About this Abstract |
| Meeting |
Superalloys 2024
|
| Symposium
|
Superalloys 2024
|
| Presentation Title |
A-5: Development of Novel Ni-Co Base P/M Disk Superalloy by Redesigning Based on Turbine Blade Alloy, TM-47 |
| Author(s) |
Toshio Osada, Makoto Osawa, Yuhi Mori, Ayako Ikeda, Hiroshi Harada, Takuma Kohata, Kyoko Kawagishi |
| On-Site Speaker (Planned) |
Toshio Osada |
| Abstract Scope |
The temperature capability of current state-of-the-art high-pressure disk superalloys is around 700°C. To further improve their temperature capabilities, new disk alloy design approaches with a focus on blade alloy compositions, which was designed for applications at temperatures of above 900°C or higher, may be effective. In this study, novel Ni-Co base disk superalloys were designed based on a combination of Ni-base blade superalloy TM-47 and Co-12.5wt.% Ti, both of which possess a γ-γʹ two-phase structure. First screen results using single crystal casts revealed TM-47 to be a potentially promising candidate as a base alloy for Ni-Co base disk superalloy, while additions of Co-12.5 wt.% Ti to TM-47 was found to improve creep strength of the alloy. A later investigation using P/M alloys revealed that limited additions of Co-12.5wt.% Ti to the base alloy also improves powder manufacturability, phase stability, and high temperature proof stress. Thus, TM-47 M2 (20 wt.% addition of Co-12.5wt.% Ti to TM-47) was selected as a candidate alloy for subscale manufacturing trial. Creep tests at 760 °C/630MPa demonstrated that the selected TM-47 M2 provides superior creep properties compared to other conventional disk superalloys, especially for the 0.2 % creep time, which is a critical property for high pressure turbine disks. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |