Evaluation of recycled materials from TA6V alloy machining chips consolidated by Fabrication Additive
Context : The TYREX project (Titanium recycled by grinding and shaped by new processes) aims to study and develop different ranges of powder production processes from chips and demonstrate their compatibility with the requirements of processes and applications. Even if today there are industrial sectors and projects relating to the treatment of short cycle waste in the industry (by melting), the recycling of machining chips of this type of alloy in the form of powders is much more complex and is not addressed. This project intends to deal more specifically with these points using the additive manufacturing technology SLM (Selective Laser Melting) as the technique for the final consolidation of recycled powders. Indeed, this technique is well mastered at LISL (partner laboratory) and allows to reduce the inventory of material required (recycled powders) for the manufacture.
In order to demonstrate the potential of the proposed solutions and their economic and scientific interest, we first propose to study the recycling of “clean” chips obtained by dry and / or cryogenic machining. Mecachrome will supply these chips and 2 recycling paths will be studied. The first will consist in grinding these shavings to transform them into powders. The second way will consist of making chip compacts which will be atomized later (compaction and atomization conditions to be defined and optimized). The powders obtained by these 2 routes will thus be used to produce specimens consolidated by SLM that will be characterized to judge the interest of the solutions proposed. In parallel, definition of optimal densification conditions by SLM will be carried out using commercial powders and will serve as a point of comparison. All the materials obtained will be widely characterized from a chemical, microstructural and mechanical point of view.
To support this work, we are offering a 6-month internship in order to carry out SLM consolidations and all of the characterizations. To this end, the powders and consolidated materials will be characterized by numerous local techniques (MO, microprobe, SEM, chemical analyzer). An initial assessment of the mechanical properties will be obtained by tensile tests of the materials produced.
Although this project is dedicated to TA6V alloy, the methodologies and solutions proposed will be transposable to other alloys with high added value.
CEA de Saclay, Département des Matériaux pour le Nucléaire, Service de Recherches de Métallurgie Appliquée
Master 2 ou 3ième année d’école d’ingénieur métallurgie / matériau
Cédric SAUDER (SRMA/LTMEx) – email@example.com ; Hicham MASKROT (SEARS/LISL) – firstname.lastname@example.org
Internship duration : 5-6 months
Beginning of intership : november 2020 or up to fébruary-March 2021
Payement : ~ range 700-1300 euros