| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
2025 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-84: Reversing Conventional Wisdom: Discovery of Welded Joints with Superior Cryogenic Strength-Ductility Over Base Metals |
| Author(s) |
Yoona Lee, Jeong Min Park, Dongwon Shin, Wei Xiong, Marcia Myung Hye Ahn, Namhyun Kang |
| On-Site Speaker (Planned) |
Yoona Lee |
| Abstract Scope |
The reduced load-bearing capacity of welded joints compared to base metals (BM) in cryogenic environments presents an intrinsic obstacle to designing reliable structural components. For the first time, we present a counterintuitive approach to exploit the typically undesired heterogeneity in welding science to achieve welds with superior strength-ductility surpassing BMs. Compositional heterogeneity encourages the matrix to become more metastable face-centered cubic, preferentially promoting deformation-induced martensitic transformation in the weld metal (WM) rather than BM. Additionally, spatial heterogeneity in metastability between WM and BM triggers a gradual progression of martensite transformation from WM to BM. Consequently, an outstanding strength-ductility synergy is achieved with strength (104%) and ductility (140%) compared to BM, surpassing most reported alloys. Our welds can overcome the long-standing challenges of structural lifespan reduction caused by weld degradation in cryogenic environments. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Entropy Alloys, Joining, Mechanical Properties |