Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Development of Method for In-situ Micro-Scale Observation of Stress Corrosion Cracking in High-Temperature Primary Water Environment

원전 고온 1차수 환경에서 응력부식균열의 실시간 마이크로 스케일 관찰 방법 개발

  • Jung-Ho Shin (Materials Safety Technology Research Division, Korea Atomic Energy Research Institute) ;
  • Jong-Yeon Lee (Materials Safety Technology Research Division, Korea Atomic Energy Research Institute) ;
  • Sung-Woo Kim (Materials Safety Technology Research Division, Korea Atomic Energy Research Institute)
  • 신정호 (한국원자력연구원 재료안전기술연구부) ;
  • 이종연 (한국원자력연구원 재료안전기술연구부) ;
  • 김성우 (한국원자력연구원 재료안전기술연구부)
  • Received : 2023.04.15
  • Accepted : 2023.04.20
  • Published : 2023.08.30
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Abstract

The aim of this study was to develop a new in-situ observation method and instrument in micro-scale to investigate the mechanism of stress corrosion cracking (SCC) initiation of Ni-base alloys in a high temperature water environment of pressurized water reactors (PWRs). A laser confocal microscope (LCM), an autoclave with diamond window view port, and a slow strain-rate tester with primary water circulation loop system were components of the instrument. Diamond window, one of the core components of the instrument, was selected based on its optical, chemical, and mechanical properties. LCM was used to observe the specimen in micro-scale, considering the experimental condition of a high-temperature primary water environment. Using in-situ method and instrument, it is possible to observe oxidation and deformation of specimen surface in micro-scale through the diamond window in a high-temperature primary water in real-time. The in-situ method and instrument developed in this work can be utilized to investigate effects of various factors on SCC initiation in a high-temperature water environment.

Keywords

Acknowledgement

본 연구는 한국연구재단을 통해 과기부 연구개발사업(2021M2E4A1037979, RS-2022-00143718)의 지원을 받아 수행되었다.

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