| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Grain Boundary Engineering of Additively Manufactured Stainless Steel |
| Author(s) |
Shubo Gao, Hu Zhiheng, Chin Kai Siang, Song Xu, Matteo Seita |
| On-Site Speaker (Planned) |
Shubo Gao |
| Abstract Scope |
Grain boundary engineering (GBE) is a processing strategy aimed at increasing the fraction of ∑3 grain boundaries in metals via a sequence of strain-annealing cycles. Despite the positive impact of GBE on the physical and mechanical properties of materials, it is impractical to employ it for the production of advanced alloys due to its high costs and energy requirements. In this study, we propose the integration of GBE in selective laser melting (SLM) processes as a more viable processing route for enhancing materials performance. Our strategy combines the inherent thermal strains induced during SLM with mechanical strains, which may be applied layer by layer during the additive process. Using 316L stainless steel as a case study material, we produce samples with up to 40% ∑3 boundaries. Our study provides the groundwork for designing and developing a hybrid SLM technology that integrates in-situ mechanical deformation capabilities for GBE of structural parts. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |