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Effect of direction of approach of test temperature on fracture toughness of Zr-2.5Nb pressure tube material

Singh, R. N.; Bind, A. K.; Khandelwal, H. K.; Rath, B. N.; Sunil, S.; Ståhle, Per LU and Chakravartty, J. K. (2015) In Materials Science & Engineering: A 621. p.190-197
Abstract
Previous work by one of the authors reported the stress-field for a fully-constrained hydride embedded in matrix computed using finite element method to develop an understanding of the temperature dependence of susceptibility of Zr-alloys to hydride embrittlement. It was observed that the nature and magnitude of stress field in the matrix and hydride depended on whether the hydride is expanding (experienced while cooling from a peak temperature) or contracting (experienced while heating to the test temperature). On the basis of the observed dependence of the nature and magnitude of stress components in the matrix and hydride, it was suggested that the fracture toughness of hydrided Zr-alloys may depend on the direction of approach of the... (More)
Previous work by one of the authors reported the stress-field for a fully-constrained hydride embedded in matrix computed using finite element method to develop an understanding of the temperature dependence of susceptibility of Zr-alloys to hydride embrittlement. It was observed that the nature and magnitude of stress field in the matrix and hydride depended on whether the hydride is expanding (experienced while cooling from a peak temperature) or contracting (experienced while heating to the test temperature). On the basis of the observed dependence of the nature and magnitude of stress components in the matrix and hydride, it was suggested that the fracture toughness of hydrided Zr-alloys may depend on the direction of approach of the test temperature. In order to verify this, fracture tests were carried out using samples machined from hydrogen charged Zr-2.5Nb alloy pressure tube material as per ASTM standard E1820-11 in which the test temperature was attained by either heating to the test temperature or cooling from a peak temperature. The direction of approach of the test temperature did not affect the fracture toughness in the lower and upper shelf temperature regime, it indeed had an effect in the transition regime. The computed stress field could provide explanation for the observed axial splits on the fracture surfaces for both the heating and cooling cases. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Zr-2.5Nb alloy, Pressure tubes, Fracture toughness, Hydride, embrittlement, Direction of approach of test temperature
in
Materials Science & Engineering: A
volume
621
pages
190 - 197
publisher
Elsevier
external identifiers
  • wos:000347590600024
  • scopus:84910116974
ISSN
1873-4936
DOI
10.1016/j.msea.2014.10.052
language
English
LU publication?
yes
id
fca6c6dd-f13e-4fd2-9633-8eb259e1a468 (old id 5069886)
date added to LUP
2015-02-25 14:28:45
date last changed
2017-10-08 03:18:32
@article{fca6c6dd-f13e-4fd2-9633-8eb259e1a468,
  abstract     = {Previous work by one of the authors reported the stress-field for a fully-constrained hydride embedded in matrix computed using finite element method to develop an understanding of the temperature dependence of susceptibility of Zr-alloys to hydride embrittlement. It was observed that the nature and magnitude of stress field in the matrix and hydride depended on whether the hydride is expanding (experienced while cooling from a peak temperature) or contracting (experienced while heating to the test temperature). On the basis of the observed dependence of the nature and magnitude of stress components in the matrix and hydride, it was suggested that the fracture toughness of hydrided Zr-alloys may depend on the direction of approach of the test temperature. In order to verify this, fracture tests were carried out using samples machined from hydrogen charged Zr-2.5Nb alloy pressure tube material as per ASTM standard E1820-11 in which the test temperature was attained by either heating to the test temperature or cooling from a peak temperature. The direction of approach of the test temperature did not affect the fracture toughness in the lower and upper shelf temperature regime, it indeed had an effect in the transition regime. The computed stress field could provide explanation for the observed axial splits on the fracture surfaces for both the heating and cooling cases. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Singh, R. N. and Bind, A. K. and Khandelwal, H. K. and Rath, B. N. and Sunil, S. and Ståhle, Per and Chakravartty, J. K.},
  issn         = {1873-4936},
  keyword      = {Zr-2.5Nb alloy,Pressure tubes,Fracture toughness,Hydride,embrittlement,Direction of approach of test temperature},
  language     = {eng},
  pages        = {190--197},
  publisher    = {Elsevier},
  series       = {Materials Science & Engineering: A},
  title        = {Effect of direction of approach of test temperature on fracture toughness of Zr-2.5Nb pressure tube material},
  url          = {http://dx.doi.org/10.1016/j.msea.2014.10.052},
  volume       = {621},
  year         = {2015},
}