Strain rate dependence of iodine-induced stress corrosion cracking of Zircaloy-4 under internal pressurization tests

Pressurization tests were run on unirradiated Zircaloy-4 tubing in the pressure range of 400-550 MPa and temperature, 330-400 deg C. The effects of the mechanical factor on the susceptibility of Zircaloy to iodine-induced stress corrosion cracking (ISCC) were studied in terms of both time-to-failure...

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Bibliographic Details
Published in:Journal of materials science 1990-07, Vol.25 (7), p.3167-3172
Main Authors: Ryu, Woo Seog, Lee, Jai Young, Kang, Young Hwan, Suk, Ho Chun
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Exact sciences and technology
Metals. Metallurgy
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Summary:Pressurization tests were run on unirradiated Zircaloy-4 tubing in the pressure range of 400-550 MPa and temperature, 330-400 deg C. The effects of the mechanical factor on the susceptibility of Zircaloy to iodine-induced stress corrosion cracking (ISCC) were studied in terms of both time-to-failure and failure strain. The time-to-failure was related to the nth power of stress, and the failure strain was a parabolic function of the strain rate in the limited range of 10 exp --7 -10 exp --4 exp --1 . The ISCC susceptibiltiy was determined by the strain rate rather than the stress, and decreased with increasing test temperature. The results suggest that the film rupture step should be involved in the Zircaloy ISCC and that gas adsorption process is an important step in the overall ISCC. Graphs, Photomicrographs. 25 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00587669