About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in the State-of-the-Art of High Temperature Alloys
|
| Presentation Title |
C-5: Microstructure of the Solution Heat-Treated MAR-M247 Ni-Based Superalloy Fabricated via Directional Solidification |
| Author(s) |
Dorota Wyrobek, Rafal Cygan, Lukasz Rakoczy, Miroslaw Antosz |
| On-Site Speaker (Planned) |
Dorota Wyrobek |
| Abstract Scope |
Directionally solidified Ni-based superalloys are widely used in jet engines, especially in large-scale and geometrically complex blades. In contrast to the equiaxed grains, the columnar grain structures remove grain boundaries transverse to the main tensile stress axis, enhancing creep resistance by limiting cavitation and cracking along them. The excellent strength of cast Ni-based superalloys at service conditions originates mainly from γ′ precipitates possessing an ordered L12 structure, which is coherent with the disordered γ matrix. However, coarse and irregularly shaped secondary γ′ precipitates, significant volume fractions of the γ-γ′ eutectic phase and strong dendritic segregation within the superalloys inhibit their use directly in the as-cast state. Therefore, efforts need to be made to obtain the appropriate morphology and stereological parameters of the γ′ precipitates. High creep resistance can be reached when the matrix is reinforced with cubic particles in the range of 0.35–0.50 μm. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Characterization, |