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Numerical simulation software for microstructure evolution

The aim of DIGIMU® is to propose an industrial solution for simulating microstructure changes, at the mesoscopic scale and on Representative Elementary Volumes (REVs), during metal forming processes.

Software derived from Research

DIGIMU® is the result of research projects conducted for more than ten years at the Centre de Mise en Forme des Matériaux (Cemef MINES ParisTech) in collaboration with many industrial stakeholders from the metallurgy, aeronautics and nuclear sectors.

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The full-field approach proposed by DIGIMU® has two main objectives:

  • To simulate local and heterogeneous phenomena that are undetectable to larger order models
  • To improve medium-field models used for industrial part-scale simulations

DIGIMU® generates digital polycrystalline microstructures representative of the material's heterogeneities (compliance with the topological characteristics of the microstructure). The boundary conditions applied to the REV are representative of that experienced by a material point at the macroscopic scale (thermomechanical cycle of the considered point). Based on a Finite Elements formulation, the various physical phenomena involved during metal forming processes are simulated (recrystallization, grain growth, Zener pinning due to second phase particles, etc.).

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Digital polycrystalline microstructure (RVE) generated for a specific location of the workpiece Respect of a given grain size distribution

Major product upgrades

The solutions proposed by DIGIMU® advance hand in hand with the most recent research work.

In the short term:

The first 2D versions of the software will focus on microstructural changes occurring in single-phase structures during heat treatments.

Thermal treatment of a 304L austenitic stainless steel: simulation of the microstructural evolution

The phenomenon of Zener pinning by second phase particles will be modeled without formulating any hypotheses concerning the grain/particle interactions (precipitates explicitly integrated into the EF mesh).

The static recrystallization that may occur following a material deformation step will also be modeled (focus on recrystallized grain seeding and growth in a deformed matrix).

In the medium term:

The next step will allow the simulation of recrystallization phenomena occurring during the deformation step (so-called dynamic recrystallization). Thus, it will be possible to model the microstructural evolution of the entire thermomechanical process. All of these developments will be integrated into a 3D version of the software.

In the long term:

One of the main goals of DIGIMU® is to propose a platform allowing a multi-scale approach: the DIGIMU® full-field simulations will be able to calibrate the medium-field models to be used for macroscopic calculations at all points of an industrial part.

The scope of application and use of DIGIMU® will also expand thanks, on the one hand, to the continual improvements made to the models and, on the other hand, to the new developments in the simulation of additional physical phenomena.

DIGIMU® is also synonymous with technical and digital innovations

Fully automated adaptive anisotropic meshing

In order to improve digital precision and to reduce computation times, the software is capable of providing a precise description of the interfaces (grain boundaries) while using an appropriate number of elements thanks to a fully automated anisotropic meshing and remeshing adaptation technology.

Automatic mesh refinement in the direction normal to the grain boundaries (anisotropic meshing)

Fully parallelized calculations

Like all other TRANSVALOR software, DIGIMU® is built around an optimized high-performance architecture capable of running on one or more cores in order to guarantee maximum processing power.