About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
The Resilience of Laser Powder Bed Fusion to Power Perturbations |
Author(s) |
Christine Cummings, David Corbin |
On-Site Speaker (Planned) |
Christine Cummings |
Abstract Scope |
Stochastic defect creation in laser powder bed fusion additive manufacturing (AM) limits trust in and reliability of AM parts for critical applications. This work aims to better understand the situations in which defects persist and the situations in which defects self-heal, without auxiliary defect mitigation methods whether post-process or in-situ. Prior research has established that small defects self-heal as subsequent layers are processed. This research investigates how the scale of process anomalies (power perturbations) impacts the persistence and size of formed defects. Process anomalies were seeded at known locations throughout Ti-6Al-4V specimens with layer heights spanning 1-6 layers (0.06-0.36 mm) and diameters ranging from 150-450 µm. Process anomalies as tall as two layers or with a maximum diameter of 150 µm self-healed to a size undetectable using commercial X-ray computed tomography (CT) analytical tools. This research indicates the correlations between process anomalies and resultant defect size. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |