발간논문

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Vol.24, No.4, 498 ~ 503, 1986
Title
Effect of Stress on the oxide Layer Thickness and Post - Oxidation creep Strain of Zircaloy - 4
임상호Sang Ho Lim, 윤용구Young Ku Yoon
Abstract
Effects of compressive stress generated in the oxide layer and its subsequent relief on oxidation rate and post-oxidation creep characteristics of Zircaloy-4 were investigated by oxidation studies in steam with and without applied tensile stress and by creep testing at 700℃ in high purity argon. The thickness of oxide layer increased with the magnitude of tensile stress applied during oxidation at 650℃ in steam whereas similar phenomenon was not observed during oxidation at 800℃. Zircaloy-4 specimens oxidized at 600℃ in steam without applied stress exhibited higher creep strain than that shown by unoxidized specimens when creep-tested in argon. Zircaloy-4 specimens oxidized at 600℃ steam under the applied stress of 8.53MPa and oxidized at 800℃ under the applied stress of 0 and 8.53MPa exhibited lower strain than that shown by unoxidized specimen. The above experimental results were accounted for on the basis of interactions among applied stress during oxidiation, compressive stress generated in the oxide layer and elasticity of Zircaloy-4 matrix.
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