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Research Article
Edward Kinzel
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556
Corresponding Author
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Recoil pressure is a critical factor affecting the melt pool dynamics during Laser Powder Bed Fusion (LPBF) processes. Recoil pressure depresses the melt pool, providing layer-to-layer fusion without introducing porosity. If the recoil pressure is too low, the process operates in a conduction mode where layers will not properly fuse, while excessive recoil pressure leads to a keyhole mode, which results in gas porosity. Direct recoil pressure measurements are challenging because it is localized over an area proportionate to the laser spot size producing a force in the mN range. This paper reports a vibration-based approach to quantify the recoil force exerted on a part in a commercial LPBF machine. The measured recoil force is consistent with estimates from high speed synchrotron imaging of entrained particles, and the results show that the recoil force scales with applied laser power and is inversely related to the laser scan speed. These results facilitate further studies of melt pool dynamics and have the potential to aid process development for new materials.
Keywords
Recoil pressure, Laser Powder Bed Fusion (LPBF), melt pool dynamics, aid process development
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CURRENT STATUS: Under Review
Version 1
Posted 17 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 23 Mar, 2021
Reviews received
Received 22 Mar, 2021
Reviews received
Received 12 Mar, 2021
Reviewers agreed
On 07 Mar, 2021
Reviewers agreed
On 04 Mar, 2021
Reviewers invited
Invitations sent on 04 Mar, 2021
Editor assigned
On 04 Jan, 2021
Editor invited
On 15 Dec, 2020
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On 15 Dec, 2020
First submitted
On 10 Dec, 2020
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Subject Areas
Mechanical Engineering
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This preprint is under consideration at Scientific Reports. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Edward Kinzel
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 17 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 23 Mar, 2021
Reviews received
Received 22 Mar, 2021
Reviews received
Received 12 Mar, 2021
Reviewers agreed
On 07 Mar, 2021
Reviewers agreed
On 04 Mar, 2021
Reviewers invited
Invitations sent on 04 Mar, 2021
Editor assigned
On 04 Jan, 2021
Editor invited
On 15 Dec, 2020
Submission checks complete
On 15 Dec, 2020
First submitted
On 10 Dec, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Mechanical Engineering
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Recoil pressure is a critical factor affecting the melt pool dynamics during Laser Powder Bed Fusion (LPBF) processes. Recoil pressure depresses the melt pool, providing layer-to-layer fusion without introducing porosity. If the recoil pressure is too low, the process operates in a conduction mode where layers will not properly fuse, while excessive recoil pressure leads to a keyhole mode, which results in gas porosity. Direct recoil pressure measurements are challenging because it is localized over an area proportionate to the laser spot size producing a force in the mN range. This paper reports a vibration-based approach to quantify the recoil force exerted on a part in a commercial LPBF machine. The measured recoil force is consistent with estimates from high speed synchrotron imaging of entrained particles, and the results show that the recoil force scales with applied laser power and is inversely related to the laser scan speed. These results facilitate further studies of melt pool dynamics and have the potential to aid process development for new materials.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
The full text of this article is available to read as a PDF.
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