| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Additively Manufactured Alloys
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| Presentation Title |
Microstructural Evolution and Oxidation Behavior of Fe-25Cr-20Ni-1.4Nb-0.2C Steel Fabricated by Laser Powder-bed Fusion |
| Author(s) |
Kinga A. Unocic, Marie Romedenne, Peeyush Nandwana, Sebastien Dryepondt |
| On-Site Speaker (Planned) |
Kinga A. Unocic |
| Abstract Scope |
A high temperature austenitic stainless steel (Fe-25Cr-20Ni-1.4Nb-0.2C) was fabricated by laser powder-bed fusion (LPBF), which produces refine microstructure and can result in local chemical heterogeneities that could affect oxidation behavior. A detail microstructural characterization of as-build steel revealed that random grain boundaries mainly contained large elongated NbC and some Cr-rich carbides. Within the sub-grain cellular structure mainly nanoscale NbC were observed. The steel oxidation behavior was compared at 650ºC and 700º
C in air+10%H2O and at 800C in air with the oxidation behavior of similar wrought austenitic steels. The impact of as printed surface finish and evolution of the microstructure on the oxide products will be discussed.
This research was sponsored by the U.S. Department of Energy, Energy Efficiency & Renewable Energy, Vehicle Technologies Office, Propulsion Materials Program. Microscopy performed as part of a user project at the Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility and US DOE, Office of Nuclear Energy, Fuel Cycle R&D Program and the Nuclear Science User Facilities. |
| Proceedings Inclusion? |
Planned: |