Next Article in Journal
Additive Manufacturing of Metallic and Ceramic Components by the Material Extrusion of Highly-Filled Polymers: A Review and Future Perspectives
Next Article in Special Issue
Corrosion Behavior of Heat-Treated AlSi10Mg Manufactured by Laser Powder Bed Fusion
Previous Article in Journal
Microstructure and Corrosion Resistance of Laser-Welded Crossed Nitinol Wires
Previous Article in Special Issue
Femtosecond Laser Texturing of Surfaces for Tribological Applications
Open AccessArticle

The Application of Globular Water-Atomized Iron Powders for Additive Manufacturing by a LENS Technique

1
Faculty of New Technologies and Chemistry, Military University of Technology, 2 Urbanowicza Str., 00-908 Warsaw, Poland
2
Department of Mechanical and Mechatronics Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. W., Waterloo, ON N2L 3G1 Canada
3
Rio Tinto Metal Powders, 1655 Route Marie-Victorin, Sorel-Tracy, QC J3R 4R4 Canada
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 843; https://doi.org/10.3390/ma11050843
Received: 23 April 2018 / Revised: 11 May 2018 / Accepted: 16 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Laser Materials Processing)
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. View Full-Text
Keywords: additive manufacturing; LENS technique; globular powder; water atomization additive manufacturing; LENS technique; globular powder; water atomization
Show Figures

Figure 1

MDPI and ACS Style

Durejko, T.; Aniszewska, J.; Ziętala, M.; Antolak-Dudka, A.; Czujko, T.; Varin, R.A.; Paserin, V. The Application of Globular Water-Atomized Iron Powders for Additive Manufacturing by a LENS Technique. Materials 2018, 11, 843.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop