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Modélisation du procédé de projection laser : Application au Ti-6Al-4V

Abstract : Direct laser deposition technology is an innovative process which allows near net shape part manufacturing directly from computer aided design data. However, local variations of temperature during manufacturing produce heterogeneous microstructures and residual stresses. In order to improve understanding of the process and to predict the residual stresses and strains in the part after manufacturing, a finite element modeling of the process has been developed. The material considered here is Ti-6Al-4V. The manufacture of a single row wall has been considered as a basis for the simulation. A robust method that includes a technique to activate the elements has been implemented in Zset/ZéBuLoN in order to simulate the process. The first step of the finite element simulation is the computation of the thermal fields. The thermal calculations have been successfully calibrated by means of thermocouple measurements. A model taking into account the diffusion of Vanadium through the phases in Ti-6Al-4V has been designed. Morover the process shows different kind of grain structure: columnar or equiaxed. A model relying on solidification map of Ti-6Al-4V has been implemented. These two models have been successfully compared to Julie Maisonneuve’s PhD thesis work. Finally, a mechanical model predicts the residual strains and stresses in the part during manufacturing. This model has been validated by analysing the bending of the substrate in the experiments. It provides a good prediction of the variation of the macroscopic values at stake during the manufacturing of a part with direct laser deposition process and gives acces to the residual fields.
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  • HAL Id : tel-03767643, version 1

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Arnaud Longuet. Modélisation du procédé de projection laser : Application au Ti-6Al-4V. Sciences de l'ingénieur [physics]. école nationale supérieure des mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0080⟩. ⟨tel-03767643⟩

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