The influence of a hydrided layer on the fracture of Zircaloy-4 cladding tubes

Robert S. Daum, Dowlas W. Bates, Donald A. Koss, Arthur Thompson Motta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Scopus citations

Abstract

During operation of nuclear power reactors, irradiated Zircaloy™-4 cladding tubes contain circumferentially oriented hydrides concentrated in a layer near the outer surface of the cladding. This study has investigated the effect of such a hydride layer or "rim" located near the outer surface of the cladding tube on the failure of unirradiated Zircaloy-4 cladding tubes. Utilizing plane-strain ring-stretch tests with the maximum principal stress along the circumferential or hoop direction, we examined the influence of a hydride rim on the failure of Zircaloy-4 cladding at both room temperature and 300°C. Fracture is found to be sensitive to hydride-rim thickness such that cladding tubes with a hydride-rim thickness >140 μm (≈700 wtppm total hydrogen) exhibit brittle behavior, while cladding tubes with a rim thickness <90 μm (≈600 wtppm) remain ductile. The mechanism of failure is identified as strain-induced sequence of microcrack initiation within the hydride rim, linkage of microcracks to form a long (surface) crack, and subsequent failure of the cladding wall due to either a shear instability or ductile crack growth.

Original languageEnglish (US)
Title of host publicationHydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions
EditorsN.R. Moody, A.W. Thompson, R.E. Ricker, G.S. Was, R.H. Jones
Pages249-258
Number of pages10
StatePublished - Dec 1 2003
EventInternational Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Moran, WY, United States
Duration: Sep 22 2002Sep 26 2002

Publication series

NameHydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions

Other

OtherInternational Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions
CountryUnited States
CityMoran, WY
Period9/22/029/26/02

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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