Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Relationship Between Properties Degradation and Critical Aging Time of Super Austenitic and Duplex Stainless Steels

  • S. H. Choi (Department of Materials Science and Engineering, Andong National University) ;
  • Y. R. Yoo (Materials Research Centre for Energy and Clean Technology, Andong National University) ;
  • S. Y. Won (Department of Materials Science and Engineering, Andong National University) ;
  • G. B. Kim (Department of Materials Science and Engineering, Andong National University) ;
  • Y. S. Kim (Department of Materials Science and Engineering, Andong National University)
  • Received : 2023.10.14
  • Accepted : 2023.10.24
  • Published : 2023.10.30
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Abstract

The objective of this study was to analyze effects of aging time on property degradation of super austenitic stainless steel of PRE 52.8 and super duplex stainless steel of PRE 48.7. To analyze corrosion properties based on aging time, a critical pitting temperature test was performed in a solution of 6% FeCl3 + 1% HCl and an anodic polarization test was performed in deaerated 0.5N HCl + 1N NaCl solution at a temperature of 50 ℃. Surface hardness was measured to analyze mechanical properties. It was found that corrosion properties and mechanical properties deteriorated rapidly as aging time increased. Critical pitting temperature had the most effect on critical aging time at which property changes occurred rapidly, followed by pitting potential and hardness. This trend was found to be closely related to the fraction of sigma phase. Rate of sigma phase formation was found to be significantly faster in duplex stainless steel than in austenitic stainless steel.

Keywords

Acknowledgement

This research was supported by a grant from the 2023-2024 Research funds of Andong National University, and Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0008458, HRD Program for Industrial Innovation).

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