About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Special Session
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Presentation Title |
In-situ Thermographic Inspection for Laser Powder Bed Fusion |
Author(s) |
Tao Liu, Cody S. Lough, Hossein Sehhat, Jie Huang, Edward C. Kinzel, Ming Leu |
On-Site Speaker (Planned) |
Tao Liu |
Abstract Scope |
Laser powder bed fusion is strongly influenced by the quality of the powder layer including the powder properties as well as the layer thickness. In particular, thermal stresses can produce sufficient part deformation to the point that a part interferes with the wiper. This paper investigates the use of long-wave infrared thermography to monitor the surface temperature of the build. When cold powder is spread by the recoater, heat diffuses from the underlying part through the powder. The surface temperature history is a strong function of the thermal transport properties of the powder as well as the thickness. This correlation is explored and measured experimentally. It is then used to estimate the powder layer thickness above overhanging parts. This approach is shown to capture the part distortion and predicts wiper state prior to catastrophic interaction with the part. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |