Self-consistent polycrystal modelling of dynamic recrystallization during the shear deformation of a Ti IF steel

The texture variations associated with the occurrence of dynamic recrystall ization (DRX) during the high temperature torsion of a Ti interstitial-free steel were examined. Both texture formation mechanisms of DRX were conside red: i.e. oriented nucleation as well as selective growth. These processes were simulated with the aid of a self-consistent polycrystal model that tak es crystallographic glide and DRX into account and also allows for the grai n shape changes that take place during deformation. To handle the variation s in volume fraction associated with the different orientations caused by D RX, the so-called volume transfer scheme was employed. By comparing the tex ture predictions with the experimental observations, it is shown that the s elf-consistent model reproduces the DRX textures more faithfully than previ ous relaxed constraint models. The results also indicate that the main text ure formation mechanism during DRX is oriented nucleation followed by gener alized growth. By contrast, selective growth, as modelled in terms of coinc ident site lattice rotations or plane matching, appears to be of little imp ortance under the present conditions. (C) 1999 Acta Metallurgica Inc. Publi shed by Elsevier Science Ltd. All rights reserved.