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Influence of stress field of expanding and contracting plate shaped precipitate on hydride embrittlement of Zr-alloys
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2013 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 579, p. 157-163Article in journal (Refereed)
Abstract [en]

The stress fields of expanding (precipitation) and contracting (dissolution) hydride plates were computed by finite element method using Zr–H solid solution and hydride properties at 25, 200 and 400 °C for fully and semi-constrained hydride plates. For the first time simultaneous hydride expansion and matrix contraction and vice-versa have been considered in a simulation of hydride precipitation and dissolution, respectively. It was observed that a fully constrained expanding hydride plate exerts a tensile stress field in the matrix close to the edge of the hydride plate while a partially contracting hydride plate exerts a tensile stress field in the hydride plate as well as a large compressive stress in the surrounding matrix close to the edge of the hydride plate. It is suggested that a compressive stress component in the matrix acting normal to a partially shrinking hydride plate could possibly explain an enhanced resistance to hydride embrittlement of Zr-alloy at elevated temperature.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 579, p. 157-163
Keywords [en]
Zr-alloy, Hydride embrittlement, Fracture toughness, Stress-field, Fully constrained
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mau:diva-2676DOI: 10.1016/j.msea.2013.04.117ISI: 000321681900021Scopus ID: 2-s2.0-84878726590Local ID: 17606OAI: oai:DiVA.org:mau-2676DiVA, id: diva2:1399439
Available from: 2020-02-27 Created: 2020-02-27 Last updated: 2024-02-05Bibliographically approved

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Ståhle, Per

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