Image Credit: NASA/JPL-Caltech
For additive manufactured components the material differs depending on thickness of parts, printing strategy and design for 3D-printing. Due to the material complexity of 3D-printed components, conventional test methods might be misleading. Therefore adapted test methods needs to be applied in order to test and verify functionality for each type of component. Proper test methods will therefore be evaluated.
Structural characterization of 3D-printed parts
Characterization on built parts can roughly be divided into three categories:
Simulation: (Pre-building, non-destructive), deciding component strength and aspects for printing. Often used as an iterative loop-tool during the design phase.
Topological/Morphological: (shape) Manufactured component has intended shape?
Mechanical: What is the performance of the manufactured component?
Investigation of heat treatments for AlSi10Mg and 316L
In a report by FMT, tensile tests where made on heat treated and non-heat treated test bars. From analysis it becomes clear that processing of one series of test bars where not representative. Inspection revealed unmelted powder particles remaining inside the structure. This is in turn caused by insufficient layer recoating. Heat treating lowers stress from building, increases break strain and especially toughness, but lowers tensile strength.