About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing for Energy Industry
|
| Presentation Title |
Improving the Creep Performance of Ni-based LPBF 625 Via Microstructure Control |
| Author(s) |
Sebastien Dryepondt, Holden Hyer, Rahul Franklin, Amir Ziabari, Chase Joslin |
| On-Site Speaker (Planned) |
Sebastien Dryepondt |
| Abstract Scope |
The mission of the Advanced Materials and Manufacturing Technologies program is to accelerate the deployment of novel materials and manufacturing methods for nuclear applications, and extensive work has been conducted on alloy 625 fabricated by laser powder bed fusion (LPBF). Creep testing of low-defect LPBF 625 revealed creep strength at 650°C and 725°C similar to the strength of wrought 625, but the as-printed creep ductility was low perpendicular to the build direction due to the alloy elongated grain structure. After recrystallization at 1150°C for 1h, isotropic creep behavior was observed, with the predominance of grain boundary (GB) cracks oriented at low angles to the applied stress. Interrupted creep testing in vacuum revealed that cavitation initiated preferentially at precipitate-free GBs or between GB precipitates, and X-ray computed tomography imaging was used to quantify GB creep cavity growth rates. Improvement of the LPBF 625 creep performance via microstructure control will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Nuclear Materials |