한국압력기기공학회 논문집 (Transactions of the Korean Society of Pressure Vessels and Piping)

한국압력기기공학회 (Korean Society of Pressure Vessels and Piping)
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염화물 환경에서 스테인리스강 용접부의 공식저항성 향상을 위한 마찰교반공정 적용효과에 관한 연구

A study on the Application Effect of Friction Stir Processing for Enhanced Pitting Corrosion Resistance of Stainless Steel Welds in Chloride Environment

  • 하종문 (두산에너빌리티) ;
  • 심덕남 (두산에너빌리티) ;
  • 김승현 (한국재료연구원)
  • Jong Moon Ha ;
  • Deog Nam Shim ;
  • Seung Hyun Kim
  • 투고 : 2023.11.07
  • 심사 : 2023.12.15
  • 발행 : 2023.12.30
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초록

As temporary storage facilities for spent nuclear fuels in domestic nuclear power plants are expected to be saturated, external intermediate storage facilities would be required in the future. Spent nuclear fuels are stored in metal canisters and then placed in a dry environment within concrete or metal casing for operation. In the United States, the dry storage method for spent nuclear fuels has been operated for an extended period. Based on the corrosion experiences of dry storage canisters in chloride environments, numerous studies have been conducted to reduce corrosion in welds. With the construction of intermediate storage facilities in Korea for spent nuclear fuels expected near coastal areas adjacent to nuclear power plants, there is a need for research on the corrosion occurrence of welds and mitigation methods for canisters in chloride environments. In this paper, we measured and compared the residual stresses in the Heat-Affected Zones (HAZ) after electron beam welding (EBW) and gas tungsten arc welding (GTAW) processes for candidate materials such as 304L, 316L, and duplex stainless steel(DSS). We investigated the possibility of microstructure control through the application of surface modification processes using friction stir processing (FSP). Corrosion tests on each welded specimen revealed a higher corrosion rate in EBW welds compared to GTAW. Furthermore, it was confirmed that corrosion resistance improved due to phase refinement and redistribution of precipitates when FSP was applied.

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과제정보

본 연구는 한국연구재단이 주관하는 원자력기초연구지원사업의 건식저장용기 CISCC 저항성 향상을 위한 통합혁신기술 개발과제의 일환으로 수행되었습니다.

참고문헌

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