| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Opportunities for grain boundary engineering via laser powder bed fusion of 316L stainless steel |
| Author(s) |
Sophie Primig, Ming Luo, Nima Haghdadi |
| On-Site Speaker (Planned) |
Sophie Primig |
| Abstract Scope |
Grain boundary engineering (GBE) is a promising approach for improving any grain boundary controlled properties of polycrystalline materials. Traditionally, GBE requires repeated deformation and heating cycles to induce recrystallization, and this is therefore not directly applicable to near-net-shape parts fabricated through additive manufacturing (AM). To address this challenge, an alternative approach involves adjusting the strain energy introduced during AM to generate the required driving forces for recrystallization. We explore the effects of processing parameter variations (i.e., scan speed, laser power and scan strategy) on the as-built microstructure and subsequent recrystallization response of laser powder bed fusion processed 316L stainless steel. We show that variations in recrystallization response can be linked to differences in the density of geometrically necessary dislocations and chemical heterogeneity. We also show an example for site-specific control of GBE using a novel concentric scanning strategy, that will potentially enable the design of gradient microstructures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Process Technology |