Multiscale Modeling of Recrystallization

Recrystallization (RX) is one of the main mechanisms involved in grain structure evolution. This might be a relatively slow (quasi-static) process or fast-proceeding dynamic process, driven by plastic deformation of the material. In both scenarios, RX proceeds by growth of new grains of low dislocation density which consume the surrounding cold-worked and high-energy microstructure, effectively lowering the level of stored energy in the material.

In this 5-year project, funded by the Swedish Science Council and the Crafoord foundation, a multiscale simulation is established, combining crystal plasticity modeling – to trace evolution of plasticity and texture – with a vertex model, tracing the grain structure evolution. The model is applied to, for example, large scale simulations of sheet metal rolling. Recrystallization, grain growth, particle (Zener) drag on migrating grain boundaries, plastic slip activity and texture evolution are examples of features which are all included in the model.

Grain structure evolution during recrystallization

Project

PhD student: Ylva Mellbin, Division of Solid Mechanics, Lund University.