About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Microstructure Evolution and Performance of Advanced LPBF Steels Creep Tested at 700°C-800°C |
| Author(s) |
Sebastien Dryepondt, Peeyush Nandwana, Holden Hyer, Amanda Heimbrook, Fred List, Sam Bell, Chase Joslin, Gyan Shankar, Yi-Feng Su, Caleb Massey |
| On-Site Speaker (Planned) |
Sebastien Dryepondt |
| Abstract Scope |
Creep behavior in additively manufactured (AM) austenitic steels remains poorly understood. This study investigates the creep performance of four austenitic steels fabricated by laser powder bed fusion (LPBF) at 700–800°C. HK30Nb and CF8C+ exhibited high creep strength along the build direction but reduced ductility compared to wrought counterparts, with pronounced strength degradation perpendicular to the build. A similar anisotropy was observed in an alumina-forming austenitic alloy, though it demonstrated excellent creep ductility. Enhanced creep strength in all alloys was attributed to nanoscale precipitates at cellular substructure walls, while brittle grain boundary phases limited ductility. To elucidate active creep mechanisms, interrupted creep tests were performed in vacuum on LPBF 316H, capturing strain evolution and creep strain rates via digital image correlation. These findings highlight the critical roles of microstructure anisotropy and phase stability in determining creep behavior of LPBF-fabricated austenitic steels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Iron and Steel |