About this Abstract |
| Meeting |
11th International Symposium on Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Symposium
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Superalloy 718 and Derivatives 2026: Legacy, Innovations, and Future Directions
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| Presentation Title |
Microstructural Evolution During Post-Heat Treatment of PBF-LB Manufactured Alloy 247 |
| Author(s) |
Praveenkumar Vijayakumar, Magnus Neikter, Joel Andersson |
| On-Site Speaker (Planned) |
Praveenkumar Vijayakumar |
| Abstract Scope |
The fabrication of gamma prime (γ′) strengthening nickel-based superalloys through additive manufacturing (AM) techniques has taken significant interest from both the industrial and research communities due to their outstanding high-temperature properties. However, high crack susceptibility remains a considerable challenge for nickel-based superalloys with high γ' volume fractions manufactured by laser powder bed fusion (PBF-LB). Effective post-processing, particularly through the post heat treatment (PHT) process, plays a crucial role in shaping the γ′ morphology, size, and minimizing crystallographic anisotropy, which is essential for achieving the desired mechanical properties. However, the microstructural changes and γ′ morphology concerning the low-temperature PHT for PBF-LB fabricated Alloy 247 are not well understood. This study systematically examines the temperatures ranging from 600 to 900° over time intervals of 30 to 180 minutes on the γ′ nucleation, grain sizes, crystallographic texture orientation, and microstructural evolution of PBF-LB fabricated Alloy 247. The microstructure characterization indicates that PHT temperatures below 800 °C do not significantly affect the morphologies. In contrast, when the temperature exceeds 800 °C, there is a notable reformation of the melt pool boundaries and cellular structures. Further, the relationship between the microstructural changes and microhardness has also been investigated. The results of this research reveal the relationship between PHT temperatures and their impact on γ′ morphology. This understanding has the potential to assist the advancement of AM-fabricated Alloy 247 for high-temperature applications.
Keywords: Nickel-based superalloy; Alloy 247; LPBF; Heat treatment; Microstructure; Hardness. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |