Effect of beta-to-alpha phase transition rate on corrosion behaviour of Zircaloy

The effect of β → α phase transition rate employed at the late stages of the fabrication process of Zircaloy-2 cladding tubes on the in-reactor corrosion behaviour is investigated. A cladding tube manufactured with a slower quenching exhibits a superior uniform corrosion resistance in boiling water...

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Bibliographic Details
Published in:Corrosion science 2006-05, Vol.48 (5), p.1154-1181
Main Authors: Massih, A.R., Dahlbäck, M., Limbäck, M., Andersson, T., Lehtinen, B.
Format: Article
Language:English
Subjects:
Applied sciences
Boiling water reactors
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Quenching rate
Second phase particles
Widmanstätten structure
Zr alloys
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Summary:The effect of β → α phase transition rate employed at the late stages of the fabrication process of Zircaloy-2 cladding tubes on the in-reactor corrosion behaviour is investigated. A cladding tube manufactured with a slower quenching exhibits a superior uniform corrosion resistance in boiling water reactors than the tube manufactured with a faster quenching. Scanning and transmission electron microscopy observations show that the slow β quench material has larger second phase particles and smaller particle number densities than the fast β quench material. It is argued that the larger SPPs with the lower number density survive the neutron irradiation field longer than the smaller ones. We have related the effective β quenching rate to the mean lamella grain size width, formed upon β quenching.
ISSN:0010-938X
1879-0496
1879-0496
DOI:10.1016/j.corsci.2005.05.010