Corrosion Science and Technology

  • 제19권3호
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  • Pages.138-145
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  • 2020
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
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Alloy 600의 결정립계 산화에 대한 표면 변형의 영향

Effects of Surface Deformation on Intergranular Oxidation of Alloy 600

  • 하동욱 (한국원자력연구원 재료안전기술개발부) ;
  • 임연수 (한국원자력연구원 재료안전기술개발부) ;
  • 김동진 (한국원자력연구원 재료안전기술개발부)
  • Ha, Dong Woog (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Lim, Yun Soo (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Kim, Dong Jin (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute)
  • 투고 : 2020.03.30
  • 심사 : 2020.05.25
  • 발행 : 2020.06.30
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초록

Immersion tests of Alloy 600 were conducted in simulated primary water environments of a pressurized water reactor at 325 ℃ for 10, 100, and 1000 h to obtain insight into effects of surface deformation on internal and intergranular (IG) oxidation behavior through precise characterization using various microscopic equipment. Oxidized samples after immersion tests were covered with polyhedral and filamentous oxides. It was found that oxides were abundant in mechanically ground (MG) samples the most. The number density of surface oxides increased with time irrespective of the method of surface finish. IG oxidation occurred in mechanically polished (MP) and chemically polished (CP) samples with thin internal oxidation layers. However, IG oxidation was suppressed with relatively thick internal oxidation layers in MG samples compared to MP and CP samples, suggesting that MG treatment could increase resistance to primary water stress corrosion cracking (PWSCC) from the standpoint of IG oxidation. As a result, appropriate surface treatment for Alloy 600 could prevent oxygen diffusion into grain boundaries, inhibit IG oxidation, and finally induce its high PWSCC resistance.

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