| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Investigating the Influence of Heat Treatment on LPBF IN718 with Varied Beam Shapes: Insights into Static and Dynamic Mechanical Properties |
| Author(s) |
Matjaz Godec, Črtomir Donik, Irena Paulin, Simon Malej, Bojan Podgornik, Borut Žužek, Danijela Anica Skobir Balantič, Richard Off, Narges Mirsabeigi, Katrin Wudy |
| On-Site Speaker (Planned) |
Matjaz Godec |
| Abstract Scope |
Due to segregation at the cell boundaries, the formation of the Laves phase cannot be avoided in the LPBF process of IN718. Therefore, solution annealing is necessary. It requires a slightly lower temperature than conventionally produced IN718 due to the higher dislocation density that accelerates diffusion. In addition to solution annealing, two-stage ageing forms fine precipitates. When using beam shapes other than Gaussian, achieved through optical modulation in the LPBF process, the melt pool's shape can be significantly altered, enhancing printing speed and reducing microstructural defects. We investigated various beam shapes and linked them to changes in the printed microstructure. Then, we optimised heat treatment and studied recrystallisation, delta phases, and carbide formation using SEM/TEM analysis of the effects of solution annealing temperature. The fine delta phase can further strengthen the microstructure, while carbides, especially MC carbides, can significantly worsen dynamic mechanical properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |