INVESTIGATION OF THE ALPHA-TEXTURE AND BETA-TEXTURE EVOLUTION OF HOT-ROLLED TI-64 PRODUCTS

The alpha textures and their parent high temperature beta textures of different Ti-64 samples rolled in the beta field were investigated. Th e parent high temperature beta texture was modified by different rolli ng rates. Experimentally, for 30% deformation, the parent high tempera ture beta texture was a partial fibre type texture, characterized by t he [100]//DN and [111]//DN fibres. For 75% deformation, the [111]//DN fibre was lowered and the orientations characterized by the Euler angl es (45 degrees, 0 degrees, 0 degrees) were promoted. In parallel, the deformation beta texture was simulated owing to a rate sensitive Taylo r model in order to draw the main crystallographic features involved i n the high temperature deformation process. It can be seen that the hi gh temperature deformation influenced the inherited alpha texture whic h evolved to a major component described by the Euler angles (0 degree s, 90 degrees, 0 degrees). This evolution can be explained using the c orresponding evolution of the beta texture and the phase transformatio n. As a result, it can be concluded that the deformation in the beta f ield induced a variant selection during cooling down.