| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Remelting-Informed Grain Engineering in Laser Powder Bed Fusion |
| Author(s) |
Tianyi Lyu, Yu Zou |
| On-Site Speaker (Planned) |
Tianyi Lyu |
| Abstract Scope |
In laser powder bed fusion, the combination of strong directionality of thermal gradient and repetitively similar solidification conditions usually results in bulky columnar grains and undesired strong texture. A popular approach to offset such unwanted features is through the alteration of process parameters, but detrimental side effects might appear along. In this study, we demonstrate a new strategy that controls microstructure and texture by the extent of remelting induced by melt pool overlaps. Using 316L stainless steel, we tune grain morphology and grain size without global or local adjustment to energy density and scan pattern. The key is the survival/elimination of the newly nucleated grains at a melt pool during the formation of subsequent melt pools, which depends on the scale of the overlap since grain nucleation has a locational propensity at free surfaces. This facile strategy is universal and paves a new avenue for grain engineering in additive manufacturing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Process Technology |