Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Microstructure and Alloying Element on the ISCC Characteristics of Zr Cladding

Zr 피복관의 ISCC 특성에 미치는 미세조직 및 첨가원소의 영향

  • 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)
  • 박상윤 (지르코늄피복관개발팀, 한국원자력연구소) ;
  • 최병권 (지르코늄피복관개발팀, 한국원자력연구소) ;
  • 이명호 (지르코늄피복관개발팀, 한국원자력연구소) ;
  • 김준환 (지르코늄피복관개발팀, 한국원자력연구소) ;
  • 정용환 (지르코늄피복관개발팀, 한국원자력연구소)
  • Received : 2005.04.18
  • Accepted : 2005.05.17
  • Published : 2005.05.30
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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

Acknowledgement

Supported by : 과학기술부

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