| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
|
| Presentation Title |
High Temperature Creep Properties along Concentration Gradients in Superalloys |
| Author(s) |
Lukas Haussmann, Steffen Neumeier, Mathias Göken |
| On-Site Speaker (Planned) |
Lukas Haussmann |
| Abstract Scope |
A high temperature indentation creep approach with a 20 µm cylindrical flat punch has been developed to allow creep measurements on the micrometer scale. We have used this technique combined with a newly developed 1D positioning system, to investigate the concentration gradients of a Co-Ni diffusion couple and a multinary CoNi-base superalloy diffusion couple with increasing Cr content. This approach allows the microstructural and mechanical characterization of many alloy compositions in only one sample. For the Co-Ni diffusion couple it could be shown, that the creep strength at 550°C and the hardness increase up to 50Ni-50Co due to an increasing solid solution hardening. In the Co-base superalloy diffusion couple, a significantly increased content of Cr leads to additional tertiary phases and a decrease of γ′ volume fraction. However, hardness measurements and indentation creep experiments reveal an optimal Cr content for the best hardness, creep and oxidation properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Temperature Materials, Mechanical Properties |