| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials in Energy Environments
|
| Presentation Title |
Advanced LPBF Steels with Superior Tensile and Creep Properties |
| Author(s) |
Sebastien Dryepondt, Holden Hyer, Patxi Fernandez-Zelaia, Kinga Unocic, Rangasayee Kannan, Fred List, Peeyush Nandwana, Caleb Massey |
| On-Site Speaker (Planned) |
Sebastien Dryepondt |
| Abstract Scope |
Three high temperature advanced steels, HK30Nb (Fe-25Cr-20Ni-1.4Nb-0.2C), CF8C+(Fe-19Cr-13Ni-3.5Mn-1Nb-0.23N-0.1C) and an AFA alloy (Fe-22Ni-17Cr-4.5Al) were fabricated by laser powder bed fusion, tensile tested at 20-900°C and creep tested at 700-800°C. The three as-printed LPBF alloys exhibited superior tensile and creep strength compared to cast counterparts. While the build direction had limited impact on the tensile properties, a decrease of the alloys creep strength was measured perpendicular to the build direction. A cellular structure with a high density of nano precipitates in the cell walls was observed for the three alloys, which is the likely explanation for the high creep lifetimes. Fracture of the creep specimens was related to the formation and growth at high temperature of brittle phases at grain boundaries and the elongated grain structure along the build direction led to the observed creep anisotropy. The design of high temperature LPBF steels with outstanding strength will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |