Crack formation and microstructure-sensitive propagation in low cycle fatigue of a polycrystalline nickel-based superalloy with different heat treatments
作者： Yahui Liu , Maodong Kang , Yun Wu , Mengmeng Wang , Min Li
DOI: 10.1016/J.IJFATIGUE.2017.10.012
关键词:
摘要: Abstract Gas turbine engine materials demand high performance of fatigue life under alternative loading. In this paper, crack initiation and propagation in the low cycle (LCF) a polycrystalline nickel based superalloys was studied via experimental numerical methods. LCF experiments were conducted with specimens subjected to different heat treatment regimes, including standard (SHT), isostatic pressing (HIP), combined (HIP+SHT). Simulations on finite element method (FEM) implemented 3D digital model obtained from synchrotron radiation X-ray computerized tomography (CT) investigate effect microporosity. Results indicated that microporosity dominant factor parameters porosity, effective diameter, distribution co-contributed affect life. The δ stack carbide observed be sites. HIP specimen had long since casting pore acicular eliminated, while further SHT can reintroduce into matrix resulting strength behaviors HIP+SHT superalloy depended surface quality, stress concentration, quantity carbide.
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