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Influence of hydrogen content on impact toughness of Zr-2.5Nb pressure tube alloy

Singh, R. N.; Viswanathan, U. K.; Kumar, Sunil; Satheesh, P. M.; Anantharaman, S.; Chakravartty, J. K. and Ståhle, Per LU (2011) In Nuclear Engineering and Design 241(7). p.2425-2436
Abstract
Influence of hydrogen content on the impact toughness of Zr-2.5% Nb alloy was examined by carrying out instrumented drop weight tests in the temperature range of 25-250 degrees C using curved Charpy specimens fabricated from unirradiated pressure tubes of Indian Pressurized Heavy Water Reactor (IPHWR). Hydrogen content of the samples was between 10 and 170 ppm by weight (wppm). Sharp ductile-to-brittle-transition behaviour was demonstrated by hydrided materials. The temperature for the onset of transition increased with the increase in the hydrogen content of the specimens. The fracture surfaces of unhydrided specimen exhibited ductile fracture caused by micro void coalescence and tear ridges at lower temperatures and by fibrous fracture... (More)
Influence of hydrogen content on the impact toughness of Zr-2.5% Nb alloy was examined by carrying out instrumented drop weight tests in the temperature range of 25-250 degrees C using curved Charpy specimens fabricated from unirradiated pressure tubes of Indian Pressurized Heavy Water Reactor (IPHWR). Hydrogen content of the samples was between 10 and 170 ppm by weight (wppm). Sharp ductile-to-brittle-transition behaviour was demonstrated by hydrided materials. The temperature for the onset of transition increased with the increase in the hydrogen content of the specimens. The fracture surfaces of unhydrided specimen exhibited ductile fracture caused by micro void coalescence and tear ridges at lower temperatures and by fibrous fracture at intermediate and at higher temperatures. Except for the samples tested at the upper shelf energy levels, the fracture surfaces of all hydrided samples were suggestive of hydride assisted failure. In most cases the transverse cracks observed in the fracture path matched well with the hydride precipitate distribution and orientation. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nuclear Engineering and Design
volume
241
issue
7
pages
2425 - 2436
publisher
Elsevier
external identifiers
  • wos:000293493400007
  • scopus:79958164901
ISSN
1872-759X
DOI
10.1016/j.nucengdes.2011.04.024
language
English
LU publication?
yes
id
2c8a8168-ac73-454b-a973-439c21317c9c (old id 2162819)
date added to LUP
2011-09-20 12:20:59
date last changed
2017-11-19 03:00:10
@article{2c8a8168-ac73-454b-a973-439c21317c9c,
  abstract     = {Influence of hydrogen content on the impact toughness of Zr-2.5% Nb alloy was examined by carrying out instrumented drop weight tests in the temperature range of 25-250 degrees C using curved Charpy specimens fabricated from unirradiated pressure tubes of Indian Pressurized Heavy Water Reactor (IPHWR). Hydrogen content of the samples was between 10 and 170 ppm by weight (wppm). Sharp ductile-to-brittle-transition behaviour was demonstrated by hydrided materials. The temperature for the onset of transition increased with the increase in the hydrogen content of the specimens. The fracture surfaces of unhydrided specimen exhibited ductile fracture caused by micro void coalescence and tear ridges at lower temperatures and by fibrous fracture at intermediate and at higher temperatures. Except for the samples tested at the upper shelf energy levels, the fracture surfaces of all hydrided samples were suggestive of hydride assisted failure. In most cases the transverse cracks observed in the fracture path matched well with the hydride precipitate distribution and orientation. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Singh, R. N. and Viswanathan, U. K. and Kumar, Sunil and Satheesh, P. M. and Anantharaman, S. and Chakravartty, J. K. and Ståhle, Per},
  issn         = {1872-759X},
  language     = {eng},
  number       = {7},
  pages        = {2425--2436},
  publisher    = {Elsevier},
  series       = {Nuclear Engineering and Design},
  title        = {Influence of hydrogen content on impact toughness of Zr-2.5Nb pressure tube alloy},
  url          = {http://dx.doi.org/10.1016/j.nucengdes.2011.04.024},
  volume       = {241},
  year         = {2011},
}