About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
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Presentation Title |
Understanding Melt Pool Variation Due to Geometric Features and Scan Pathing |
Author(s) |
David Scott Anderson, Shawn Hinnebusch, Haolin Zhang, Praveen Siva Vulimiri, Alaaeldin Olleak, Albert C. To, Xiayun Zhao |
On-Site Speaker (Planned) |
David Scott Anderson |
Abstract Scope |
Melt pool variation in laser powder bed fusion printing processes is a potential source of porous defects that are inconsistent and difficult to model. To better understand the effects of laser scan pathing and local geometric features on residual heat and melt pool variation, simulations were conducted using PAMSIM (Pittsburgh Additive Manufacturing SIMulation), a GPU-based finite element method simulation tool and validated against in-situ monitoring data. From these simulations, a predeposition temperature is extracted based on the occurrence of a local minima in the thermal history of a given point prior to laser scanning. This metric for residual heat is correlated with changes in melt pool depth, which indicates transitions to and from a potential “keyhole” or overheating melt pool regime. From these results, a correlation between residual heat accumulation (due to local geometric features and scan vector length) and the corresponding melt pool geometry is presented. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |