Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Circumferential Creep Behaviors of Zr-Nb-O and Zr-Nb-Sn-Fe Alloy Cladding Tubes Manufactured by Pilgering

Pilgering 법에 의해 제조된 Zr-Nb-O 및 Zr-Nb-Sn-Fe 합금 피복관의 원주방향 Creep 거동

  • 이상용 (충북대학교 재료공학과) ;
  • 고산 (충남대학교 나노소재공학과) ;
  • 박용권 (충북대학교 재료공학과) ;
  • 김규태 (한전원자력연료(주)) ;
  • 최재하 (충북대학교 재료공학과) ;
  • 홍순익 (충남대학교 나노소재공학과)
  • Published : 2008.08.01
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Abstract

In this study, the circumferential creep behaviors ofpilgered advanced Zirconium alloy tubes such as Zr-Nb-O and Zr-Nb-Sn-Fe were investigated in the temperature range of $400\sim500^{\circ}C$ and in the stress range of 80$\sim$150MPa. The test results indicate that the stress exponent for the steady-state creep rate of the Zr-Nb-Sn-Fe alloy decreases with the increase of stress(from 6$\sim$7 to 4), while that of the Zr-Nb-O alloy is nearly independent of stress(5$\sim$6). The activation energy of creep deformation is found to be nearly the same as the activation energy for Zr self diffusion. This indicates that the creep deformation may be controlled by dislocation climb mechanism in Zr-Nb-O. On the other hand, the transition of stress exponent(from 6-7 to 4) in Zr-Nb Sn-Fe strongly suggests the transition of the rate controlling mechanism at high stresses. The lower stress exponent at high stresses in Zr-Nb-Sn-Fe can be explained by the dynamic deformation aging effect caused by interaction of dislocations with Sn substitutional atoms.

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