Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Evaluation of Tensile Property of Austenitic Alloys Exposed to High-Temperature S-CO2 Environment

고온 S-CO2 환경에 노출된 오스테나이트계 합금의 인장특성 평가

  • Kim, Hyunmyung (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Ho Jung (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Jang, Changheui (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
  • 김현명 (한국과학기술원 원자력 및 양자공학과) ;
  • 이호중 (한국과학기술원 원자력 및 양자공학과) ;
  • 장창희 (한국과학기술원 원자력 및 양자공학과)
  • Received : 2014.03.15
  • Accepted : 2014.07.29
  • Published : 2014.12.01

Abstract

Super-critical $CO_2$ ($S-CO_2$) Brayton cycle has been considered to replace the current steam Rankine cycle in Sodium-cooled Fast Reactor (SFR) in order to improve the inherent safety and thermal efficiency. Several austenitic alloys are considered as the structural materials for high temperature $S-CO_2$ environment.. Microstructural change after long-term exposure to high temperature $S-CO_2$ environment could affect to the mechanical properties. In this study, candidate materials (austenitic stainless steels and Alloy 800HT) were exposed to $S-CO_2$ to assess oxidation resistance and the change in tensile properties. Loss of ductility was observed for some austenitic stainless steels even after 250 h exposure. The contribution of $S-CO_2$ environment on such changes was analyzed based on the characterization of the surface oxide and carburization of the materials in which 316H and 800H showed different oxidation behaviors.

Keywords

Supercritical Carbon Dioxide;Austenitic Alloys;Corrosion property;Tensile property

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Acknowledgement

Supported by : 미래창조과학부

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