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Start of the AFOTI project (Improvement of the cold forming of titanium alloys)

par Fabien Cazes - publié le

The PRET and SIMEON teams of the MECAMETA axis have just obtained funding from the ANR to carry out the AFOTI project in collaboration with the LEM3 of the University of Lorraine (CNRS UMR7239) and the LGF of the Ecole des Mines de St Etienne (CNRS UMR5307).

This AFOTI project (Improvement of the cold forming of titanium alloys) aims to achieve a coupling between experiments and numerical simulations, allowing to better understand and model the links between microstructural evolutions and final properties of a two-phase titanium alloy, and to propose ways to improve its cold forming process.

The TA3V alloy, which has an intermediate strength between pure titanium and TA6V alloy while offering excellent cold formability and weldability, was chosen as a paradigm because it presents a high variability of microstructures and anisotropy, and has been little studied until now, despite its significant potential for high value-added applications (mainly aeronautics, sport and energy).

Through the implementation of non-standard thermomechanical treatments for this alloy, innovative microstructures will be created and then « digitized » to enable their use in finite element calculation codes integrating crystalline plasticity (CPFEM). In parallel, a multi-scale modeling approach, mainly based on Dislocation Dynamics (DD) will be developed in order to integrate by steps in the crystal behavior law all the microstructural elements that can influence the cold behavior of the material (texture, morphology, phase percentages, distribution of particular grain boundaries, ....).

This project therefore aims both to develop more predictive numerical simulations by integrating physically based constitutive laws, but also, based on the increased knowledge of the behavior of the Ta3V alloy, to propose for this alloy, optimized and relatively energy-efficient forming processes.

Contact : B. Bacroix, DR CNRS, brigitte.bacroix