About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Superalloy IN625 as a Candidate for Additively Manufactured Injectors for Hydrogen Combustion in Power Generation |
Author(s) |
Chantal K. Sudbrack, Kyle A. Rozman, Kristin E. Tippey, Martin Detrois, Lucas M. Teeter, Matthew Searle, Ömer N. Doğan |
On-Site Speaker (Planned) |
Chantal K. Sudbrack |
Abstract Scope |
One key challenge for use of hydrogen fuels as an alternative to natural gas in industrial gas turbines is combustor performance, in particular the fuel injectors, where additive manufacturing enables design flexibility for performance optimization at potentially lower production costs. Both solid solution and precipitate strengthened Ni-based superalloys manufactured by laser powder bed fusion (L-PBF) are under evaluation for candidate down-selection using elevated temperature tensile, creep, low cycle fatigue and hydrogen embrittlement testing. The processing parameters used for the first candidate, superalloy IN625, produced dense parts (porosity <0.04%) for which HIP heat treatment was unnecessary. Solutioning the L-PBF IN625 yielded an equiaxed grain structure with sparsely distributed micron-sized MC carbides. The room and elevated temperature tensile properties were comparable to conventional IN625, and differences mostly correlated to grain size. The mechanical testing and hydrogen embrittlement results are presented and discussed in context of microstructural observations, failure mechanisms, and property requirements. |