About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Physics-Guided Thermal History Control to Improve Part Quality in Laser Powder Bed Fusion Additive Manufacturing |
Author(s) |
Prahalada K. Rao, Alex Riensche, Kaustubh Deshmukh, Antonio Carrington, Mihir Darji, Kevin Cole, Kevin Cole, Yuri Plotnikov, Kyle Snyder, John Sions |
On-Site Speaker (Planned) |
Prahalada K. Rao |
Abstract Scope |
In this work, we devised an autonomous physics-based controller to maintain the thermal history within a desired window by optimizing the processing parameters layer-by-layer. This approach is a form of digital feedforward model predictive control. To demonstrate the approach, five thermal history control strategies were tested on four unique part geometries (20 total parts) made from stainless steel 316L alloy. The layer-wise control of the thermal history significantly reduced variations in grain size, and improved geometric accuracy and surface finish. This work provides a pathway for rapid, shape-agnostic qualification of LPBF part quality through control of the causal thermal history as opposed to expensive and cumbersome trial-and-error parameter optimization. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |