capable of evolving a sharp Goss texture was used. It was found that I_HE20–45 was higher around the Goss orientation but not the highest in the primary texture. Goss orientation has the highest I_cΣ9 in the primary matrix. The assumption that orientations with a higher I_HE20–45 value can be nuclei for secondary recrystallization led to the prediction of secondary recrystallization not being present in the secondary recrystallization texture. However, no such contradictory prediction was made on the assumption that orientations with a higher I_cΣ9 value can be nuclei for secondary recrystallization. It is concluded, therefore, that grains with misorientation angles from 20°–45°are not important in the selection mechanism of Goss secondary recrystallization. This article is based on a presentation made in the symposium “ ’99 International Symposium on Textures of Materials”, held at Sunchun National University, Sunchun, April 21~22, 1999 under the auspices of The Korean Institute of Metals and Materials and The Research and Development Center for Automobile’s Parts and Materials.