### Crack initiation and propagation behavior of zirconium cladding under an environment of iodine-induced stress corrosionCrack initiation and propagation behavior of zirconium cladding under an environment of iodine-induced stress corrosion

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 Author Park, Sang Yoon ♦ Kim, Jun Hwan ♦ Choi, Byung Kwon ♦ Jeong, Yong Hwan Source SpringerLink Content type Text Publisher The Korean Institute of Metals and Materials File Format PDF Copyright Year ©2007 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword nuclear fuel cladding ♦ iodine-induced stress corrosion cracking ♦ crack initiation ♦ zirconium ♦ pitting nucleation ♦ K$_{ISCC}$ ♦ Metallic Materials ♦ Operating Procedures, Materials Treatment ♦ Magnetism, Magnetic Materials ♦ Engineering Thermodynamics, Heat and Mass Transfer ♦ Characterization and Evaluation of Materials ♦ Continuum Mechanics and Mechanics of Materials Abstract Tests of iodine-induced stress corrosion cracking (ISCC) were carried out to elucidate the initiation and propagation of cracks in the claddings of zirconium alloys. Zircaloy-4 cladding and Nb-contained zirconium cladding were pressurized with and without a pre-cracked state at 350°C in an iodine environment. The results show that pitting nucleation and growth play an important role in initiating ISCC. Pits preferentially grow and agglomerate around the grain boundary, where the number of pits increases with the iodine concentration and the hoop stress of the claddings. A model of grain-boundary pitting coalescence and a model of pitting-assisted slip cleavage, which were proposed to clearly elucidate the crack initiation and propagation process under ISCC, produce reasonable results. The Nb-contained zirconium cladding exhibits higher ISCC resistance than Zircaloy-4 from the standpoint of a higher threshold stress-intensity factor and a lower crack propagation rate. ISSN 15989623 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2007-01-01 Publisher Place Seoul e-ISSN 12344320 Journal Metals and Materials Volume Number 13 Issue Number 2 Page Count 9 Starting Page 155 Ending Page 163