About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Twin-Related Grain Boundary Engineering of Additively Manufactured 316L Stainless Steel |
| Author(s) |
Chenglu Tang, Jingfan Yang, Fan Zhang, Joseph W Aroh, E Steven Porterfield, Barton C Prorok, Xiaoyuan Lou |
| On-Site Speaker (Planned) |
Chenglu Tang |
| Abstract Scope |
Twin-related grain boundary engineering (GBE) enhances resistance to boundary-related degradation by introducing a high density of twin boundaries. Conventional GBE requires thermomechanical cycling and is limited to simple geometries. In contrast, laser powder bed fusion (LPBF) enables complex net-shape fabrication but has yet to achieve full twin-related GBE in 316L stainless steel (SS). This study demonstrates, for the first time, complete GBE in LPBF 316L SS using phase transformation engineering and post-build annealing. Two alloy variants were designed to favor austenite-to-ferrite (AF) and ferrite-to-austenite (FA) transformations. AF316L showed minimal twin formation, even after annealing, while FA316L developed extensive twin boundaries and large twin-related domains (TRDs) after annealing. Using synchrotron X-ray diffraction, EBSD, and electron microscopy, we reveal how solidification mode governs twin formation and evolution. These results highlight phase transformation engineering as a viable pathway to achieve deformation-free GBE and enhance AM 316L SS performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Phase Transformations |