| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Bcc-Superalloys
|
| Presentation Title |
Microstructure Evolution and Mechanical Properties of A2/L22-Strengthened Ferritic Superalloys |
| Author(s) |
Christopher H. Zenk, Luis Morales, Kai Eberl, Carolin Körner |
| On-Site Speaker (Planned) |
Christopher H. Zenk |
| Abstract Scope |
Ferritic superalloys are based on the Fe-Al-Ni ternary system and exhibit a coherent bcc-derived α/α′ (A2/B2) microstructure. Comprised of two-thirds Fe and Al by weight, these alloys have a major cost advantage over Ni-base superalloys. The addition of Ti facilitates the partial transformation of α′ into an L22 Heusler phase, referred to as α″. The introduction of these precipitates was shown to improve the creep resistance at 700 °C by four orders of magnitude.
We will present the result of our own alloy development in this field, which led to the alloy FSA2 with high precipitate fraction (~50 %). High-energy X-ray diffraction reveals a complex phase transformation pathway, allowing the design of a large variety of microstructures. High-temperature tensile tests reveal a relatively high yield strength (~ 1 GPa), but poor low-temperature ductility. Various embrittling phenomena play a role at temperatures up to 1000 °C. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Iron and Steel, Phase Transformations |