Influence of stress field of expanding and contracting plate shaped precipitate on hydride embrittlement of Zr-alloys

R. N. Singh, H. K. Khandelwal, A. K. Bind, S. Sunil, Per Ståhle

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)157-163
Number of pages6
JournalMaterials Science & Engineering: A
Volume579
DOIs
Publication statusPublished - 2013

Subject classification (UKÄ)

  • Mechanical Engineering

Free keywords

  • Zr-alloy
  • Hydride embrittlement
  • Fracture toughness
  • Stress-field
  • Fully
  • constrained

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