Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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The Consideration of the Damage in Gas Turbine Hot Parts for Repair Bonding Process

가스터빈 고온부품의 재생 접합을 위한 손상부 파악

  • 김성욱 (한양대학교 신소재공학부) ;
  • 최철 (한전 전력연구원 발전연구실) ;
  • 김재철 (한전 전력연구원 발전연구실) ;
  • 이창희 (한양대학교 신소재공학부)
  • Published : 2003.05.31
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Abstract

The present study was aimed at analysing the damage of a used gas turbine bucket after 39,500h of total service. Microstructures and cracks of service-induced bucket were observed. The crack might have initiated from the coating in the bucket surface by thermal fatigue and propagated into the GTD111 base metal. Maximum depth of penetration was 2.7 mm(full penetration) at the leading edge. Crack contains a lot of Cr-,Ti-,Al-oxide which will prohibit filling and wetting of insert metal. Depth and propagation direction of crack were accorded with centrifugal force and temperature distribution in turbine bucket. Present result will provide basic data for repair bonding process.

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