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Investigation of Fatigue Small Crack Propagation Behavior in Superalloy FGH96 under Different Stress Ratios

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Abstract

The characteristic analysis of fatigue small crack propagation behavior of superalloy FGH96 in a plane stress state was carried out based on a series of in situ scanning electron microscope fatigue tests. The influence of microstructure on fatigue small crack propagation behavior of superalloy FGH96 under the different stress ratios was investigated. The results indicated that the fatigue small crack growth rates showed obvious dependence on stress ratios, following as R = 0.5 > R = 0.2 > R = 0.1. Fatigue small crack propagation behavior of superalloy FGH96 occurred preferentially plastic slipping on grains surface and then resulted in a mixed model of intergranular and transgranular fracture during the fatigue small crack evolution. The effects of microstructural inhomogeneities (e.g., grain boundaries, defects, crystal orientation) on deflection and branching of fatigue small crack propagation were also evaluated.

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Abbreviations

a :

Crack length, μm

b :

The depth of the notch, μm

da/dN :

Fatigue crack propagation rate

C, n :

Fitted parameters in Paris formula

C 0, n 0, m :

Fitted parameters in Walker formula

COD:

Crack opening displacement

E :

Young’s modulus, GPa

EBSD:

Electron backscattering diffraction

FSCGR:

Fatigue small crack growth rate

GB:

Grain boundary

HIP:

Hot isostatic pressing

IPF:

Inverse pole figure

ΔK :

Stress intensity factor range, MPa·m1/2

ΔK th :

Threshold of stress intensity factor range, MPa·m1/2

KAM:

Kernel average misorientation

N :

Cycle number

R :

Stress ratio

SEM:

Scanning electron microscope

SIF:

Stress intensity factor

W :

The width of specimen, μm

σ max :

Maximum stress, MPa

σ 0 .2 :

0.2% Offset yield strength, MPa

σ b :

Ultimate tensile strength, Mpa

Δσ :

The stress range, MPa

δ :

Elongation ratio, %

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Acknowledgment

This work was supported by National Science and Technology Major Project, Grant Number [No. 2017-IV-0004-0041] and the National Natural Science Foundation of China [No. 11872225].

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Authors and Affiliations

  1. Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, People’s Republic of China

    A. Liu, Z. Liang & X. S. Wang

  2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, People’s Republic of China

    W. Xu, Y. Zhang & Y. H. He

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Correspondence to X. S. Wang.

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Liu, A., Liang, Z., Wang, X.S. et al. Investigation of Fatigue Small Crack Propagation Behavior in Superalloy FGH96 under Different Stress Ratios. J. of Materi Eng and Perform 32, 5554–5565 (2023). https://doi.org/10.1007/s11665-022-07505-w

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