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 |
Enhancing the Creep Performance of Ni-Based Superalloy Castings |
| Author(s) |
Martin Detrois, Kyle A Rozman, Stoichko Antonov, Paul Jablonski |
| On-Site Speaker (Planned) |
Martin Detrois |
| Abstract Scope |
Commercial Ni-based superalloys, NIMONIC® 105, Haynes® 282®, INCONEL® 740H® (IN740H) and INCONEL® 617 (IN617), were investigated to assess their performance in creep when compared to their cast and wrought counterparts. Typically, castings are associated with decreases in time to failure as well as creep ductility. Overall, all but IN740H performed well with properties matching or close to those of the wrought products on a Larson Miller plot. Pathways to improve the creep properties of the castings were explored, including computational homogenization heat treatment, custom aging heat treatments as well as alternative casting routes. A fine grain homogenized (FGH) casting approach was developed and improved the creep performance of IN740H by promoting (1) a homogeneous physical grain structure, (2) grain boundary precipitate repartition, and (3) enhanced chemical homogeneity within the ingot. Using this approach, the creep life of cast IN740H was found to be similar to that of the wrought alloy. The FGH technique was investigated on IN617 and revealed that the grain structure had a stronger influence than the grain boundaries phases (compared to IN740H). This was attributed to the testing conditions for this alloy associated with diffusional creep. Overall, the FGH casting slightly outperformed the conventionally cast alloy. However, the FGH approach produced localized micro-porosity that affected the creep performance of a number of specimens. This porosity originated from the more rapid solidification rate involved in the FGH approach. More than 70,000 hours of cumulative in-house creep testing (>8 years) on material manufactured using industry relevant techniques are discussed. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |