| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
|
| Presentation Title |
High Temperature Laser Powder-bed Fusion Austenitic Steels with Outstanding Creep Strength |
| Author(s) |
Sebastien Dryepondt, Kinga A. Unocic, Rangasayee Kannan, Peeyush Nandwana, Patxi Fernandez-Zelaia, Michael Lance, Lisa Debeer-Schmitt, Ken Littrell |
| On-Site Speaker (Planned) |
Sebastien Dryepondt |
| Abstract Scope |
The formation of sub-grain cellular structures in laser powder bed fusion (LPBF) austenitic steels such as 316L due to extremely fast cooling rates is known to enhance room temperature strength. The nucleation of a high density of nano carbides or carbonitrides in the cell walls also offers the opportunity to develop advanced LPBF high temperature high strength austenitic alloys. 310 and 347-type steels fabricated by LPBF exhibited creep strength at 700-800°C along the build direction three to six times greater than the creep properties of cast counterparts. The lower creep strength observed perpendicular to the build direction was mainly attributed to the elongated grains along the build direction. SEM coupled with image analysis, TEM and in situ neutron SANS experiments were performed to investigate the microstructure evolution at 700-800°C of these non-equilibrium alloys.
This research was sponsored by the DOE EERE Vehicle Technologies Office, Powertrain Materials Core Program |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, High-Temperature Materials |