Nuclear Engineering and Technology

  • 제55권2호
  • /
  • Pages.555-565
  • /
  • 2023
  • /
  • 1738-5733(pISSN)
  • /
  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Evaluation of radiation resistance of an austenitic stainless steel with nanosized carbide precipitates using heavy ion irradiation at 200 dpa

  • Ji Ho Shin (Central Research Institute, Korea Hydro and Nuclear Power Co., Ltd.) ;
  • Byeong Seo Kong (Korea Advanced Institute of Science and Technology) ;
  • Chaewon Jeong (Korea Advanced Institute of Science and Technology) ;
  • Hyun Joon Eom (Korea Advanced Institute of Science and Technology) ;
  • Changheui Jang (Korea Advanced Institute of Science and Technology) ;
  • Lin Shao (Department of Nuclear Engineering, Texas A&M University)
  • 투고 : 2022.06.08
  • 심사 : 2022.09.29
  • 발행 : 2023.02.25
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초록

Despite many advantages as structural materials, austenitic stainless steels (SSs) have been avoided in many next generation nuclear systems due to poor void swelling resistance. In this paper, we report the results of heavy ion irradiation to the recently developed advanced radiation resistant austenitic SS (ARES-6P) with nanosized NbC precipitates. Heavy ion irradiation was performed at high temperatures (500 ℃ and 575 ℃) to the damage level of ~200 displacement per atom (dpa). The measured void swelling of ARES-6P was 2-3%, which was considerably less compared to commercial 316 SS and comparable to ferritic martensitic steels. In addition, increment of hardness measured by nano-indentation was much smaller for ARES-6P compared to 316 SS. Though some nanosized NbC precipitates were dissociated under relatively high dose rate (~5.0 × 10-4 dpa/s), sufficient number of NbC precipitates remained to act as sink sites for the point defects, resulting in such superior radiation resistance.

키워드

과제정보

This study was mainly supported by the National Research Foundation (NRF) of the MSIT of the Republic of Korea as an Engineering Research Center (No. 2016R1A5A101391921) and Nuclear R&D Program (2019M1A7A1A0208834412). Authors appreciate POSCO for helping with the manufacturing of ingots and conducting the thermo-mechanical processing. In addition, we are grateful to the staff in the Texas A&M Ion Beam Lab. for heavy ion irradiation experiments.

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