| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Sustainability of High Temperature Alloys
|
| Presentation Title |
Effects of Fe Substitution on CoNi-Based Superalloys |
| Author(s) |
Steffen Neumeier, Andreas Bezold, Mathias Göken |
| On-Site Speaker (Planned) |
Steffen Neumeier |
| Abstract Scope |
Polycrystalline CoNi-based superalloys are renowned for their excellent creep properties at 750 °C, attributed to a high fraction of L12-structured precipitates and local phase transformation strengthening. However, due to cobalt's status as a strategic and relatively expensive element, there is a need to reduce its concentration without significantly compromising the material's properties.
This study investigates the effects of substituting iron (Fe) for cobalt (Co) in the highly creep-resistant CoNi-based superalloy CoWAlloy1 on its microstructure and mechanical properties. Results show that increasing Fe content leads to a continuous decrease in the liquidus, solidus, and solvus temperatures. Additionally, the precipitate fraction and yield strength are slightly reduced in Fe-containing alloys. Despite a decrease in creep strength with higher Fe content, the alloys still demonstrate comparatively good creep properties. This suggests potential for further development of advanced high-strength CoNiFe-based superalloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, High-Temperature Materials, Mechanical Properties |