| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-143: Residual Stress Mitigation in Metal Additive Manufacturing Using Compositional Engineering |
| Author(s) |
Aleksandra L. Vyatskikh, Baolong Zheng, Umberto Scipioni Bertoli, Enrique J. Lavernia, Julie M. Schoenung |
| On-Site Speaker (Planned) |
Aleksandra L. Vyatskikh |
| Abstract Scope |
Broad application of additive manufacturing (AM) has been hindered by a lack of fundamental understanding of the formation and evolution of process-related defects, notably porosity and residual stress. Common residual stress mitigation approaches, including in situ heating, adaptive scanning strategies, and post process annealing, are unable to fully eliminate residual stress. We demonstrate a complimentary residual stress mitigation strategy based on compositional engineering. We use gas atomization to synthesize custom Fe-Cu alloyed powders with varying Cu content. We then use Laser Engineered Net Shaping (LENS®) to fabricate AM samples. We investigate residual stress by employing XRD and hole drilling methods. Using this approach, we study the influence of composition on residual stress in the AM parts. We employ optical microscopy, SEM/EDS, EBSD, XRD and TEM to investigate the resulting microstructure and composition. Our findings suggest that compositional engineering is a feasible strategy to efficiently mitigate the residual stresses in AM. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |