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

Singh, R. N.; Ståhle, Per LU ; Chakravartty, J. K. and Shmakov, A. A. (2009) In Materials Science & Engineering: A 523(1-2). p.112-117
Abstract
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)... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Threshold stress intensity, Zr-2.5Nb alloy, Delayed hydride cracking, factor, Pressure tube
in
Materials Science & Engineering: A
volume
523
issue
1-2
pages
112 - 117
publisher
Elsevier
external identifiers
  • wos:000270632900017
  • scopus:68949192832
ISSN
1873-4936
DOI
10.1016/j.msea.2009.05.066
language
English
LU publication?
yes
id
7f7615ad-d0cb-4ff9-a980-ee1ea78b4ca2 (old id 1507275)
date added to LUP
2009-11-20 15:23:33
date last changed
2017-11-19 03:31:29
@article{7f7615ad-d0cb-4ff9-a980-ee1ea78b4ca2,
  abstract     = {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.},
  author       = {Singh, R. N. and Ståhle, Per and Chakravartty, J. K. and Shmakov, A. A.},
  issn         = {1873-4936},
  keyword      = {Threshold stress intensity,Zr-2.5Nb alloy,Delayed hydride cracking,factor,Pressure tube},
  language     = {eng},
  number       = {1-2},
  pages        = {112--117},
  publisher    = {Elsevier},
  series       = {Materials Science & Engineering: A},
  title        = {Threshold stress intensity factor for delayed hydride cracking in Zr-2.5%Nb pressure tube alloy},
  url          = {http://dx.doi.org/10.1016/j.msea.2009.05.066},
  volume       = {523},
  year         = {2009},
}