Evaluation of High-Temperature Tensile Property of Diffusion Bond of Austenitic Alloys for S-CO2 Cycle Heat Exchangers

고온 S-CO2 사이클 열교환기용 스테인리스강 및 Fe-Cr-Ni 합금 확산 접합부의 고온 인장 특성평가

  • Hong, Sunghoon (Dept. of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Sah, Injin (Dept. of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology) ;
  • Jang, Changheui (Dept. of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
  • 홍성훈 (한국과학기술원 원자력 및 양자공학과) ;
  • 사인진 (한국과학기술원 원자력 및 양자공학과) ;
  • 장창희 (한국과학기술원 원자력 및 양자공학과)
  • Received : 2014.03.17
  • Accepted : 2014.05.28
  • Published : 2014.12.01


To improve the inherent safety of the sodium-cooled fast reactor (SFR), the supercritical $CO_2$ ($S-CO_2$) Brayton cycle is being considered as an alternative power conversion system to steam the Rankine cycle. In the $S-CO_2$ system, a PCHE (printed circuit heat exchanger) is being considered. In this type of heat exchangers, diffusion bonding is used for joining the thin plates. In this study, the diffusion bonding characteristics of various austenitic alloys were evaluated. The tensile properties were measured at temperatures starting from the room temperature up to $650^{\circ}C$. For the 316H and 347H types of stainless steel, the tensile ductility was well maintained up to $550^{\circ}C$. However, the Incoloy 800HT showed lower strength and ductility at all temperatures. The microstructure near the bond line was examined to understand the reason for the loss of ductility at high temperatures.


Diffusion Bonding;PCHE(Printed Circuit Heat Exchanger);Austenitic Alloys;Tensile Ductility


Supported by : 미래창조과학부


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