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The evaluation of ammonia/hydrogen combustion on the H permeation and embrittlement of nickel-base superalloys

Kovaleva, Marina, Dziedzic, Dominik, Mashruk, Syed, Evans, Sam ORCID:, Valera Medina, Agustin ORCID: and Galindo-Nava, Enrique 2022. The evaluation of ammonia/hydrogen combustion on the H permeation and embrittlement of nickel-base superalloys. Presented at: American Society of Mechanical Engineers, Rotterdam, Netherlands, 13 - 17 June 2022. Proceedings of ASME Turbo Expo 2022. ASME, p. 82239. 10.1115/GT2022-82239

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Recent studies exploring ammonia as a green hydrogen energy carrier have established its suitability for a variety of combustion technologies including gas turbines, furnaces, and internal combustion engines. Of significant interest are ammonia/hydrogen blends, which possess combustion benefits over pure ammonia, including an extended stability range and higher laminar burning velocity. Despite the extensive research to characterise the flame properties of these blends, very few studies explore the suitability of existing materials for the manufacture of ammonia/hydrogen combustors. The present study evaluates the impact of ammonia/hydrogen flame chemistry on the H permeation and possible loss of ductility of nickel-superalloys through exposing the samples to pure methane and ammonia/hydrogen flames at atmospheric pressure for a 5-hour period. The effect of the two flame compositions on the materials are compared through thermal desorption analysis (TDA) and room temperature tensile testing. The results showed that exposure to ammonia/hydrogen combustion environments led to hydrogen being absorbed by the nickel superalloys but a possible variation in ductility is influenced by the combustion conditions. Furthermore, the formation of an oxide layer was shown to likely impact the hydrogen absorption rate of the materials. This work shows that ammonia/hydrogen flame chemistry on combustor materials should not be ignored and warrants further studies on material’s mechanical and environmental stability controlled by nitrogen and hydrogen species permeating at industrially relevant conditions.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: ASME
Date of First Compliant Deposit: 23 June 2022
Last Modified: 27 Jan 2023 02:12

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