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Title: Measurement and modeling of strain fields in zirconium hydrides precipitated at a stress concentration

Abstract

Hydrogen adsorption into zirconium, as a result of corrosion in aqueous environments, leads to the precipitation of a secondary brittle hydride phase. These hydrides tend to first form at stress concentrations such as fretting flaws or cracks in engineering components, potentially degrading the structural integrity of the component. One mechanism for component failure is a slow crack growth mechanism known as Delayed Hydride Cracking (DHC), where hydride fracture occurs followed by crack arrest in the ductile zirconium matrix. The current work employs both an experimental and a modeling approach to better characterize the effects and behavior of hydride precipitation at such stress concentrations. Strains around stress concentrations containing hydrides were mapped using High Energy X-ray Diffraction (HEXRD). These studies highlighted important differences in the behavior of the hydride phase and the surrounding zirconium matrix, as well as the strain associated with the precipitation of the hydride. A finite element model was also developed and compared to the X-ray strain mapping results. This model provided greater insight into details that could not be obtained directly from the experimental approaches, as well as providing a framework for future modeling to predict the effects of hydride precipitation under varied conditions.

Authors:
; ;  [1]
  1. (Queens)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1048967
Resource Type:
Journal Article
Journal Name:
J. Nucl. Mater.
Additional Journal Information:
Journal Volume: 430; Journal Issue: (1-3) ; 11, 2012; Journal ID: ISSN 0022-3115
Country of Publication:
United States
Language:
ENGLISH
Subject:
08 HYDROGEN; ADSORPTION; CORROSION; CRACK PROPAGATION; DEFECTS; FRACTURES; HYDRIDES; HYDROGEN; PRECIPITATION; SIMULATION; STRAINS; X-RAY DIFFRACTION; ZIRCONIUM; ZIRCONIUM HYDRIDES

Citation Formats

Allen, Gregory B., Kerr, Matthew, and Daymond, Mark R. Measurement and modeling of strain fields in zirconium hydrides precipitated at a stress concentration. United States: N. p., 2012. Web. doi:10.1016/j.jnucmat.2012.06.037.
Allen, Gregory B., Kerr, Matthew, & Daymond, Mark R. Measurement and modeling of strain fields in zirconium hydrides precipitated at a stress concentration. United States. doi:10.1016/j.jnucmat.2012.06.037.
Allen, Gregory B., Kerr, Matthew, and Daymond, Mark R. Tue . "Measurement and modeling of strain fields in zirconium hydrides precipitated at a stress concentration". United States. doi:10.1016/j.jnucmat.2012.06.037.
@article{osti_1048967,
title = {Measurement and modeling of strain fields in zirconium hydrides precipitated at a stress concentration},
author = {Allen, Gregory B. and Kerr, Matthew and Daymond, Mark R.},
abstractNote = {Hydrogen adsorption into zirconium, as a result of corrosion in aqueous environments, leads to the precipitation of a secondary brittle hydride phase. These hydrides tend to first form at stress concentrations such as fretting flaws or cracks in engineering components, potentially degrading the structural integrity of the component. One mechanism for component failure is a slow crack growth mechanism known as Delayed Hydride Cracking (DHC), where hydride fracture occurs followed by crack arrest in the ductile zirconium matrix. The current work employs both an experimental and a modeling approach to better characterize the effects and behavior of hydride precipitation at such stress concentrations. Strains around stress concentrations containing hydrides were mapped using High Energy X-ray Diffraction (HEXRD). These studies highlighted important differences in the behavior of the hydride phase and the surrounding zirconium matrix, as well as the strain associated with the precipitation of the hydride. A finite element model was also developed and compared to the X-ray strain mapping results. This model provided greater insight into details that could not be obtained directly from the experimental approaches, as well as providing a framework for future modeling to predict the effects of hydride precipitation under varied conditions.},
doi = {10.1016/j.jnucmat.2012.06.037},
journal = {J. Nucl. Mater.},
issn = {0022-3115},
number = (1-3) ; 11, 2012,
volume = 430,
place = {United States},
year = {2012},
month = {10}
}