Paper Titles
Corrosion Inhibition of Zinc in KOH Solutions
p.233
Study of the Hydride Morphology in the CANDU Reactor Pressure Tube Modified by Heat Treatment
p.237
Researches Regarding the Structural and Mechanical Characteristics of the C-Mn Steel within the Specific Thermal Circuits
p.241
Protective Alumina Coatings by Low Temperature Metalorganic Chemical Vapour Deposition
p.245
Hydrides Effect on the SCC Initiation on Zircaloy-4 Claddings
p.249
XRD Investigation of Impact Pattern on Ball Bearing Steel Samples
p.253
Mechanical and Corrosion Behaviour of Some Devices for Ostheosinthesis
p.257
Silicon Influence on Corrosion Properties of Austenitic Stainless Steels
p.261
Structure of Composite Layers Reinforced with SiC Particles Obtained by Electrochemical Deposition
p.265

Hydrides Effect on the SCC Initiation on Zircaloy-4 Claddings

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Abstract:

The main cause of failure of CANDU-type fuel bundles during their operation is the Stress Corrosion Cracking (SCC). This mechanism appears in presence of the simultaneous action of a corrosive agent and of mechanical stress. The presence of precipitated zirconium hydride platelets can affect the propagation of the SCC cracks. For this reason, we studied the influence of content of hydrogen on the initiation and the propagation of SCC crack. To do this study, some Crings samples with different content of hydrogen (100-500ppm) were exposed in a corrosive environment containing iodine (10-4g/cm2) at 320°C. The stress state, the concentration of the corrosive environment and the temperature were maintained constant. For comparison, in the same conditions some as-received samples were exposed. To relieve the morphology of the precipitates of the zirconium hydride the samples were been investigated using metallographic method, before and after thermal treatments. While before the experiment a circumferential orientation of the hydrides precipitates was observed, after the thermal treatments a reorientation of hydrides in a radial direction was been remarked. Investigation by SEM method revealed the propagation modes of cracks in the case of the as-received samples and it was put in evidence the existence of the microcracks on the inner surface of tested samples.

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Periodical:

Advanced Materials Research (Volume 23)

Pages:

249-252

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.23.249

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Online since:

October 2007

Authors:

Alice Dinu, M. Radulescu, D. Ionescu, Silviu Florea

Keywords:

Stress Corrosion Cracking (SCC), Zircaloy Claddings, Zirconium Hydride

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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