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Low-Cycle Fatigue Life Prediction in GTD-111 Superalloy at Elevated Temperatures

초내열합금 GTD-111의 고온 저주기피로 수명예측

  • Received : 2010.12.14
  • Accepted : 2011.04.22
  • Published : 2011.07.01

Abstract

The Ni-base super-heat-resistant alloy, GTD-111, is employed in gas turbines because of its high temperature strength and oxidation resistance. It is important to predict the fatigue life of this superalloy in order to improve the efficiency of gas turbines. In this study, low-cycle fatigue tests are performed as variables of total strain range and temperature. The relationship between the strain energy density and number of cycles to failure is examined in order to predict the low-cycle fatigue life of the GTD-111 superalloy. The fatigue life predicted by using the strain-energy methods is found to coincide with that obtained from the experimental data and from the Coffin-Manson method.

Keywords

GTD-111;Low Cycle Fatigue;Superalloy;Life Prediction;Strain Energy Method

Acknowledgement

Supported by : 전력연구원

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