Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Evaluation of Low Cycle Fatigue Damage of Gas Turbine Blades Used for a Long Time

장시간 사용된 가스터빈 블레이드의 저주기피로 손상도 평가

  • Heo, In Kang (Department of Mechanical Engineering, Chungnam National University) ;
  • Kim, Jae Hoon (Department of Mechanical Engineering, Chungnam National University)
  • Received : 2018.04.06
  • Accepted : 2018.06.21
  • Published : 2018.06.30
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Abstract

Ni-base superalloy has excellent resistance to extreme environments such as high temperatures and high stresses and are used as materials for large gas turbines. In this paper, the specimens were taken from the blade that were used for a long time, and their life span was studied by microstructure analysis and avoidance of cursing. The microstructural analysis of the specimens was carried out using a OM and SEM to observe the coarsening, carbides on gamma prime. Low-cycle fatigue tests were performed on new material and airfoil of long time-used blade. The test was conducted under various deformation conditions and temperature conditions of $760^{\circ}C$ and $870^{\circ}C$. The low cycle fatigue test was carried out using the Coffin-Manson equation and the fatigue life was predicted. After the test, crack path and fracture surface were analyzed using SEM.

Keywords

References

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