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The Application of Globular Water-Atomized Iron Powders for Additive Manufacturing by a LENS Technique
- Source :
- Materials, Materials; Volume 11; Issue 5; Pages: 843
- Publication Year :
- 2018
- Publisher :
- MDPI AG, 2018.
-
Abstract
- The water-atomized ATOMET 28, 1001, 4701, and 4801 powders, manufactured by Rio Tinto Metal Powders, were used for additive manufacturing by a laser engineered net shaping (LENS) technique. Their overall morphology was globular and rounded with a size distribution from about 20 to 200 µm. Only the ATOMET 28 powder was characterized by a strong inhomogeneity of particle size and irregular polyhedral shape of powder particles with sharp edges. The powders were pre-sieved to a size distribution from 40 to 150 µm before LENS processing. One particular sample—LENS-fabricated from the ATOMET 28 powder—was characterized by the largest cross-sectional (2D) porosity of 4.2% and bulk porosity of 3.9%, the latter determined by microtomography measurements. In contrast, the cross-sectional porosities of bulk, solid, nearly cubic LENS-fabricated samples from the other ATOMET powders exhibited very low porosities within the range 0.03–0.1%. Unexpectedly, the solid sample—LENS-fabricated from the reference, a purely spherical Fe 99.8 powder—exhibited a porosity of 1.1%, the second largest after that of the pre-sieved, nonspherical ATOMET 28 powder. Vibrations incorporated mechanically into the LENS powder feeding system substantially improved the flow rate vs. feeding rate dependence, making it completely linear with an excellent coefficient of fit, R2 = 0.99. In comparison, the reference powder Fe 99.8 always exhibited a linear dependence of the powder flow rate vs. feeding rate, regardless of vibrations.
- Subjects :
- 0209 industrial biotechnology
Range (particle radiation)
Materials science
Morphology (linguistics)
Lens (geology)
02 engineering and technology
water atomization
021001 nanoscience & nanotechnology
Article
Volumetric flow rate
Metal
020901 industrial engineering & automation
visual_art
visual_art.visual_art_medium
globular powder
General Materials Science
Laser engineered net shaping
Particle size
Composite material
0210 nano-technology
Porosity
additive manufacturing
LENS technique
Subjects
Details
- ISSN :
- 19961944
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Materials
- Accession number :
- edsair.doi.dedup.....aa847a0aa9689ad370dcfba74d16a11a