한국안전학회지 (Journal of the Korean Society of Safety)

  • 제28권3호
  • /
  • Pages.18-22
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  • 2013
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  • 1738-3803(pISSN)
  • /
  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
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코발트기 초내열합금 ECY768의 고온 저주기피로 거동

Low Cycle Fatigue Behavior of Cobalt-Base Superalloy ECY768 at Elevated Temperature

  • Yang, Ho-Young (Department of Mechanical Design Engineering, Chungnam National University) ;
  • Kim, Jae-Hoon (Department of Mechanical Design Engineering, Chungnam National University) ;
  • Ha, Jae-Suk (Department of Mechanical Design Engineering, Chungnam National University) ;
  • Yoo, Keun-Bong (Power Generation Laboratory, Korea Electric Power Research Institute) ;
  • Lee, Gi-Chun (Reliability Assessment Center, Korea Institute of Machinery and Materials)
  • 투고 : 2012.09.06
  • 심사 : 2013.05.23
  • 발행 : 2013.06.30
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초록

The Co-base super heat resisting alloy ECY768 is employed in gas turbine because of its high temperature strength and oxidation resistance. The prediction of fatigue life for superalloy is important for improving the efficiency. In this paper, low cycle fatigue tests are performed as variables of total strain range and temperature. The relations between strain energy density and number of cycle to failure are examined in order to predict the low cycle fatigue life of ECY768 super alloy. The lives predicted by strain energy methods are found to coincide with experimental data and results obtained from the Coffin-Manson method. The fatigue lives is evaluated using predicted by Coffin-Manson method and strain energy methods is compared with the measured fatigue lives at different temperatures. The microstructure observing was performed for how affect able to low-cycle fatigue life by increasing the temperature.

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참고문헌

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