Abstract
Oxide-dispersion strengthened steels are promising materials for extreme service conditions including nuclear reactors core. In service conditions, nuclear fuel claddings are exposed to the fission gas pressure at temperatures about 700 °C. This paper presents novel results on ODS creep properties from a round robin of inner gas pressure creep test. A gas pressure creep test, simulating fission gas loading, was designed and achieved by four different European teams. Lifetime and specific behavior of ODS steel tube are prospected. Based on a mechanical clamping achieving gas tightness, short length tubes samples are tested by different laboratories. In situ laser measurements exhibit the radial expansion of ODS steel tubes before failure. Post-mortem, geometrical characterizations are performed to determine hoop strains at failure. A consistent creep lifetime is observed by all the teams even with slightly different testing apparatus and clamping systems. Under inner gas pressure, ODS steels exhibit a typical failure by leakage associated to a very small radial expansion. This behavior results from a brutal failure (burst) without evidence of tertiary creep stage. This failure mode of ODS cladding in creep conditions is consistently observed on all samples of the study. Inner gas pressure creep tests were compared, for the first time, by four European laboratories on ODS steel tube. This technique, simulating the fission gas pressure loading, is applied on small and mechanically clamped samples. This technique shows a remarkable consistency between the different laboratories results and demonstrates to be efficient for ODS steel cladding tube qualification. The results show a correlation between the creep properties and the microstructure.
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Acknowledgments
This work has been supported by the MatISSE European H2020 program. We kindly thank Elodie ROUESNE (CEA) for SEM-EBSD characterization of materials and Sébastien VINCENT for his contribution to creep matrix definition. The SAFIR2018 programme is acknowledged for development of the Crebello biaxial testing system at VTT. At EDF, Emmanuelle SCHOENER (EDF) for creep test performance, Martine BLAT (EDF) for material discussions and Frédéric DELABROUILLE (EDF) for microscopic investigations are acknowledged.
Author Contributions
DS contributed to resources, writing—original draft, and investigation. UE contributed to supervision, conceptualization, resources, and summarizing results. JR contributed to methodology, investigation, and data curation. MW contributed to resources and investigations. AH contributed to investigation and methodology. LF contributed to investigation and methodology. AU was involved in investigation and writing—review and editing. NM contributed to resources, methodology, and investigations. SG contributed to concept and resources. EO contributed to investigation and data curation. MH-M contributed to investigation, data curation, and writing—original draft. YC contributed to concept and supervision.
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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study
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Annex
Tube creep matrix table for 9Cr ODS and 14Cr ODS steel
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Manuscript submitted October 6, 2020, accepted May 7, 2021.
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Sornin, D., Ehrnstén, U., Mozzani, N. et al. Creep Properties of 9Cr and 14Cr ODS Tubes Tested by Inner Gas Pressure. Metall Mater Trans A 52, 3541–3552 (2021). https://doi.org/10.1007/s11661-021-06327-0
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DOI: https://doi.org/10.1007/s11661-021-06327-0