Influence of hydride microstructure on through-thickness crack growth in zircaloy-4 sheet

P. A. Raynaud, M. J. Meholic, D. A. Koss, Arthur Thompson Motta, K. S. Chan

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

1 Scopus citations

Abstract

The fracture toughness of cold-worked and stress-relieved Zircaloy-4 sheet subject to through-thickness crack growth within a "sunburst" hydride microstructure was determined at 25°C. The results were obtained utilizing a novel testing procedure in which a narrow linear strip of hydride blister was fractured at small loads under bending to create a well-defined sharp precrack that arrested at the blister-substrate interface. The hydriding procedure also forms "sunburst" hydrides emanating from the blister that were aligned both in the plane of the crack and in the crack growth direction. Subsequent tensile loading caused crack growth initiation into the field of "sunburst" hydrides. Specimen failure occurred under near-linear elastic behavior, and the fracture toughness for crack growth initiation into sunburst hydrides was in the range KQ ≈ 10-15 MPa√m. These results, when combined with those of a previous study [1], indicate that the through-thickness crack growth initiation toughness at 25°C is very sensitive to the hydride microstructure.

Original languageEnglish (US)
Title of host publicationProceedings - CIS Workshops 2007, 2007 International Conference on Computational Intelligence and Security Workshops, CISW 2007
Pages1514-1527
Number of pages14
StatePublished - Dec 1 2007
Event13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007 - Whistler, BC, Canada
Duration: Apr 19 2007Apr 23 2007

Publication series

NameCanadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
Volume3

Other

Other13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
CountryCanada
CityWhistler, BC
Period4/19/074/23/07

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Safety, Risk, Reliability and Quality
  • Materials Science(all)

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    Raynaud, P. A., Meholic, M. J., Koss, D. A., Motta, A. T., & Chan, K. S. (2007). Influence of hydride microstructure on through-thickness crack growth in zircaloy-4 sheet. In Proceedings - CIS Workshops 2007, 2007 International Conference on Computational Intelligence and Security Workshops, CISW 2007 (pp. 1514-1527). (Canadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007; Vol. 3).