Temperature-dependent axial mechanical properties of Zircaloy-4 with various hydrogen amounts and hydride orientations

방신효; 김호아; 노재수; 김동욱; 금경환; 이유호

doi:https://doi.org/10.1016/j.net.2021.11.007

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자료유형: 학술저널

저자정보: 방신효 (서울대학교) 김호아 (한양대학교) 노재수 ((주)액트) 김동욱 (서울대학교) 금경환 (서울대학교) 이유호 (서울대학교)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제5호

발행연도: 2022.5

수록면: 1,579 - 1,587 (9page)

DOI: https://doi.org/10.1016/j.net.2021.11.007

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The effects of hydride amount (20e850 wppm), orientation (circumferential and radial), and temperature (room temperature, 100 C, 200 C) on the axial mechanical properties of Zircaloy-4 cladding werecomprehensively examined. The fraction of radial hydride fraction in the cladding was quantified usingPROPHET, an in-house radial hydride fraction analysis code. Uniaxial tensile tests (UTTs) were conductedat various temperatures to obtain the axial mechanical properties. Hydride orientation has a limitedeffect on the axial mechanical behavior of hydrided Zircaloy-4 cladding. Ultimate tensile stress (UTS) andassociated uniform elongation demonstrated limited sensitivity to hydride content under UTT. Statisticaluncertainty of UTS was found small, supporting the deterministic approach for the load-failure analysisof hydrided Zircaloy-4 cladding. These properties notably decrease with increasing temperature in thetested range. The dependence of yield strength on hydrogen content differed from temperature totemperature. The ductility-related parameters, such as total elongation, strain energy density (SED), andoffset strain decrease with increasing hydride contents. The abrupt loss of ductility in UTT was found at~700 wppm. Demonstrating a strong correlation between total elongation and offset strain, SED can beused as a comprehensive measure of ductility of hydrided zirconium allo

#Spent nuclear fuel #Zircaloy-4 cladding #Zirconium hydride #Axial mechani

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