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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.

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Processes

 

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Grain growth

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Recrystallization

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Hardening, recovering

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Nucleation, nuclei growth

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Zener pinning

Software derived from Research

DIGIMU® is the result of research projects conducted for more than ten years at the CEMEF (Material Forming Center) in collaboration with many industrial stakeholders from the metallurgy, aeronautics and nuclear sectors. The two pillars of DIGIMU® software development are the extensive experimental work and the constant improvement of existing numerical methods, which allow CEMEF to be at the forefront of world research in the field.

MSR CEMEF Mines
Microscopy of a nickel-based alloy carried out by the MSR group, CEMEF MINES Paris-Tech

The full-field approach

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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Specific features

  • Documented procedure to identify growth and recrystallization parameters
  • Unique AAA remeshing (automatic - adaptive – anisotropic)
  • Model recrystallization phenomena occurring during metal forming processes
  • Intuitive graphical user interface
  • High parallel computing compatibility
  • Continuous flow from the DIGIMU industrial chair research results

Technical and numerical 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.

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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.

DIGIMU 3D polycrystal simulationSome features have also been recently integrated into DIGIMU®:
  • Polycrystal deformation
  • Dynamic (DRX), post dynamic (PDRX) and static (SRX) recrystallization
  • 3D simulation
  • Recovery of the thermomechanical paths of the simulation
  • User routines to define your own hardening, restoration or nucleation laws
  • Coupling with FORGE® software: using FORGE® sensors to feed DIGIMU® simulations and analyze the evolution of the microstructure in the critical points.

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Major future upgrades

In the short term:

  • Taking into account the grain boundary anisotropy
  • Taking into account the evolution of second phase particles during the simulation
  • Deepening of the hardening, recovery and nucleation laws
  • Expansion of the materials database

 In the long term:

  • Crystal plasticity
  • Phase change simulation
  • Continuous recrystallization
  • Reduction of computation times due to specification and improvement of remeshing tools

 

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Industries

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DIGIMU® for the aerospace

Our software provides assistance in the development of high performance alloys and parts through the prediction of microstructural phenomena.

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DIGIMU® for steelmaking

DIGIMU® allows to understand which metal alloys to use and the impact of the treatments applied to them.

industrie-energy

DIGIMU® for the energy

Simulation helps to control industrial risks related to the microstructure of the materials and their applications.

 

Competitive advantages

 
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Predicting grain growth

Anticipate your grains size driven by capillarity forces, and stored energy gradient at the interfaces.

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Modeling hardening, recovery and recrystallization

Simulate polycrystal deformations, hardening and recovery, nucleation, and following nuclei growth. Follow static, dynamic and postdynamic recrystallization.

user routines

Integrating user routines

Import your models to define your own hardening, recovery and nucleation laws.

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Support by our teams

Let’s work together hand in hand. DIGIMU® users get the support they need when using our software.

 
 

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