About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
Symposium
|
Physical Modeling
|
Presentation Title |
Experiment Based Superposition Thermal Modeling of Laser Powder Bed Fusion |
Author(s) |
Cody Lough, Robert Landers, Douglas Bristow, James Drallmeier, Edward Kinzel |
On-Site Speaker (Planned) |
Cody Lough |
Abstract Scope |
The complicated laser scan pathing required to manufacture geometrically intricate parts by Laser Powder Bed Fusion (LPBF) produces significant thermal variance within layers. This thermal variance can locally cause detrimental engineering property inhomogeneity and defects (e.g. porosity) in mission critical parts. Modeling layers’ temperature histories reveals the manufacturing scenarios that could produce those serious defects. Superposition thermal models make this task feasible by quickly simulating a layer’s temperature history. This paper establishes a superposition model based on in-situ thermal camera measurements for pulsed laser LPBF. The model simulates LPBF by superimposing a basis function (i.e. powder bed’s single laser pulse temperature response) inverted from spatiotemporal Short-Wave Infrared (SWIR) data along the laser’s scan path. Case studies of simple and complex layers demonstrate the superposition model’s prediction capabilities and limitations. The model has applications in feed-forward decision making and establishes a baseline for in-situ diagnostics. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |