대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제49권9호
  • /
  • Pages.708-714
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  • 2011
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
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Premature Failure Analysis of Servovalve Components for a Thermal Power Plant

  • Chang, Sung-Yong (Power Integrity Group, Korea Electric Power Research Institute (KEPRI)) ;
  • Chang, Joong-Chel (Power Integrity Group, Korea Electric Power Research Institute (KEPRI)) ;
  • Kim, Bum-Soo (Power Integrity Group, Korea Electric Power Research Institute (KEPRI)) ;
  • Seo, Min-Woo (School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center (SPRC), Chonbuk National University) ;
  • Choi, Chel-Jong (School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center (SPRC), Chonbuk National University)
  • 발행 : 2011.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

The premature failure of a servovalve used for six months in a thermal power plant has been analyzed. The servovalve was made of stainless steel, containing 16Cr-0.44Mo, along with other elements. An overload of oil-supply pumping and an abnormal increase in the oil flux were observed during operation. A study revealed that erosion and corrosion could be the main causes of the failure. The visual examination of the servovalve did not show any appreciable damage. However, corrosion and erosion of the servovalve were observed using scanning electron microscopy (SEM). Upon examination of the servovalve, the corrosion was found to have occurred throughout the bushing and spool; however, erosion occurred at only the edge-side. In addition, the condition of the electrohydraulic control system (EHC) oil was investigated with respect to its satisfaction of the management standard.

키워드

과제정보

연구 과제번호 : Human Resource Development program

연구 과제 주관 기관 : Korea Institute of Energy Technology Evaluation and Planning (KETEP)

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