CEA-LITEN  is a french state research center developing, amongst others, new materials for 3D printing (metals, ceramics, polymers, composites). In this work, we will focus on L-PBF process (Laser-Powder Bed Fusion). This process is a real revolution in industrial applications permitting manufacturing small to medium series with high level of complexity with increasing productivity .

This position will take place in the frame of MADE 3D European project . This project is dedicated to multimaterial process using L-PBF technology, wich is an actual growing topic in our community . This process permits to enhance actual manufacturing with the possibility to use two materials (bi-material component). The system used in our study is detailed .

The objective of this position is to build and run numerical simulations on such process taking account both thermal and mechanical behavior. ANSYS© software will be used for this work. If many softwares are available for L-PBF process simulations at different scales , bimaterial configuration simulation is still understudied. Simulations will be compared to experimental results, such as microstructure observations , XR-diffraction  or 3D printed samples deflexions.

The first part of the job will consist in a litterature review on L-PBF simulation with in parallel ownership of simulation software. Two simulation scales will be considered in this study. The first one is macro scale simulation at layer scale, with direct layer deposition for each material. Residual stresses will be compared with more detailed simulations already done at micro scale (melt pool scale) as XRD experimental measurements. The second scale will be at several layers scale (segregated layer approach. For that scale, experimental samples deflexions will be compared on manufactured parts. A work on geometry adaptation or new concept samples will be first proposed to take into account bi-material behavior.

De formation Bac+8 (Docteur en simulation et/ou matériaux) , vous recherchez une première expérience professionnelle sous forme de post-doctorat à l'issue de votre thèse.

Bon niveau en anglais indispensable (Oral et écrit)
Une expérience des procédés de fabrication additive métal – notamment LPBF – serait un plus