| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Bcc-Superalloys
|
| Presentation Title |
A comparison between Cr- and Fe-based superalloys strengthened by hierarchically structured precipitates |
| Author(s) |
Steffen Neumeier, Jan Vollhüter, Mathias Göken |
| On-Site Speaker (Planned) |
Steffen Neumeier |
| Abstract Scope |
Precipitation strengthened iron-based alloys are promising candidates for high-temperature applications. The formation of B2 precipitates through the addition of Ni and Al enhances their mechanical properties, making them interesting candidates for use in aerospace and power generation under challenging conditions. Similar B2-BCC alloys can be also generated based on chromium, which have higher melting temperatures.
In this study, an Fe- and a Cr-based alloy with the addition of Ti was designed, aiming to facilitate the formation of the L21-structured Heusler phase alongside the B2 phase. SEM investigations show that Ti addition does not lead to bulk B2 and L21 phases. In the Cr-based alloy, atom probe tomography reveals nanostructured ordering of B2 and L21 phases within the hierarchically structured precipitates. Mechanical testing under creep conditions of 750 °C demonstrates significantly enhanced creep strength of the Cr-based alloy compared to its Fe-based counterpart, with strength comparable to established Ni-based superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Mechanical Properties, Characterization |