About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
A-6: Effect of the Interfacial Strain Anisotropy on the Raft Structure of Ni-base Single Crystal Superalloys and Novel Alloy Design Approach by Controlling the Lattice Misfit and the Elastic Misfit |
Author(s) |
Takuma Saito, Hiroshi Harada, Tadaharu Yokokawa, Makoto Osawa, Kyoko Kawagishi, Shisuke Suzuki |
On-Site Speaker (Planned) |
Takuma Saito |
Abstract Scope |
Enhancing the aspect ratio of the γ′ precipitates in the raft structure of Ni-base single crystal superalloys for high-pressure turbine blades is a fundamental approach to improve the creep resistance at higher temperature and lower stress conditions. To obtain larger aspect ratio, the alloy design strategy to enlarge the lattice misfit between γ and γ′ phases towards negatively larger side has been applied. However, the fundamental driving force for the raft structure formation, “interfacial strain anisotropy”, has been ignored for the alloy design. Here, interfacial strain anisotropy is a difference of the interfacial strain between horizontal and vertical γ/γ′ interface, and this is caused by the interaction of loading stress with the elastic misfit between γ and γ′ phases. In this study, model alloys imply that the aspect ratio is modulated by kinetic factor caused by Re with a presence of interfacial strain anisotropy. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |