Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Localized Corrosion Resistance and Microstructural Changes in UNS N07718 Alloy After Solution Heat Treatment

  • Yoon-Hwa Lee (School of Materials Science and Engineering, Changwon National University) ;
  • Jun-Seob Lee (School of Materials Science and Engineering, Changwon National University) ;
  • Soon il Kwon (R&D Center, SeAH CSS corporation) ;
  • Jungho Shin (R&D Center, SeAH CSS corporation) ;
  • Je-Hyun Lee (School of Materials Science and Engineering, Changwon National University)
  • Received : 2024.02.21
  • Accepted : 2024.03.20
  • Published : 2024.04.30
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Abstract

The localized corrosion resistance of UNS N07718 alloy was investigated after solution heat treatment. When the alloy was heat-treated at 1050 ℃ for 2.5 hours, it experienced an increase in average grain diameter, a reduction in grain boundary area, and the dissolution of delta phases along grain boundaries. Additionally, primary metallic nitrides (MN) and metallic carbides (MC), enriched with either Ti or Nb, were identified and exhibited a random distribution within the microstructures. Despite the solution heat treatment, the composition, diameter, and abundance of MNs and MCs remained relatively consistent. The critical pitting temperature (CPT), as determined by the ASTM G48-C immersion test, revealed similar values of 45 ℃ for both treated and untreated alloys. However, a decrease in maximum pit depth and corrosion rate was observed after the solution heat treatment. The microstructural changes that occurred during the heat treatment and their potential implications were discussed to understand the influence of the solution heat treatment.

Keywords

Acknowledgement

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20214000000480, Development of R&D engineers for combined cycle power plant technologies).

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