Effect of Atmosphere and Sample Thickness on Kinetics, Microstructure, and Compressive Stresses of Chromia Scale Grown on Ni–25Cr

Dirk, Simon; Gorr, Bronislava; Christ, H.‐J.

doi:10.1007/s11085-016-9702-4

Cited by 17 publications

(2 citation statements)

References 12 publications

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“…The effect of water vapour on the oxidation of Ni-based chromia forming alloys is more complicated. Some authors report that a wet H 2 -containing atmosphere is more corrosive than oxygen [88], while others report slower growth of the oxide scale in wet oxygen/air compared to dry conditions [89]. This apparent discrepancy may be explained by the Cr evaporation kinetics of Ni-based alloys.…”

Section: High-temperature Oxidation Of Gas Turbine Componentsmentioning

confidence: 99%

Materials challenges in hydrogen-fuelled gas turbines

Stefan

Talic

Larring

et al. 2021

International Materials Reviews

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With the increased pressure to decarbonize the power generation sector several gas turbine manufacturers are working towards increasing the hydrogen-firing capabilities of their engines towards 100%. In this review, we discuss the potential materials challenges of gas turbines fuelled with hydrogen, provide an updated overview of the most promising alloys and coatings for this application, and highlight topics requiring further research and development. Particular focus is given to the high-temperature oxidation of gas turbine materials exposed to hydrogen and steam at elevated temperatures and to the corrosion challenges of parts fabricated by additive manufacturing. Other degradation mechanisms such as hot corrosion, the dual atmosphere effect and hydrogen diffusion in the base alloys are also discussed.

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Section: High-temperature Oxidation Of Gas Turbine Componentsmentioning

confidence: 99%

Materials challenges in hydrogen-fuelled gas turbines

Stefan

Talic

Larring

et al. 2021

International Materials Reviews

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“…super-heater and re-heater tubes in supercritical units [7] or interconnects for hydrogen production [8]. These refractory alloys are frequently stainless steels [9] or nickel-based superalloys [10]. The participation of water vapour to the oxidation of these alloys is under high interest for describing the involved mechanisms [11,12], notably concerning the accelerated oxidative evaporation of the chromia scales [13].…”

Section: Introductionmentioning

confidence: 99%

Surface degradation of three Cr-containing cobalt-based alloys exposed to pure water vapour at 900°C

Berthod

Léglise

Aranda

et al. 2020

Corrosion Engineering, Science and Technology

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Three cast cobalt-based alloys containing or not chromium carbides and tantalum carbides were exposed at 900°C to 100% water vapour for 46 or 100 h. The oxidised samples were characterised by XRD, SEM and EDS. Chromia was the main oxide formed in all cases. Spinel oxide appeared on the carbide-free alloy and NiO was also detected on the TaC-containing alloy. Chromia was the single oxide formed on the alloy containing chromium carbides. The scales were thin and the subsurfaces and the bulks were slightly affected by oxidation or thermal exposure. All alloys demonstrated remarkable oxidation resistance but oxide spallation, enhanced maybe by the low thickness of the scales, by the porosities induced by chromia volatilisation, as well as by the CrTaO 4 complex oxide formed at the interface in the case of the TaC-containing alloy, is a critical problem to solve. The Co-10Ni-30Cr-0.5C was the best of the three alloys.

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