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High resolution electron microscopy study on oxide films formed on nickel-base Alloys X-750, 182 and 82 in simulated high flow velocity BWR water conditions
RISE, Swerea, Swerea KIMAB.
2011 (English)In: 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011, John Wiley and Sons Inc. , 2011, Vol. 1, 357-369 p.Conference paper, Published paper (Refereed)
Abstract [en]

This work contributes to characterization of the oxide films formed on nickel-base alloys (Alloy X-750, Alloy 82 and Alloy 182) under simulated BWR water environments at ∼10 or 18 m/s with or without iron injection. HR SEM/TEM and FIB techniques were applied. The oxide thicknesses on different alloys were substantially different, ranging from 50 nm to 8 μm. For Alloy X-750 and Alloy 182 exposed without iron injection, similar oxide phase compositions consisting of sub-micron Fe2O3 and NiFe 2O4 grains as well as NiO were formed but with substantially different microstructures. For the corroded Alloy X-750 there was an additional dense layer of possibly Ni1.5Cr0.5O 3 in between the NiFe2O4 and NiO layers. On Alloy 82 which contained a relatively low Fe-content only a thin but dense film of Cr1.3Fe0.7O3 was seen. With iron injection the oxide films formed on Alloy 82 were similar to that on the Alloy 182 without iron injection, suggesting that iron injection may play a similar role as if the alloy had an elevated iron content. The implication of the observations for material corrosion behavior in BWRs is elaborated.

Place, publisher, year, edition, pages
John Wiley and Sons Inc. , 2011. Vol. 1, 357-369 p.
Keyword [en]
Alloy 182, Alloy 82, Alloy X-750, Alloys, BWR, Corrosion, FIB, Inconel, Microstructure, Nickel-base, Oxide films, TEM
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12961ISBN: 9781622761944 (print)OAI: oai:DiVA.org:ri-12961DiVA: diva2:973154
Conference
15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors 2011, Colorado Springs, CO, 7 August 2011 through 11 August 2011, 93209
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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Swerea KIMAB
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CiteExportLink to record
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  • apa
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