| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
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| Presentation Title |
STEM/SEM Study on the Microstructural Evolution and Deformation Mechanisms of Fe-25Cr-20Ni-1.4Nb-0.2C Steel Fabricated by Laser Powder-bed Fusion |
| Author(s) |
Kinga A. Unocic, Rangasayee Kannan, Lisa M Debeer-Schmitt, Ken Littrell, 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), fabricated by laser powder-bed fusion (LPBF), contains a refined microstructure with a high-density cellular structure, nano-sized carbides (e.g., NbC, Cr23C6), and < 5 nm clusters of Cr-Ni-Fe that are localized at the cell walls. Larger carbides are usually found along the main grain boundaries. Some local chemical heterogeneities due alloy processing could affect its local mechanical properties and oxidation behavior. Therefore, it is important to establish a link between the as fabricated microstructure and mechanical behavior. Selected samples after high temperature creep testing were examined and various advanced characterization techniques were performed to understand the effect of temperature and stress on microstructural evolution and deformation mechanisms. The deformation mechanism and microstructure stability will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, High-Temperature Materials |