About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Powder-Based Manufacturing and Repair of Large Structural Components for Critical Applications
|
| Presentation Title |
Extremely Low-Temperature Tensile Behavior of 316L Stainless Steel Additively Manufactured by Laser Powder Bed Fusion |
| Author(s) |
Haeum Park, Heechan Jung, Min Young Sung, Young-Kyun Kim, Jaimyun Jung, Yoona Lee, Namhyun Kang, Kyung Tae Kim, Young-Sang Na, Seok Su Sohn, Jeong Min Park |
| On-Site Speaker (Planned) |
Haeum Park |
| Abstract Scope |
This study investigates the tensile behavior of laser powder bed fusion (LPBF)-fabricated 316L stainless steel (SS316L) at 4.2 K, compared with a homogenized counterpart. The LPBF-fabricated sample possesses a hierarchical heterogeneous microstructure, including solidification cells and dislocation networks, whereas the homogenized sample shows a fully recrystallized, homogeneous grain structure. These microstructural differences lead to distinct deformation responses at extremely low temperatures. The LPBF-fabricated SS316L exhibits more intense discontinuous plastic flow (DPF) behavior with larger stress drops during early deformation, attributed to frequent dislocation interactions and mechanical instability. Despite a lower tendency for deformation-induced martensitic transformation (DIMT) due to high dislocation density, the LPBF sample still shows more severe DPF than the homogenized sample. This highlights the critical role of the LPBF-driven microstructure, particularly the dense dislocation network, in promoting DPF at cryogenic temperatures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |