Microstructure of grade 2 titanium after KoBo deformation have been investigated. Orientation map have been collected by SEM/EBSD technique from longitudinal cross section of sample. The microstructure differs substantially from one observed in transverse cross section, due to highly anisotropic conditions of KoBo deformation. Curled grains observed in transverse section are replaced by heavily elongated grains in longitudinal section. Elongated grains are grouped in clusters and separated by high angle grain boundaries. Similarly to transverse cross section clusters of elongated grain are accompanied by areas of more strongly refined grains with shapes closer to equiaxed ones.
Similar microstructure have been observed in cold rolled titanium, however there are importatn differences. First are curled grains which are not observed in CR titanium and second are twins which are almost completely absent after KoBo deformation, while in cold rolling are one of most important deformation mechanisms leading to characteristic microstructure.