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Frontiers of Mechanical Engineering

Front. Mech. Eng.    2019, Vol. 14 Issue (3) : 369-376     https://doi.org/10.1007/s11465-018-0489-7
RESEARCH ARTICLE
Creep-fatigue crack growth behavior in GH4169 superalloy
Dianyin HU1,2,3(), Xiyuan WANG1, Jianxing MAO1, Rongqiao WANG1,2,3()
1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China
2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China
3. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China
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Abstract

This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigue loading. Crack growth experiments were performed on compact tension specimens using trapezoidal waveform with dwell time at the maximum load at 650 °C. The crack growth rate of GH4169 superalloy significantly increased with dwell time. The grain boundaries oxidize during the dwell process, thereby inducing an intergranular creep-fatigue fracture mode. In addition, testing data under the same dwell time showed scattering at the crack growth rate. Consequently, a modified model based on the Saxena equation was proposed by introducing a distribution factor for the crack growth rate. Microstructural observation confirmed that the small grain size and high volume fraction of the d phase led to a fast creep-fatigue crack growth rate at 650 °C, thus indicating that two factors, namely, fine grain and presence of the d phase at the grain boundary, increased the amount of weakened interface at high temperature, in which intergranular cracks may form and propagate.

Keywords crack growth rate      creep-fatigue      GH4169 superalloy      CT specimen      dwell time     
Corresponding Authors: Dianyin HU,Rongqiao WANG   
Just Accepted Date: 12 December 2017   Online First Date: 05 January 2018    Issue Date: 24 July 2019
 Cite this article:   
Dianyin HU,Xiyuan WANG,Jianxing MAO, et al. Creep-fatigue crack growth behavior in GH4169 superalloy[J]. Front. Mech. Eng., 2019, 14(3): 369-376.
 URL:  
http://journal.hep.com.cn/fme/EN/10.1007/s11465-018-0489-7
http://journal.hep.com.cn/fme/EN/Y2019/V14/I3/369
Chemical composition Weight percent/(wt.%)
Cr 18.930
Fe 19.460
Nb 5.110
Ti 1.030
Al 0.530
Mo 3.020
Co 0.080
C 0.035
Si 0.080
Mn 0.030
S, P, B <0.006
Ni Bal.
Tab.1  Chemical composition of GH4169 superalloy
Fig.1  Diagram of semi-manufactured turbine disc and geometry of CT specimen (unit: mm)
Fig.2  Waveforms used in creep-fatigue crack growth experiments: (a) For specimen #01 and (b) for specimens #02–#05
Fig.3  Creep-fatigue crack growth rate of GH4169 superalloy under two dwell times
Fig.4  Fracture images of specimens under different dwell times, where DK = 48.6 MPa?m1/2 and secondary cracks are indicated by arrows: (a) #01 with 100 s dwell time and (b) #02 with 25 s dwell time
Fig.5  Scatter in crack growth rate with same dwell time
Fig.6  Schematic diagram of superposed creep-fatigue crack growth curve
Parameter Value
C 1.547×10−7
m 2.568
B 4.102×10−10
p 2.329
R2 0.9723
Tab.2  Fitting results based on Saxena model under 25 s dwell time condition
Specimen number Distribution factor Average grain diameter/mm Volume fraction of d phase/%
#02 0.661 10.58 4.90
#03 0.907 12.71 3.50
#04 1.079 13.62 5.06
#05 1.171 11.41 2.61
Tab.3  Metallographic parameters and distribution factors of the specimens
Fig.7  Optical microscopy images: (a,b) Specimen #02 and (c,d) Specimen #04 (The d phases are marked by white arrows.)
Fig.8  Optical microscopy images: (a,b) Specimen #03 and (c,d) Specimen #05 (The d phases are marked by white arrows.)
Fig.9  Fracture images of specimen #03 observed by scanning electron microscope (The zigzag grain boundaries are marked by white arrows.)
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