Deterministic defect generation in selective laser melting: parametric optimization and control

Olivier Andreau (1) , Patrice Peyre (2) , Jean-Daniel Penot (1) , I Koutiri (2) , C Dupuy (2) , E Pessard (2) , N Saintier (2)

1 LMC (CEA, LIST) - Laboratoire Méthodes CND (CEA, LIST)
2 ENSAM - École Nationale Supérieure d'Arts et Métiers

Selective Laser Melting (SLM) is a powder based additive manufacturing process where parts are made layer-by- layer from a 3D file (STL). The complexity of a part is not a barrier in SLM, and thus the process opens new doors to design and elaborate intricate and complex shapes. This study focuses on the deterministic defect/pore generation SLM –i.e. leaving precisely unmelted powder zones in an SLM part on purpose. In order to get a high accuracy and part reproducibility, a thorough parametric optimization is required, especially for the laser contour scan, which determines both the roughness outside a part and the geometry inside a deterministic defect. Different sets of parameters must be used for the contour and hatch scans, in order to obtain a minimum porosity amount in the solid area while getting a minimal deformation around the pores. The deterministic pore generation gives new tools to characterize and develop new NDT techniques or simulate casting defects. Those pores could also be integrated in novel multifunctional materials, to implement damage detection (structural health monitoring) or to attain better thermal properties while still keeping good mechanical performances.

Mots clés: SLM; Contour; Pore; Defect; NDT; additive manufacturing: L-PBF

Domaines: Physique [physics]

Olivier Andreau, Patrice Peyre, Jean-Daniel Penot, I Koutiri, C Dupuy, et al.. Deterministic defect generation in selective laser melting: parametric optimization and control. WLT: Lasers In Manufacturing, Jun 2017, Munich, Germany. ⟨hal-04526250⟩