Effect of Grain Size on Low Cycle Fatigue Life in Compressor Disc Superalloy GH4169 at 600 °C

作者: LL Liu , DY Hu , D Li , RG Hu , YX Gu

DOI: 10.1016/J.PROSTR.2017.11.075

关键词: CorrosionSuperalloyFracture (geology)Optical microscopeMaterials scienceInconelGrain sizeGas compressorComposite materialNickel

摘要: Abstract Nickel-based superalloy GH4169 in Chinese series (similar to Inconel 718 the U.S. and NC19FeNb France) has been widely used for aero-engine discs due its excellent fatigue, oxidation corrosion resistance at high temperature. The effect of grain size on low cycle fatigue (LCF) lifetime was investigated this study. Smooth specimens cut from an actual compressor disc a civil were conducted strain-controlled LCF tests 600 °C, results showed significant scattering lifetime. Then sizes estimated using optical microscope (OM) Image-Pro Plus (IPP) software. A negative correlation between found by inducing refinement strengthening theory. Afterwards, modified Smith-Watson-Topper (SWT) model developed describe dependence size. Finally, possible microscopic mechanism size-dependent behavior discussed based fracture analysis.

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