Influence of stress field of expanding and contracting plate shaped precipitate on hydride embrittlement of Zr-alloys
Författare
Summary, in English
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 degrees 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. (C) 2013 Elsevier B.V. All rights reserved.
Avdelning/ar
Publiceringsår
2013
Språk
Engelska
Sidor
157-163
Publikation/Tidskrift/Serie
Materials Science & Engineering: A
Volym
579
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Mechanical Engineering
Nyckelord
- Zr-alloy
- Hydride embrittlement
- Fracture toughness
- Stress-field
- Fully
- constrained
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1873-4936