International Conference on Microalloying in Steels date:1998
Development of recrystallization texture in an ultra low carbon (ULC) steel was studied at four (50-90%) different cold rolling reductions. During deformation, a steady increase in ct fibre (RD//< 110 >) was observed, while gamma fibre (ND//< 111 >) increased from 0-50% reduction but then did not change significantly. In the recrystallization texture, however, a steady and significant increase of gamma fibre, but no changes in alpha, was noted with increased reductions. Based on the as deformed state: two physical parameters were identified, which may explain the changes in recrystallization texture with strain. Those being: (1) spacings (as measured along ND) of gamma/alpha oriented deformed bands and (2) relative ability of such bands to form recrystallized grains. An estimation of (2) for different orientations may be obtained from their respective nucleation factors (N-i, defined [6, 12] as the number of grains of a particular orientation per deformed band of the same orientation, measured/estimated along normal direction). Evidently, a decrease in gamma band spacing and/or an increase/decrease in gamma/alpha nucleation factors will strengthen the gamma recrystallization texture. With increased reductions, spacings of the gamma bands decreased - mainly from the geometrical considerations. On the other hand, above 70% reduction, nucleation factors for a bands, especially for I (112)< 110 > component, dropped significantly.