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Corrosion science and technology v.6 no.4, 2007년, pp.170 - 176  

Mechanism of Environmentally-Induced Stress Corrosion Cracking of Zr-Alloys

Park, Sang Yoon   (Advanced Core Materials Lab. Korea Atomic Energy Research InstituteCC0186830  ); Kim, Jun Hwan   (Advanced Core Materials Lab. Korea Atomic Energy Research InstituteCC0186830  ); Choi, Byung Kwon   (Advanced Core Materials Lab. Korea Atomic Energy Research InstituteCC0186830  ); Jeong, Yong Hwan   (Advanced Core Materials Lab. Korea Atomic Energy Research InstituteCC0186830  );
  • 초록

    Iodine-induced stress corrosion cracking (ISCC) properties and the associated ISCC process of Zircaloy-4 and an Nb-containing advanced nuclear fuel cladding were evaluated. An internal pressurization test with a pre-cracked specimen was performed with a stress-relieved (SR) or recrystallized (RX) microstructure at $350^{\circ}C$ , in an iodine environment. The results showed that the $K_{ISCC}$ of the SR and RX Zircaloy-4 claddings were 3.3 and 4.8MPa\;m^{0.5} , respectively. And the crack propagation rate of the RX Zircaloy-4 was 10 times lower than that of the SR one. The chemical effect of iodine on the crack propagation rate was very high, which was increased $10^4$ times by iodine addition. Main factor affecting on the micro-crack nucleation was a pitting formation and its agglomeration along the grain boundary. However, this pitting formation on the grain-boundary was suppressed in the case of an Nb addition, which resulted in an increase of the ISCC resistance when compared to Zircaloy-4. Crack initiation and propagation mechanisms of fuel claddings were proposed by a grain boundary pitting model and a pitting assisted slip cleavage model and they showed reasonable results.


  • 주제어

    Iodine-induced stress corrosion cracking (ISCC) .   Zircaloy-4 .   Crack initiation .   propagation .   Threshold stress-intensity factor ( $K_{ISCC}$) .   grain boundary pitting.  

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