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Effect of Microstructure and Alloying Element on the ISCC Characteristics of Zr Cladding  

Park, Sang Yoon (Zirconium Cladding Development Team, Korea Atomic Energy Research Institute)
Choi, Byoung Kwon (Zirconium Cladding Development Team, Korea Atomic Energy Research Institute)
Lee, Myung Ho (Zirconium Cladding Development Team, Korea Atomic Energy Research Institute)
Kim, Jun Hwan (Zirconium Cladding Development Team, Korea Atomic Energy Research Institute)
Jeong, Yong Hwan (Zirconium Cladding Development Team, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society for Heat Treatment / v.18, no.3, 2005 , pp. 164-171 More about this Journal
Abstract
Iodine-Induced Stress Corrosion Cracking (ISCC) properties of Zircaloy-4 and HANA4 developed in KAERI for the high burn-up nuclear fuel cladding were evaluated. To confirm the effect of final heat treatment on ISCC resistance of Zr-alloy, stress relieved and recrystallized specimens were prepared and tested. With the pre-cracked specimen at internal surface, ISCC crack propagation rates and threshold stress intensity factor ($K_{ISCC}$) based on the fracture mechanics were measured by internal pressurization test at $350^{\circ}C$ in iodine environment. $K_{ISCC}$ of Zircaloy-4 and HANA4 cladding were $3.3MPa{\cdot}m^{1/2}$ and $4.4MPa{\cdot}m^{1/2}$, respectively. Pitting corrosion at the crack surface was observed and it seemed that TG crack propagation was derived from the pitting.
Keywords
Zr-cladding; HANA4 alloy; ISCC; $K_{ISCC}$; Crack propagation rate;
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