| 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)
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| Presentation Title |
Application of In-situ Process Monitoring to Optimise Laser Parameters during the L-PBF Printing of Ti-6Al-4V Parts with Overhang Structures |
| Author(s) |
John Power, Owen Humphreys, Mark Hartnett, Darragh Egan, Denis P Dowling |
| On-Site Speaker (Planned) |
John Power |
| Abstract Scope |
The development of laser powder bed fusion (L-PBF) has allowed for increased flexibility and complexity of designs over other manufacturing methods. Overhang structures are a common challenge in L-PBF, as they can lead to print defects, e.g. porosity, due to the decreased thermal conductivity of the powder below the print layer, which causes overheating in the overhang meltpool. In-situ process monitoring, which involves real-time monitoring of the printing process, has been shown to be effective in detecting and correcting overhang defects. By controlling the laser energy during the printing of L-PBF overhang structures, the level of porosity and roughness can be significantly reduced (an 88% reduction in Ra roughness was achieved), while the microstructure can be optimised. This result was achieved by monitoring the meltpool temperature (based on photodiode IR measurements). Informed by these measurements, the laser treatment energy is closely controlled to prevent overheating the overhang print layer’s meltpool. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |