| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Alloy Design to Develop New Feedstock Materials III
|
| Presentation Title |
Grain Boundary Engineering of 316L Stainless Steel via Laser Powder Bed Fusion |
| Author(s) |
Matteo Seita, Shubo Gao |
| On-Site Speaker (Planned) |
Matteo Seita |
| Abstract Scope |
Applying conventional grain boundary engineering (GBE) to parts produced using near-net-shape manufacturing processes—including additive manufacturing (AM)—is challenging due to the copious mechanical strain involved. In this study, we present an alternative route to GBE of as-built AM alloys which requires no mechanical deformation. Focusing on laser powder bed fusion of 316L stainless steel, we find that the propensity of the alloy to recrystallize mainly depends on the solidification microstructure—including the cell size and the amount of solute that decorates their interfaces—which may be controlled by tuning the process parameters. By choosing the proper laser scanning strategy, we demonstrate the capability of triggering recrystallisation site-specifically and produce “microstructure architectures” consisting of controlled grain boundary character distributions. The resulting alloys exhibit non-conventional mechanical properties and showcase the additional opportunity offered by AM to design superior materials with complex microstructures. |
| Proceedings Inclusion? |
Undecided |