Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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A Study on the Oxidation Behaviors of Power Plant Valve Materials under the Ultra Super Critical Condition

초초 임계 화력 발전소용 밸브 소재의 산화 거동

  • Lee, J.S. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Cho, T.Y. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Yoon, J.H. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Joo, Y.G. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Song, K.O. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Cho, J.Y. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Kang, J.H. (School of Nano and Advanced Materials Engineering, Changwon National University) ;
  • Lee, S.H. (Doosan Heavy Industries & Construction Co. Ltd.) ;
  • Uhm, K.W. (Doosan Heavy Industries & Construction Co. Ltd.) ;
  • Lee, J.W. (Doosan Heavy Industries & Construction Co. Ltd.)
  • 이준섭 (창원대학교 나노신소재공학부) ;
  • 조동율 (창원대학교 나노신소재공학부) ;
  • 윤재홍 (창원대학교 나노신소재공학부) ;
  • 주윤곤 (창원대학교 나노신소재공학부) ;
  • 송기오 (창원대학교 나노신소재공학부) ;
  • 조재영 (창원대학교 나노신소재공학부) ;
  • 강진호 (창원대학교 나노신소재공학부) ;
  • 이선호 (두산 중공업(주)) ;
  • 엄기원 (두산 중공업(주)) ;
  • 이종욱 (두산 중공업(주))
  • Published : 2009.02.28
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Abstract

Recently ultra-supercritical steam power plants operate at $1000^{\circ}F$ ($538^{\circ}C$) and 3500 psi (24.1 MPa). Thermal efficiency of power plant will be increased about 2% if steam temperature increases from $1000^{\circ}F$ to $1150^{\circ}F$ ($621^{\circ}C$). In this study valve materials Incoloy901 (IC901) and Inconel718 (IN718) were nitrided to improve the surface hardness and solid lubrication function of the valve materials. The hardness of both IC901 and IN718 increased about two times by ion nitriding. IC901, IN718 and their nitrided specimens were corroded under ultra super-critical condition (USC) of $621^{\circ}C$. and 3600 psi (24.8 MPa) for 2000 hours. Oxidations of both IC901 and IN718 were very small due to the formation of protective oxide layer on the surface. But the corrosion resistance of both nitrided specimens decreased because of the formation of non-protective nitride layer of $Fe_{4}N$, $Fe_{2}N$ and CrN on the surface layer. The hardness of both nitrided IC901 and IN718 at $20{\mu}m$ depth from the surface decreased about 30% and 20% respectively by USC 2000 hours.

Keywords

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