| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Process-microstructure-behavior Relationships
for Fatigue of Additively Manufactured Al Alloys
|
| Author(s) |
Emine Tekerek, Vignesh Perumal, Alex Riensche, Prahalada Rao, Lars Jacquemetton, Darren Beckett, Harold Scott Halliday, Joseph T. Mckeown, Antonios Kontsos |
| On-Site Speaker (Planned) |
Emine Tekerek |
| Abstract Scope |
Thermal histories associated with extreme heating/cooling rates and temperature gradients in laser powder bed fusion (LPBF) cause complex, process-dependent, material phase changes and a variety of microstructural defects. In this context, the effects of non-equilibrium metallurgy near the meltpool region of the “as-printed” microstructures must be investigated to improve quality control and connect process parameter selection with material behavior. To achieve this goal, direct meltpool observations are first made on an aluminum alloy leveraging a Dynamic Transmission Electron Microscope setup capable of observing the solidification process. Then, thermomechanical process simulations are used to define print geometries optimized for thermal effects. Subsequently, in-situ meltpool measurements are performed during printing using a commercially available co-axial monitoring system. Such measurements are then correlated post-mortem with microscopy and X-ray micro-computed tomography data, to identify defects. Based on this pre-test analysis, the fatigue behavior is then investigated using mechanical testing inside the Scanning Electron Microscope. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Characterization |