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Neutron Imaging Investigations of the Hydrogen Related Degradation of the Mechanical Properties of Zircaloy-4 Cladding Tubes

Published online by Cambridge University Press:  14 March 2013

M. Grosse ,
S. Valance ,
J. Stuckert ,
M. Steinbrueck ,
M. Walter ,
A. Kaestner ,
S. Hartmann  and
J. Santisteban
M. Grosse
Affiliation:
Karlsruhe Institute of Technology – Institute for Applied Materials, Karlsruhe, Germany
S. Valance
Affiliation:
Paul Scherrer Institut, Villigen, Switzerland
J. Stuckert
Affiliation:
Karlsruhe Institute of Technology – Institute for Applied Materials, Karlsruhe, Germany
M. Steinbrueck
Affiliation:
Karlsruhe Institute of Technology – Institute for Applied Materials, Karlsruhe, Germany
M. Walter
Affiliation:
Karlsruhe Institute of Technology – Institute for Applied Materials, Karlsruhe, Germany
A. Kaestner
Affiliation:
Paul Scherrer Institut, Villigen, Switzerland
S. Hartmann
Affiliation:
Paul Scherrer Institut, Villigen, Switzerland
J. Santisteban
Affiliation:
Comision Nacional de Energia Atomica, Bariloche, Argentina
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Abstract

The hydrogen uptake and redistribution in Zircaloy-4 specimens applied to loss of coolant accident (LOCA) simulation experiments and in mechanical pre-loaded samples were investigated by means of ex-situ and in-situ neutron imaging. The results of these investigations were compared with results from mechanical tests. Hydrogen absorption may have a strong influence on the mechanical properties of zirconium alloys. A local enrichment of the absorbed hydrogen may result in brittle fracture at these positions in the tensile test. On the other hand, stress fields in the material affect the hydrogen uptake as well as its distribution in the material. In-situ investigations confirmed the existence of an initial oxide layer formed at room temperature by contact with air. This oxide layer suppresses the hydrogen uptake until dissolution in the zirconium matrix.

Keywords

neutron scatteringZrhydrogenation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1528: Symposium VV – Advanced Materials Exploration with Neutrons and Synchrotron X-Rays , 2013 , mrsf12-1528-vv07-05
Copyright
Copyright © Materials Research Society 2013

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References

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