About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
Combinatorial Materials Research for the Development of New Advanced CoNi-base Superalloys |
Author(s) |
Lukas Haussmann, Steffen Neumeier, Andreas Hausmann, Enrico Bergamaschi, Mathias Goeken |
On-Site Speaker (Planned) |
Mathias Goeken |
Abstract Scope |
Nanomechanical testing methods are very well suited to complement combinatorial materials research using diffusion couples. Diffusion couples allow the investigation of the microstructure and the mechanical properties of multiple alloy compositions in a single sample without the need to cast many different alloys. To expand the investigation of mechanical properties on diffusion couples to higher temperatures, indentation creep is a highly suitable technique. In this work, the diffusion couple approach was utilized in combination with a high temperature indentation creep testing technique, using a 25 μm flat punch indenter, to conduct combinatorial investigations on a Co-Ni diffusion couple and on a multinary γ/γ' CoNiCr-base superalloy diffusion couple with increasing Cr content. For the Co-Ni system, the highest room temperature hardness and highest creep resistance at 550 °C was observed between 50 at.% Co to 80 at.% Co. For the γ/γ' CoNiCr-base superalloy CoWAlloy2, an optimum Cr content of 14 at.% has been found. Up to this Cr content the hardness and creep resistance is not altered and the precipitation of undesired phases does not occur. With further increasing Cr content, the γ' volume fraction decreases significantly and undesired W- and Al-rich phases precipitate, leading to an increase in hardness but a deterioration of the creep properties. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |