Full field modeling of dynamic recrystallization in a CPFEM context – Application to 304L steel

A new finite element approach to model microscale strain localization within olivine aggregates

“…Thus, in order to describe the mechanical behavior of a polycrystal, a homogenization scheme has to be used in combination with the CP computations. The homogenization technique used in this work is the crystal plasticity finite element method (CPFEM) in which each element of the FE mesh is considered as a crystallite (Sarrazola Ruiz et al, 2020). The CP equations are then solved on each element of the mesh between each FE resolution.…”

“…This formalism allows the polycrystal to be described using signed distance functions (LS functions) representing the distance to the GB and are defined as positive inside the grain they represent and negative elsewhere. In order to reduce the number of LS functions needed to describe the aggregate, we use global LS (GLS) functions representing several non-neighboring grains (Scholtes et al, 2015). The displacement of the GLS is computed within a 3D FE framework using an isotropic mesh composed of P1 (associated with linear interpolation functions) tetrahedral elements with a typical mean size of 3 µm.…”

“…Here we present a global FE framework describing the mechanical behavior of deforming olivine aggregates by a CP model in which we incorporate a relaxation mechanism representing non-dislocation glide strain-accommodating mechanisms. The microstructural evolutions, including grain boundary migration (GBM) driven by capillarity and stored energy, solute drag, and nucleation, are computed within the FE framework through the level-set (LS) approach (Scholtes et al, 2016(Scholtes et al, , 2015Furstoss et al, 2018). This whole numerical framework constitutes a global tool for the modeling of olivine polycrystal deformation and also allows discrimination between creep regimes controlled by grain interiors or by grain boundaries.…”

Modeling of the Dynamic Recrystallization of Ti Microalloyed High‐Strength Steel

“…Equation (10) shows that the material constant n can be determined from the slope of the plot lnε : Àlnsinh (ασ) at a given deformation temperature. The range of n in the peak state (n p ) for the experimental steel is 4.4À5.…”

“…To give full play to the precipitation strengthening effect of Ti, more Ti needs to be dissolved into the matrix. [6][7][8][9][10] Therefore, increasing the heating temperature of the casting billet or directly rolling the billet is usually adopted. However, the initial austenite grains of the directly rolled casting billet or high-temperature austenitized casting billet are extremely coarse.…”