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
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| Presentation Title |
Effect of Composition Variations on Microstructure Evolution in Laser Powder Bed Fusion Nickel Alloy 625 |
| Author(s) |
James Zuback, Saadi Habib, Andrew Iams, Fan Zhang, Jordan Weaver, Lyle Levine |
| On-Site Speaker (Planned) |
James Zuback |
| Abstract Scope |
Nickel alloy 625 was designed as a solid solution strengthened alloy but is known to form various precipitates after solidification-based processes that negatively impact fracture and corrosion properties. Industry has recently taken advantage of the excellent weldability of alloy 625 for use in powder-based additive manufacturing (AM) applications, however, AM introduces many new obstacles to the metallurgical processing of alloy 625. For example, powder feedstocks often contain significant amounts of precipitate forming elements, such as nitrogen and oxygen, that cause the formation of uncommon phases in alloy 625. The near-net shape of AM parts also restricts post-processing methods, as the desired microstructure and properties are often achieved through heat treatment alone. These challenges have been addressed as a part of the 2025 AM Benchmark Test Series, where multiple alloy 625 powder feedstocks with key variations in chemical composition were used to build 3D test specimens with identical laser powder bed fusion AM processing parameters. The printed parts from each build plate were subjected to post-process heat treatments consisting of stress-relief and homogenization. Microstructural features, such as phase fractions, elemental segregation, grain structure and types of precipitates were tracked during the evolution from the as-built condition using high resolution characterization techniques. It is shown that a complex interplay between alloy chemistry and heat treatment parameters leads to radically different microstructures, and the implications for standardization efforts are discussed. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |