About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
Inhomogeneous Microstructural Evolution of Two Phase Ni-Base Superalloy Under Induction Heat-Treatment |
| Author(s) |
Yonguk Lee, Victoria Miller |
| On-Site Speaker (Planned) |
Yonguk Lee |
| Abstract Scope |
Heteroepitaxial recrystallization (HeRX), nucleation of coherent γ grains at a primary γ’ particle, has many potential avenues for microstructure control in Ni-base superalloys. HeRX phenomena has been studied only under hot deformation near the solvus temperature, limiting our understanding of its formation and impact on final microstructure under inhomogeneous strain and temperature conditions during processing and in-service. In this study, steep gradients of strain and temperature were induced to elucidate their effect on the frequency and growth of HeRX grains in a polycrystalline Ni-base superalloy, ATI 720. More frequent HeRX formation and reduced annealing twin density were observed at intermediate temperature than near solvus temperature. The findings suggest that the role of primary γ’ particles can vary, either to be HeRX source or annealing twin source, depending on the annealing temperature, indicating more precise grain structure control for the improved fatigue-life can be achieved using HeRX phenomena. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, High-Temperature Materials, Sustainability |