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Corrosion Fatigue Crack Initiation in Zr-2.5Nb

  • H. M. Nordin
  • A. J. Phillion
  • T. M. Karlsen
  • S. Persaud
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

ABSTRACT

In-service inspections of Zr-2.5Nb pressure tubes may reveal blunt flaws such as fretting wear or crevice corrosion marks. These flaws pose no immediate threat to the integrity of the pressure tube but may be potential fatigue crack initiation sites. An understanding of the effect of the coolant environment, specifically on fatigue crack initiation, is important in this context. Tests were conducted on notched transverse tensile specimens at 275 and 300 °C with a load rise time between 50 and 3600 s. Current tests investigated the effects of applied loading frequency and hydrogen on fatigue crack initiation. Results have indicated that long rise time and a water environment reduce the time to fatigue crack initiation in non-hydrided and pre-hydrided specimens as compared to tests conducted in air. If enough hydrogen is able to diffuse to the notch during the test, it may also be possible to reach conditions where there is an interaction between corrosion, fatigue and hydride cracking.

Keywords

Corrosion Fatigue Zr-2.5nb Hydrogen Crack initiation DCPD 

Notes

Acknowledgements

The authors acknowledge: J. Liverud, P.A. Wiig, C. Hartmann, K.L. Moum, V. Andersson, P-M. Harlem, V. Staal, I. Thoresen, and F.H. Lilleborgen from IFE for test setup, autoclave facility operation and SEM analysis. M. Seguin, A. Briton and R. MacLeod from CNL for performing the metallography and HVEMS analysis.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • H. M. Nordin
    • 1
  • A. J. Phillion
    • 1
  • T. M. Karlsen
    • 2
  • S. Persaud
    • 1
  1. 1.Canadian Nuclear Laboratories, Chalk River LaboratoriesChalk RiverCanada
  2. 2.Institute for Energy TechnologyOECD Halden Reactor ProjectHaldenNorway

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