| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Microstructural and Mechanical Long-term Stability of AM Materials
|
| Presentation Title |
The influence of part temperature on defects and in situ phase precipitation during LPBF fabrication of Alloy 718 |
| Author(s) |
William J. Frieden Templeton, Shawn Hinnebusch, Seth T. Strayer, Albert C. To, P. Chris Pistorius, Sneha P. Narra |
| On-Site Speaker (Planned) |
William J. Frieden Templeton |
| Abstract Scope |
This work investigates the influence of part temperature on interdendritic porosity and in situ phase precipitation during laser powder bed fusion (LPBF) of Ni-Cr Alloy 718. Specifically, it evaluates how high interlayer temperatures cause interdendritic porosity, and how accumulated exposure to high temperatures during fabrication leads to in-situ precipitation of strengthening phases. Using microstructural and microhardness characterization alongside simulated part temperatures, the study characterizes the impact of process parameters on defects and phase precipitation. Results show that interdendritic porosity formation can be modeled based on process parameters and part temperature, while in-situ phase precipitation can be modeled using isothermal transformation curves and simulated temperature history. The findings highlight process conditions that exacerbate solidification defects such as elevated preheat settings, and suggest methods for in-situ strengthening during LPBF fabrication. By understanding these process-structure-property relationships, the study identifies potential pathways to improve the LPBF processes through defect reduction and part strengthening. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Phase Transformations |