Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Investigation of Oxidation Behavior of Alloy 617 under Air/Helium Environments at 950℃

니켈기 합금 Alloy 617의 950℃ 대기/헬륨 분위기에서 산화거동 고찰

  • Jung, Sujin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Lee, Gyeong-Geun (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kim, Dong-Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute (KAERI))
  • 정수진 (한국원자력연구원 원자력재료연구부) ;
  • 이경근 (한국원자력연구원 원자력재료연구부) ;
  • 김동진 (한국원자력연구원 원자력재료연구부)
  • Received : 2018.08.20
  • Accepted : 2018.10.02
  • Published : 2018.10.31
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Abstract

Alloy 617 is a candidate Ni-based superalloy for intermediate heat exchanger (IHX) of a high-temperature gas reactor (VHTR), because of its good creep strength and corrosion resistance at high temperature. Small amount of impurities such as $H_2O$, $H_2$, CO and $CH_4$ are introduced inevitably in helium, as a coolant during operation of a VHTR. Reactions of material and impurities are accelerated with increase of temperature to $950^{\circ}C$ of operating temperature of a VHTR, leading to material corrosion aggravation. In this circumstance, high-temperature corrosion tests were performed at $950^{\circ}C$ in air and impure helium environments, up to 250 hours in this study. Oxidation rate of $950^{\circ}C$ in an air environment was higher than that of impure helium, explained by difference in outer oxide morphology and microstructure as a function of oxygen partial pressure. An equiaxed Cr-rich surface oxide layer was formed in an air environment, and a columnar Cr-rich oxide was formed in an impure helium environment.

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