A model of plastic spin taking in account grain interaction during rolling

A FOURTY,; W SIGNORELLI, J; R. E. BOLMARO

Pittsburgh

Congreso; 15th International Conference on Textures of Materials; 2007

The fragmentation of grains after large and severe deformation processes is an experimental fact that still lacks an easy, computationally economical and fast simulation model. During the last years some attempts to introduce microstructural features have been successful in reproducing a few experimental results. However the price in computer time is high and localization, as seen by experiments as geometrically necessary and incidental dislocation boundaries, is still elusive. On the current paper we implement a Taylor type homogenization model allowing neighbor grains to share deformation rates and spins by simultaneous averaging in coincidence with macroscopic values. We improve a previous co-spin model allowing the whole velocity gradient, of the spin sharing grains, to be compatible with the average deformation field. Misorientation distributions are compared with literature data. The results show the characteristic lognormal distribution with a close match with the experiments until a von Mises strain of 2.0. They are discussed in terms of the microstructural influence on texture development rate and components.