The powder’s characteristics inﬂuence the quality and mechanical properties of the end part.
Diﬀerent types of powders dedicated to the various additive manufacturing processes.
Material Selection Considerations
• Deﬁnition of speciﬁcations in compliance with the end-use application and materials
• Characterization of the powder and validation of a given process
• End part before post-treatment and control
Key metal powder characteristics for additive manufacturing
- Chemical composition
- Powder size distribution (PSD)
- Physical properties
How to characterize the powder’s microstructure?
- Observing the morphology with a Scanning Electron Microscope
- Checking the chemical composition: elemental analysis (EDS, X-ray ﬂuorescence), ICP
- Identifying the size distribution: screening, laser granulometer
- Flow capacity: Hall Flowmeter, FreemanFT4
Usual powders for metal additive manufacturing
- Aluminum alloys: AlSi10Mg, AlSi7Mg, AlSil2
- Titanium alloys: Ti6Al4V
- Steel: 316L, 17-4PH, 15-5PH
- Nickel-based alloys: Inconel 625, 718, 939, 738, Hastelloy X
- Cobalt Chrome: CoCr
Why choose a spherical powder for powder bed processes?
- Increase particle density
- Expand packed density and compactness of the powder bed
- Improve the capacity of powder ﬂow
Usual powders for thermoplastics additive manufacturing
- Acrylonitile butadiene styrene (ABS)
- Polylactic acid (PLA)
- Polyvinyl alcohol (PVA)