Etude des mécanismes de déformation du titane T40 en formage incrémental

Abstract : The single point Incremental Forming (SPIF) process is an emerging method of sheet metal forming. Unlike to conventional processes which are usually expensive due to tooling and equipment, SPIF involves a small punch with regard to the dimensions of the part and the forming is achieved by piloting the trajectory of the punch. The main obstacle in the development of this technology lies in the difficulty of obtaining precise geometries. The objective of this work is to bring a better understanding of the process, by an original dual experimental approach that aims to link the forming of the part by FI with the microstructural response of the material, here a pure titanium T40. The mechanical and kinematic approach of the process is based on one hand on the measurement of kinematic fields using digital image correlation on the parts surface, and on the other hand on the measurement of the forming forces throughout the forming. Various global strain states of the formed part and local strain state induced by the punch have then been highlighted. Besides, development of strain in the material and forming forces have been linked to several forming parameters. Microstructural analysis of strained sheets were performed using scanning (SEM) and transmission electron microscopy (SEM-TEM and X-rays diffraction (XRD). Electron backscatter diffraction (EBSD) characterization of microstructures highlighted twinning as an accommodation of the process generated strain, the activated twinning systems and their occurrence depending on the strain orientation and level. Observation of the dislocations arrangements in TEM allowed revealing another microstructural signature of the IF on T40.
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Yannick Balcaen. Etude des mécanismes de déformation du titane T40 en formage incrémental. Génie mécanique [physics.class-ph]. Institut National Polytechnique de Toulouse - INPT, 2013. Français. ⟨tel-00934317⟩

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