About this Abstract |
| Meeting |
11th International Symposium on Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Symposium
|
Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
|
| Presentation Title |
Effect of Microstructure Parameter on Grain Growth Behavior of Ni Based Superalloy |
| Author(s) |
Naoya Kanno, Yuya Nagami, Nobuyasu Tsuno |
| On-Site Speaker (Planned) |
Naoya Kanno |
| Abstract Scope |
Microstructural control, especially grain size optimization, is crucial for enhancing the properties of Ni-based turbine disks. This study investigates the influence of both microstructural and deformation factors on grain growth in powder metallurgy Ni alloys subjected to super solvus heat treatment. The results show that grain growth cannot be explained solely by Zener pinning from gamma prime particles or carbides; rather, the formation of annealing twins and changes in the volume fraction of pinning particles play dominant roles. Grain growth rates varied significantly with forging temperature, correlating with both the fraction of twin boundaries and the intragranular gamma prime volume fraction. These findings highlight the importance of balancing the driving force for grain growth due to deformation, strain energy reduction by twin formation, and pinning by precipitates in controlling grain growth. Based on these results, a process design approach for high-strength Ni-based alloys is proposed. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |