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Threshold stress intensity factor for delayed hydride cracking in Zr-2.5%Nb pressure tube alloy

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Author

  • R. N. Singh
  • Per Ståhle
  • J. K. Chakravartty
  • A. A. Shmakov

Summary, in English

Delayed hydride cracking (DHC) velocity was determined at 203,227,250 and 283 degrees C using 17 mm width curved compact toughness specimens machined from an unirradiated Zr-2.5 wt.% Nb pressure tube spool, gaseously charged with 60 ppm of hydrogen by weight. Single CT specimen was used to determine DHC velocity at a constant temperature for a range of stress intensity factor (K-1) obtained by load drop method. For a given temperature and K-1 > 15 Mpa m(1/2), DHC velocity was found to be practically independent of K-1. For 15 > K-1 > 10 MPa m(1/2), DHC velocity decreased significantly with decrease in stress intensity factor and extrapolation of the data suggested the threshold stress intensity factor to be about 9-11 MPa m(1/2) in the aforementioned temperature range. The activation energy associated with DHC was observed to be 35.1 kJ/mol. (C) 2009 Elsevier B.V. All rights reserved.

Department/s

Publishing year

2009

Language

English

Pages

112-117

Publication/Series

Materials Science & Engineering: A

Volume

523

Issue

1-2

Document type

Journal article

Publisher

Elsevier

Topic

  • Mechanical Engineering

Keywords

  • Threshold stress intensity
  • Zr-2.5Nb alloy
  • Delayed hydride cracking
  • factor
  • Pressure tube

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-4936