Projects per year
Abstract / Description of output
The effects of interstitial gas on the spreadability of Inconel 718 powder under conditions relevant to powder-bed fusion additive manufacturing (PBF-AM) are investigated through high-fidelity discrete element method-lattice-Boltzmann (DEM-LB) simulations. Here, a fine computational grid fully resolves the flow of inert gases around each grain. Furthermore, Inconel 718 powder is fully characterised, and the DEM contact models are calibrated via a rigorous procedure devised specifically for metallic powders in additive manufacturing. This procedure involves angle of repose and slide tests, nano-CT imaging, and shear cell experiments. The spreading behavior of Inconel 718 by a blade is then simulated in both vacuum and gaseous environments. The findings reveal that the presence of inert gases increase the amount of deposited powder and the bed thickness. As the blade speed increases, the disparity in powder deposition between gaseous and vacuum surroundings becomes more pronounced. Moreover, it is observed that the newly deposited particles are disrupted by the wake of the blade, given that the gas velocity near the bed can exceed the terminal velocities of most particle size classes in the simulation.
Original language | English |
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Article number | 103737 |
Journal | Additive Manufacturing |
Volume | 75 |
DOIs | |
Publication status | Published - 14 Aug 2023 |
Keywords / Materials (for Non-textual outputs)
- Discrete element method
- Inconel 718
- Lattice-Boltzmann
- PBF
- Powder spreading
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Dive into the research topics of 'The effects of interstitial inert gas on the spreading of Inconel 718 in powder bed fusion'. Together they form a unique fingerprint.Projects
- 2 Finished
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High-Fidelity Modelling Of Power-based Additive Manufacturing Processes
Haeri, S.
1/02/23 → 31/01/25
Project: Research
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Powders by design for additive manufacture through multi-scale simulations
Haeri, S.
29/07/20 → 31/05/23
Project: Research
Research output
- 4 Article
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Force-Chain Finder: A software tool for the recursive detection of force-chains in granular materials via minor principal stress
Ejtehadi, O., Gupta, A., Khajepor, S. & Haeri, S., Apr 2024, In: Computer Physics Communications. 297, 109070.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Analysis of radiation pressure and aerodynamic forces acting on powder grains in powder-based additive manufacturing
Haeri, S., Haeri, S., Hanson, J. & Lotfian, S., 15 May 2020, In: Powder Technology. 368, p. 125-129 5 p.Research output: Contribution to journal › Article › peer-review
Open Access -
Optimisation of blade type spreaders for powder bed preparation in additive manufacturing using DEM simulations
Haeri, S., 30 Nov 2017, In: Powder Technology. 321, p. 94-104 11 p.Research output: Contribution to journal › Article › peer-review
Open Access