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

L. L. Liu; D. Y. Hu; D. Li; R. G. Hu; Y. X. Gu; R. Q. Wang

doi:10.1016/j.prostr.2017.11.075

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

L. L. Liu
, D. Y. Hu^*
, D. Li
, R. G. Hu
, Y. X. Gu
, R. Q. Wang

^*Corresponding author for this work

Beihang University
Collaborative Innovation Center of Advanced Aero-Engine
Beijing Key Laboratory of Aero-Engine Structure and Strength
Aero Engine Corporation of China

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

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

Original language	English
Pages (from-to)	174-181
Number of pages	8
Journal	Procedia Structural Integrity
Volume	7
DOIs	https://doi.org/10.1016/j.prostr.2017.11.075
State	Published - 2017

Keywords

fracture mechanism
grain size
lifetime prediction
low cycle fatigue

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10.1016/j.prostr.2017.11.075

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@article{95e3f7535e1c4f55b17ec015c97dda46,

title = "Effect of Grain Size on Low Cycle Fatigue Life in Compressor Disc Superalloy GH4169 at 600 °c",

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

keywords = "fracture mechanism, grain size, lifetime prediction, low cycle fatigue",

author = "Liu, \{L. L.\} and Hu, \{D. Y.\} and D. Li and Hu, \{R. G.\} and Gu, \{Y. X.\} and Wang, \{R. Q.\}",

note = "Publisher Copyright: {\textcopyright} 2017 The Autors. Published By Elsevier B.V.",

year = "2017",

doi = "10.1016/j.prostr.2017.11.075",

language = "英语",

volume = "7",

pages = "174--181",

journal = "Procedia Structural Integrity",

issn = "2452-3216",

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}

TY - JOUR

T1 - Effect of Grain Size on Low Cycle Fatigue Life in Compressor Disc Superalloy GH4169 at 600 °c

AU - Liu, L. L.

AU - Hu, D. Y.

AU - Li, D.

AU - Hu, R. G.

AU - Gu, Y. X.

AU - Wang, R. Q.

PY - 2017

Y1 - 2017

N2 - Nickel-based superalloy GH4169 in Chinese series (similar to Inconel 718 in the U.S. and NC19FeNb in France) has been widely used for aero-engine discs due to its excellent fatigue, oxidation and corrosion resistance at high temperature. The effect of grain size on the low cycle fatigue (LCF) lifetime was investigated in this study. Smooth specimens cut from an actual compressor disc in a civil aero-engine were conducted to strain-controlled LCF tests at 600 °C, and results showed a significant scattering in the LCF lifetime. Then grain sizes of specimens were estimated using optical microscope (OM) and Image-Pro Plus (IPP) software. A negative correlation between the grain size and LCF lifetime was found by inducing the grain refinement strengthening theory. Afterwards, a modified Smith-Watson-Topper (SWT) model was developed to describe the dependence of LCF lifetime on grain size. Finally, the possible microscopic mechanism of the grain size-dependent LCF behavior of GH4169 superalloy was discussed based on fracture analysis.

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

KW - fracture mechanism

KW - grain size

KW - lifetime prediction

KW - low cycle fatigue

UR - https://www.scopus.com/pages/publications/85065878811

U2 - 10.1016/j.prostr.2017.11.075

DO - 10.1016/j.prostr.2017.11.075

M3 - 文章

AN - SCOPUS:85065878811

SN - 2452-3216

VL - 7

SP - 174

EP - 181

JO - Procedia Structural Integrity

JF - Procedia Structural Integrity

ER -

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

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Keywords

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