Effect of Twinning and Grain Interaction On Texture Development in Rolled Twip Steel

Melchior, Maxime [UCL] Jacques, Pascal [UCL] Delannay, Laurent [UCL]

TWIP (TWinning-induced Plasticity) steel combines excellent ductility and strength. This is attributed to the formation of very thin twin lamellae which act as barriers against dislocation slip and divide grains into smaller and hence harder sub-grains. This also leads to anisotropic hardening of the slip systems in the parent grain. In the present study, two modelling of the interaction of adjacent grains are tested: (i) the Taylor full constraints (FC) model assuming a uniform deformation and (ii) the ALAMEL model [1]. Slip-twin interaction is modelled by assuming that the hardening of slip systems is increased when their Burgers vector is incident to an active twinning plane. One evaluates the effect of such hypotheses on the prediction of the texture evolution and the volume fraction of twins. Predictions are compared to experimental measurements carried out on a Fe-22W-13C alloys in which mechanical twinning is frequent [2].