Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2000.04a
- /
- Pages.188-193
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- 2000
Thermo-Mechancal Fatigue of the Nickel Base Superalloy IN738LC for Gas Turbine Blades
가스터빈 블레이드용 IN738LC의 열기계피로수명에 관한 연구
- Fleury, E. ;
- Ha, J.S. ;
-
Hyun, J.S.
;
- Jang, S.W. ;
- Jung, H.
- Published : 2000.04.20
Abstract
A more accurate life prediction for gas turbine blade takes into account the material behavior under the complex thermo-mechanical fatigue(TMF) cycles normally encountered in turbine operation. An experimental program has been carried out to address the thermo-mechanical fatigue life of the IN738LC nickel-base superalloy. In the first phase of the study, out-of-phase and in-phase TMF experiments have been performed on uncoated and coated materials. In the temperature range investigated. the deposition of NiCrAlY air plasma sprayed coating did not affect the fatigue resistance. In the second phase of the study, a physically-base life prediction model that takes into account of the contribution of different damage mechanisms has been applied. This model was able to reflect the temperature and strain rate dependences of isothermal cycling fatigue lives, and the strain-temperature history effect on the thermo-mechanical fatigue lives.
Keywords