한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제54권5호
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  • Pages.248-259
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  • 2021
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
DOI QR코드

DOI QR Code

화력발전용 슈퍼 듀플렉스 스테인리스 강 조관재의 용접 후 열처리 조건이 국부부식 저항성에 미치는 영향

Effects of post weld heat treatment conditions on localized corrosion resistance of super duplex stainless steel tube used for thermal power plant applications

  • 이준호 (순천대학교 신소재공학과) ;
  • 박진성 (순천대학교 신소재공학과) ;
  • 조동민 (순천대학교 신소재공학과) ;
  • 홍승갑 (포스코 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Lee, Jun Ho (Department of Advanced Materials Engineering, Suncheon National University) ;
  • Park, Jin sung (Department of Advanced Materials Engineering, Suncheon National University) ;
  • Cho, Dong Min (Department of Advanced Materials Engineering, Suncheon National University) ;
  • Hong, Seung Gab (POSCO Technical Research Laboratories) ;
  • Kim, Sung Jin (Department of Advanced Materials Engineering, Suncheon National University)
  • 투고 : 2021.10.01
  • 심사 : 2021.10.29
  • 발행 : 2021.10.31
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초록

This study examined the influence of post weld heat treatment (PWHT) conditions on corrosion behaviors of laser-welded super duplex stainless steel tube. Due to the high cooling rate of laser welding, the phase fraction of ferrite and austenite in the weld metal became unbalanced significantly. In addition, the Cr2N particles were precipitated adjacent to the fusion line, which can be susceptible to the localized corrosion. On the other hand, the phase fraction in the weld metal was restored at a ratio of 5:5 when exposed to temperatures above 1060 ℃ during the post weld heat treatment. Nevertheless, the high beltline speed during the PWHT, leading to the insufficient cooling rate, caused a precipitation of σ phase at the interface between ferrite/austenite in both weld metal and base metal. This resulted in the severe corrosion damages and significant decrease in critical pitting temperature (CPT), which was even lower than that measured in as-welded condition. Moreover, the fraction of σ phase in the center region of post weld heat treated steel tube was obtained to be higher than in the surface region. These results suggest that the PWHT conditions for the steel tube should be optimized to ensure the high corrosion resistance by excluding the precipitation of σ phase even in center region.

키워드

과제정보

This work was supported by a Research promotion program of SCNU.

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