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

한국압력기기공학회 (Korean Society of Pressure Vessels and Piping)
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STS304L 및 STS316L 용접부의 응력 부식 균열 개선을 위한 저온 분사 코팅의 잔류 응력 감소 효과에 대한 연구

A Study on Residual Stress Reduction Effect of Cold Spray Coating to Improve Stress Corrosion Cracking of Stainless Steel 304L and 316L Welds

  • 박광용 (두산에너빌리티) ;
  • 심덕남 (두산에너빌리티) ;
  • 하종문 (두산에너빌리티) ;
  • 이상동 (두산에너빌리티) ;
  • 조성우 (두산에너빌리티)
  • Kwang Yong Park ;
  • Deog Nam Shim ;
  • Jong Moon Ha ;
  • Sang Dong Lee ;
  • Sung Woo Cho
  • 투고 : 2023.11.07
  • 심사 : 2023.12.22
  • 발행 : 2023.12.30
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초록

A Chloride-induced stress corrosion cracking (CISCC) of austenite stainless steel in dry cask storage system (DCSS) can occur with extending service time than originally designed. Cold spray coating (CSC) not only form a very dense microstructure that can protect from corrosive environments, but also can generate compressive stress on the surface. This characteristic of CSC process is very helpful to increase the resistance for CISCC. CSC with several powders, such as 304L, 316L and Ni can be optimized to form very dense coating layer. In addition, the impact energy generated as the CSC powder collides with the surface of base metal at a speed of Mach 2 or more can remove the residual tensile stress of welding area and serve the compress stress. CSC layers include no oxidation and no contamination with under 0.2% porosity, which is enough to protect from the penetration of corrosive chloride. Therefore, the CSC coating layer can be accompanied by a function that can be disconnected from the corrosive environment and an effect of improving the residual stress that causes CISCC, so the canister's CISCC resistance can be increased.

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과제정보

이 논문은 2019년도 정부(과학기술정보통신부)의 재원으로 한국연구재단 원자력기초연구지원사업의 지원을 받아 수행된 연구임(No. 1711097219)

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