Role of in-grain shear bands in the nucleation of 〈111〉 //ND recrystallization textures in warm rolled steel

Electron Back Scattering Diffraction (EBSD) analysis was carried out on warm rolled Ti-IF and low carbon (LC) steels. The aim of this study was to learn more about the formation of grains with a 〈111〉 axis parallel to the sheet normal (ND fibre grains) during annealing. In-grain shear bands were found to be more prevalent in the deformed microstructure of the IF steel than in that of the LC grade. Consequently, the deformed ND fibre grains were far more fragmented in the IF material. These fragmented ND fibre grains produced ND fibre oriented nuclei in the grain interiors during annealing. It is concluded that the relative absence of in-grain shear banding in the warm rolled LC material is the most likely reason for the absence of an ND fibre recrystallization texture in this steel. It is also postulated that in-grain shear bands are involved in the nucleation of the near {554} 〈225〉 textures that are often observed in cold rolled and annealed IF and LC product.