Authors:
Aurélien Etiemble (1), Sandra Simon (1), Claire Rigollet (1)
1- LabECAM, ECAM Lasalle, Université de Lyon, France
Abstract:
Material extrusion additive manufacturing (EAM) offers a versatile range of applications for various metallic materials. In indirect processes, a mixture of metal powder and a polymer binder is extruded and deposited to shape the layers of the part, analogous to traditional polymer 3D printing. Subsequently, debinding and sintering steps are indispensable to achieve the final metallic component. Each of these stages may induce impurities and defects, significantly impacting geometric tolerances and mechanical properties. These defects such as warpage, shrinkage, porosity, residual carbon, and undesired phases result from complex mechanisms, due to insufficient or heterogeneous loading of feedstock, thermomechanical distortion during printing, partial debinding and inefficient sintering. This presentation will delve into these challenges, mechanisms, and EAM optimization strategies in the case of stainless and tool steels. The influence of feedstock formulation and associated process parameters on defects, microstructure, and resulting mechanical properties will be discussed.
DOI:
https://doi.org/10.59499/EP246281341
