About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Using Process Monitoring Signals to Identify Defects during Laser Powder Bed Fusion |
Author(s) |
Nicholas Calta, Jean Baptiste Forien, Gabe Guss, Saad Khairallah, William Smith, Philip Depond, Manyalibo Matthews |
On-Site Speaker (Planned) |
Nicholas Calta |
Abstract Scope |
In situ process monitoring tools are a powerful approach for quality assurance in laser powder bed fusion to compliment post-build inspections. While such approaches provide a great deal of information about process stability, detailed links between process monitoring signals and defect formation remain challenging to quantify. In this talk, I will describe efforts to correlate high speed melt pool thermal emission measurements to defects in an octet truss microlattice. We correlate high speed pyrometry measurements over two wavelength ranges, 500 – 900 nm and 1500 – 1700 nm, to the presence of intentionally introduced defects. From these correlations, we develop a metric to predict the probability that a given strut is defective. We also use finite element modelling and high-speed thermal and optical imaging to describe the physical mechanism that underlies this correlation. Prepared by LLNL under Contract DE-AC52-07NA27344. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |