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 |
Creep Performance and Microstructural Evolution of Gas Metal Arc Directed Energy Deposition Haynes 230 |
| Author(s) |
Dominic Piccone, Dan McConville, Jonah Klemm-Toole |
| On-Site Speaker (Planned) |
Jonah Klemm-Toole |
| Abstract Scope |
Large components for high temperature structural applications in power generation applications have long manufacturing lead times, which can negatively impact the ability to quickly obtain replacement parts. Large scale high deposition rate additive manufacturing processes, such as gas metal arc directed energy deposition (GMA-DED), have the potential to quickly produce large components for the power generation industry, but the high temperature mechanical performance must be understood. In this work, the creep performance of GMA-DED Haynes 230, a solid solution and carbide strengthened Ni based superalloy commonly used in power generation, was evaluated at 760 °C and compared to other forms of the alloy. It was found that the overall creep performance was lower than that of laser powder bed fusion and wrought Haynes 230 reported in the literature. An analytical rupture time model was employed to understand the factors leading the lower performance of GMA-DED, and it was found that the higher minimum creep rate (lower creep strength) is the primary contributor to reduced creep life. The lower creep strength of GMA-DED may be due to residual microsegregation of tungsten and chromium that negatively affect solid solution and carbide precipitation strengthening, respectively. The results of this work show that more investigation into the microstructural features that affect creep strength are needed to employ GMA-DED Haynes 230 for high performance high temperature applications. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |