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Near threshold delayed hydride crack growth in zirconium alloys

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Abstract

Delayed hydride cracking (DHC) in zirconium alloys arises as a consequence of the diffusion of hydrogen atoms to a crack tip, precipitation of hydride platelets and then the fracture of a hydrided region that has formed ahead of the crack tip. This process repeats itself and, consequently, a crack grows in a series of steps. There is a threshold value,K IH, of the crack tip stress intensity below which DHC crack growth is unable to proceed. The present paper provides a physical picture of the near threshold situation, accounting systematically for the manner in which hydrided material fractures, and consequently obtains an expression forK IH in terms of the hydrided material's flow and fracture characteristics.

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Authors and Affiliations

  1. UMIST Materials Science Centre, Manchester University, Grosvenor Street, M1 7HS, Manchester, UK

    E. Smith

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  1. E. Smith
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Smith, E. Near threshold delayed hydride crack growth in zirconium alloys. J Mater Sci 30, 5910–5914 (1995). https://doi.org/10.1007/BF01151504

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  • DOI: https://doi.org/10.1007/BF01151504

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