| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Twin-Related Grain Boundary Engineering of 316L Stainless Steel by Laser Additive Manufacturing |
| Author(s) |
Chenglu Tang, Jingfan Yang, Xiaoyuan Lou |
| On-Site Speaker (Planned) |
Chenglu Tang |
| Abstract Scope |
Twin-related grain boundary engineering (GBE) enhances damage resistance in low stacking fault energy (SFE) materials by promoting high fractions of coincidence site lattice (CSL). Traditional methods use thermomechanical treatments to achieve high twin fractions, but this has not been demonstrated in laser additive manufacturing (AM).
We explored twin formation during rapid solidification and twin evolution during post-AM heat treatment. Dislocation subgrain structures formed during laser AM, while providing primary driving force towards recrystallization, inhibit sparse grain nucleation and sluggish grain boundary migration, which are keys to achieve GBE in low SFE materials. Fine-tuning 316L stainless steel (SS) compositions and laser parameters is necessary to increase CSL fractions in as-built condition. This starting condition significantly influenced the twin evolution during post-AM annealing, forming twin-related domains (TRDs) that disrupt the random boundary network. A few mechanisms will be discussed. These findings provide new insights into twin-related GBE during laser additive manufacturing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Nuclear Materials, Iron and Steel |