Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Effect of Aging Treatment on Pitting Corrosion of Super Duplex Stainless Steel Weld Metal

슈퍼듀플렉스강 용접금속의 공식에 미치는 시효처리의 영향

  • Lee, Jae-Hyoung (Department of Metallurgical Engineering, Graduate School, Pukyong National University) ;
  • Seo, Gi-Jeong (Department of Metallurgical Engineering, Graduate School, Pukyong National University) ;
  • Jung, Byong-Ho (Department of Metallurgical Engineering, Pukyong National University) ;
  • Kang, Chang-Yong (Department of Metallurgical Engineering, Pukyong National University)
  • 이재형 (부경대학교 대학원 금속공학과) ;
  • 서기정 (부경대학교 대학원 금속공학과) ;
  • 정병호 (부경대학교 금속공학과) ;
  • 강창룡 (부경대학교 금속공학과)
  • Received : 2013.12.23
  • Accepted : 2014.03.04
  • Published : 2014.04.30
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Abstract

A specimen of weld metal was prepared by GTA welding with weld wire of super duplex stainless steel. Aging treatment was conducted for the sample at the temperature range of 700 to $900^{\circ}C$ for 5 to 300 minutes. The effect of aging temperature and time to pitting corrosion of weld metal has been investigated and the results were derived as follows. The volume fraction of ${\sigma}$ phase tends to increase with an increase of aging temperature and time. Pitting potential Ep representing pitting corrosion was found to tend to decrease with an increase of aging time at 700 to $900^{\circ}C$. And most of the pits formed near the ${\sigma}$-phase in the ferrite and seemed to propagated to austenite.

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References

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