Abstract
The use of Ni-based superalloys as structural components of advanced ultra-supercritical steam and CO2 turbines is becoming necessary due to the increasing performance requirements of future power plant designs. Although numerous Ni-based superalloys can respond to the demanding mechanical performance, very few present a combination of high-strength and creep resistance while maintaining good ductility and weldability . Furthermore, the improved performance is often associated with wrought alloys while the fabrication of large castings is the primary target for those applications . With the comparatively lower mechanical properties of cast alloys, new designs based on compositional changes are necessary to allow for the use of Ni-based superalloys in A-USC castings. This lack of performance is primarily associated with the large and inhomogeneous grain size as well as elemental segregation and other casting anomalies. This investigation presents various alloys with compositions within the range of INCONEL® 740 /740H designed to overcome the issues associated with the use of Ni-based superalloys in A-USC castings. Modifications to the chemistry were based on thermodynamic simulations and experimental results. Particular attention was given to reactive element additions, element partitioning, γʹ precipitate phase promoting elements and grain boundary carbides. The effects of the various compositional changes on the tensile and creep properties of INCONEL® 740 /740H will be discussed.
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Acknowledgements
This technical effort was performed in support of the National Energy Technology Laboratory’s ongoing research in advanced alloy development under the RES contract DE-FE-0004000. The authors would like to thank Mr. Keith Collins for microscopy assistance. Mr. Matthew Fortner for metallographic assistance. Mr. Christopher Powell for mechanical testing.
Disclaimer This project was funded by the Department of Energy, National Energy Technology Laboratory, an agency of the United States Government, through a support contract with AECOM. Neither the United States Government nor any agency thereof, nor any of their employees, nor AECOM, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
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Rozman, K.A., Detrois, M., Jablonski, P.D., Hawk, J.A. (2018). Mechanical Performance of Various INCONEL® 740/740H Alloy Compositions for Use in A-USC Castings. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_40
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DOI: https://doi.org/10.1007/978-3-319-89480-5_40
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