| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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| Symposium
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2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Multi-physics Modeling of Low-temperature Directed Energy Deposition of Stainless Steel 316L |
| Author(s) |
Kishore Mysore Nagaraja, Dong Qian, Wei Li |
| On-Site Speaker (Planned) |
Kishore Mysore Nagaraja |
| Abstract Scope |
The Directed energy deposition (DED) process is greatly influenced by the ambient temperature at on-site repair. In Northern hemisphere locations, DED is particularly influenced by sub-freezing temperatures. However, its influence on the process is not yet studied. This critical gap is fulfilled in this research through a multi-physics computational fluid dynamics (CFD) modeling of the low-temperature DED of the SS316L powders. The model is validated with test cases: -3°C for sub-freezing and 20°C for room temperature cases using a cryogenic DED platform. The modeling involves powder spray, local melting, rapid cooling, solidification, evaporation, and fluid-gas interactions. The results show, at sub-freezing, the molten pool is ~63% bigger with the maximum temperature reduced by ~9.5%. The deposition saw an increase in width by ~8.6% and height by ~26% than the room temperature case. Overall, the versatile modeling-experimental platform helps study cryogenic DED cases for in-space additive manufacturing. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |