| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Creep Properties of Advanced Structural Materials
|
| Presentation Title |
Role of Cr Content on Creep-rupture Performance in Alumina-forming Austenitic Alloys |
| Author(s) |
Yukinori Yamamoto, Qing-Qiang Ren, Michael P Brady |
| On-Site Speaker (Planned) |
Yukinori Yamamoto |
| Abstract Scope |
A series of alumina-forming austenitic (AFA) alloys was developed as a new class of heat-resistant ferrous alloys which incorporated protective alumina-scale formation for improved oxidation/corrosion resistance in extreme environments. This study focused on the creep-rupture performance of AFA alloys with a variation of Cr content, i,e., Fe-(13.3-17.3)Cr-25Ni-4Al-1.5Nb-0.1C (wt.%), at 850°C and 30MPa to optimize the alloy composition balanced with oxidation resistance. The creep-rupture life of the alloy with 13.3 wt.% Cr was comparable to that of Ni-base alloy 625 at the test condition. However, the rupture-life monotonically decreased with increasing the Cr content. The performance degradation was correlated with the volume fraction changes in strengthening and deteriorating secondary phase precipitates, such as a reduction of B2-NiAl + Laves-Fe2Nb phase content and an increase of Sigma-FeCr phase. The oxidation resistance at 900°C in a water-vapor containing environment will also be discussed for optimization of the alloy composition with balanced properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Iron and Steel, Characterization |