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 |
A Process Optimization Framework for Direct Energy Deposition: Densification, Microstructure, and Mechanical Properties of an Iron-chromium Alloy |
Author(s) |
Austin Whitt, Raiyan Seede, Jiahui Ye, Michael Elverud, Matthew Vaughan, Alaa Elwany, Raymundo Arroyave, Ibrahim Karaman |
On-Site Speaker (Planned) |
Ibrahim Karaman |
Abstract Scope |
Achieving high-density parts and targeted build heights using direct energy deposition (DED) can be challenging due to the large number of highly sensitive process variables. This work proposes a robust parameter optimization framework to generate process maps for primary parameters in DED. Single-track experiments are utilized to map the laser power – scan speed – mass flow rate parameter space, and a combination of geometric criteria for hatch spacing and layer height are proposed to determine parameter sets that achieve both targeted build heights and mitigate porosity formation. Specimens with >99% density, excellent dimensional accuracy, and consistent mechanical properties were successfully fabricated over a wide range of process parameters for an Fe-9wt.%Cr (Fe9Cr) alloy, a surrogate for radiation damage-resistant reduced activation ferritic/martensitic (RAFM) steels. This framework will allow for accelerated parameter optimization for novel alloy systems, as well as open the possibility for local microstructure control while mitigating defect formation. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |