| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development III -- Super Materials and Extreme Environments
|
| Presentation Title |
Laser Powder-bed Fusion Austenitic Steels with Superior Creep Resistance |
| Author(s) |
Sebastien Dryepondt, Peeyush Nandwana, Kinga A. Unocic, Patxi Fernandez-Zelaia, Ying Yang, Rangasayee Kannan, Yousub Lee, Fred List |
| On-Site Speaker (Planned) |
Sebastien Dryepondt |
| Abstract Scope |
It is well known that extremely fast cooling rates during laser powder-bed fusion (LPBF) can result in materials with unique microstructures. For 316L stainless steel fabricated by LPBF, the formation of sub-grain cellular structure with high dislocation density has been linked to superior tensile properties. This cellular structure offers also a new route for the development of high temperature LPBF steels with the nucleation of nanoscale strengthening precipitates in the cell walls. High temperature 310 and 347-type steels were, therefore, fabricated by LPBF. Fine NbC precipitates were found at the cellular walls leading to high yield strength at temperatures up to 900C. The creep lifetimes of the LPBF 310-type steel at 700-800C were ~3 times and ~1.5 times higher than the creep lifetime of cast 310 along and perpendicular to the build direction, respectively. The steel microstructure evolution at high temperature with and without an applied stress will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, High-Temperature Materials |