Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Improvement of Chloride Induced Stress Corrosion Cracking Resistance of Welded 304L Stainless Steel by Ultrasonic Shot Peening

  • Hyunhak Cho (Department of Materials Science and Engineering, Andong National University) ;
  • Young Ran Yoo (Materials Research Centre for Energy and Clean Technology, Andong National University) ;
  • Young Sik Kim (Department of Materials Science and Engineering, Andong National University)
  • Received : 2024.07.10
  • Accepted : 2024.07.31
  • Published : 2024.08.30
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Abstract

Due to its good corrosion and heat resistance with excellent mechanical properties, 304L stainless steel is commonly used in the fabrication of spent nuclear fuel dry storage canisters. However, welds are sensitive to stress corrosion cracking (SCC) due to residual stress generation. Although SCC resistance can be improved by stress relieving the weld and changing the chloride environment, it is difficult to change corrosion environment for certain applications. Stress control in the weld can improve SCC resistance. Ultrasonic shot peening (USP) needs further research as compressive residual stresses and microstructure changes due to plastic deformation may play a role in improving SCC resistance. In this study, 304L stainless steel was welded to generate residual stresses and exposed to a chloride environment after USP treatment to improve SCC properties. Effects of USP on SCC resistance and crack growth of specimens with compressive residual stresses generated more than 1 mm from the surface were studied. In addition, correlations of compressive residual stress, grain size, intergranular corrosion properties, and pitting potential with crack propagation rate were determined and the improvement of SCC properties by USP was analyzed.

Keywords

Acknowledgement

This research was supported by a grant from the 2023-2024 research funds of Andong National University.

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