Comparison of characterization methods for differently atomized nickel-based alloy 625 powders
Abstract
The deployment of additive manufacturing depends on the quality of the produced part, specifically the absence of internal defects, impurities and compositional gradient. In this paper, differently atomized nickel-based alloy 625 powder particles were systematically characterized with different methods and results were compared. Powder properties were studied to understand the effect of different atomization methods on the properties of the powder particles. Morphology, shape and size of water and argon atomized powders were observed using optical microscopy, scanning electron microscopy and micro-computed X-ray tomography (μCT); μCT with different resolution and sample setup. As expected, water atomized powder particles have irregular morphology in contrast to spherical gas atomized particles. Phase and elemental analysis were conducted with X-ray diffraction and energy dispersive spectroscopy; thermal properties were measured with differential scanning calorimetry. Gas atomized powder shows composition and melting temperature close to nominal bulk alloy 625. Particle size analysis was carried out using sieving, laser particle size analysis and μCT. It is found that the average particle size obtained from μCT depends on scan resolution. Additionally, porosity of the powders was observed in SEM micrographs and investigated in detail using μCT. In conclusion, μCT with higher resolution results in collecting accurate shape, size,more »
- Authors:
-
- Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division. Manufacturing Demonstration Facility
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility. Energy and Transportation Sciences Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Pittsburgh, PA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; Air Force Research Laboratory (AFRL); Commonwealth of Pennsylvania; Department of Defense (DoD)
- OSTI Identifier:
- 1463989
- Grant/Contract Number:
- AC05-00OR22725; FA8650-12-2-7230; C000053981
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Powder Technology
- Additional Journal Information:
- Journal Volume: 333; Journal ID: ISSN 0032-5910
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; powder characterization; Inconel 625; water atomized powder; gas atomized powder; morphology; micro computed tomography
Citation Formats
Mostafaei, Amir, Hilla, Colleen, Stevens, Erica L., Nandwana, Peeyush, Elliott, Amy M., and Chmielus, Markus. Comparison of characterization methods for differently atomized nickel-based alloy 625 powders. United States: N. p., 2018.
Web. doi:10.1016/j.powtec.2018.04.014.
Mostafaei, Amir, Hilla, Colleen, Stevens, Erica L., Nandwana, Peeyush, Elliott, Amy M., & Chmielus, Markus. Comparison of characterization methods for differently atomized nickel-based alloy 625 powders. United States. https://doi.org/10.1016/j.powtec.2018.04.014
Mostafaei, Amir, Hilla, Colleen, Stevens, Erica L., Nandwana, Peeyush, Elliott, Amy M., and Chmielus, Markus. Sat .
"Comparison of characterization methods for differently atomized nickel-based alloy 625 powders". United States. https://doi.org/10.1016/j.powtec.2018.04.014. https://www.osti.gov/servlets/purl/1463989.
@article{osti_1463989,
title = {Comparison of characterization methods for differently atomized nickel-based alloy 625 powders},
author = {Mostafaei, Amir and Hilla, Colleen and Stevens, Erica L. and Nandwana, Peeyush and Elliott, Amy M. and Chmielus, Markus},
abstractNote = {The deployment of additive manufacturing depends on the quality of the produced part, specifically the absence of internal defects, impurities and compositional gradient. In this paper, differently atomized nickel-based alloy 625 powder particles were systematically characterized with different methods and results were compared. Powder properties were studied to understand the effect of different atomization methods on the properties of the powder particles. Morphology, shape and size of water and argon atomized powders were observed using optical microscopy, scanning electron microscopy and micro-computed X-ray tomography (μCT); μCT with different resolution and sample setup. As expected, water atomized powder particles have irregular morphology in contrast to spherical gas atomized particles. Phase and elemental analysis were conducted with X-ray diffraction and energy dispersive spectroscopy; thermal properties were measured with differential scanning calorimetry. Gas atomized powder shows composition and melting temperature close to nominal bulk alloy 625. Particle size analysis was carried out using sieving, laser particle size analysis and μCT. It is found that the average particle size obtained from μCT depends on scan resolution. Additionally, porosity of the powders was observed in SEM micrographs and investigated in detail using μCT. In conclusion, μCT with higher resolution results in collecting accurate shape, size, porosity and morphology of the powder particles. Finally, considering the large number of particles that can be investigated with μCT and ability to observe internal porosity, μCT is found to be an appropriate if not superior substitution for other powder characterization methods such as optical/electron microscopies, sieving and laser particle size analysis if time of characterization is not a concern.},
doi = {10.1016/j.powtec.2018.04.014},
journal = {Powder Technology},
number = ,
volume = 333,
place = {United States},
year = {Sat Apr 07 00:00:00 EDT 2018},
month = {Sat Apr 07 00:00:00 EDT 2018}
}
Web of Science
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