Grain size effect on multi-scale fatigue crack growth mechanism of Nickel-based alloy GH4169

Qin, Chenghua; Zhang, Xiancheng; Ye, Shen; Tu, Shan‐Tung

doi:10.1016/j.engfracmech.2015.06.003

Cited by 53 publications

(19 citation statements)

References 21 publications

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“…The nickel-based superalloy GH4169 is widely used in aero-engines for its relatively high-temperature strength, good oxidation resistance, and easy formability. [2][3][4][5] In this paper, the present model was used to simulate the deformation behavior and estimate the fatigue crack initiation life of a GH4169 superalloy with full details proposed in Chen's work. 54 The microstructure of this alloy is shown in Figure 2.…”

Section: Numerical Implementationmentioning

confidence: 99%

“…In those approaches, FIPs are always averaged over a mesoscopic volume, i.e., slip bands, grains 7,26,27 . Besides, detailed experimental observations of Ni‐based superalloy have shown that the fatigue crack initiation mode is predominantly transgranular 2–4,42 . Grain volume averaged FIPs may be enough for the fatigue crack initiation simulating and life prediction.…”

Section: Introductionmentioning

confidence: 99%

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A microstructure‐based homogenization model for predicting the low‐cycle fatigue initiation life of GH4169 superalloy

Mao

2021

Fatigue Fract Eng Mat Struct

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A microstructure-based homogenization model is proposed for simulating the cyclic plasticity and predicting the low-cycle fatigue (LCF) crack initiation life of GH4169 superalloy. Classical crystal plastic model (CPM) with a simple softening model is used at the grain level. Then, the transition from grain level to polycrystal level is based on the conservation of virtual work between the two levels. The Eshelby's formulation is applied in the model. Especially, local influences of grain interactions are considered by introducing the external Eshelby's tensor. Relatively precise macroresults and microresults as the finite element method can be provided by the present model with less computational cost. Grain volume averaged fatigue indicator parameters (FIPs) with considering the effect of inclusions are formed to predict the LCF crack initiation life, and a fold-line fitting model is proposed to substitute for the cycle-by-cycle simulation. Predicted lives fit well with the experimental data for both the strain loading and stress loading simulations. Scatter of the life can also be predicted by the model and overwhelming influences of the incubation stage on the variability of LCF initiation life can be captured. It is shown that the inclusions and the inhomogeneous plastic strain are responsible for the scatter of the incubation stage.

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Section: Numerical Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A microstructure‐based homogenization model for predicting the low‐cycle fatigue initiation life of GH4169 superalloy

Mao

2021

Fatigue Fract Eng Mat Struct

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“…It has been shown in [30] that the effective grain size in a polycrystalline material may influence the mechanism of yielding or failure. Moreover, it has been shown in [31] that the fatigue crack growth behaviour of the material is sensitive to the material grain size.…”

Section: Variation Of Mechanical Behaviour In Different Grainsmentioning

confidence: 99%

Sensitivity Analysis of Material Microstructure Effects on Predicted Crack Paths Using Finite Element Simulations

Jacob

Mehmanparast

2016

J. Multiscale Modelling

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The effects of microstructure, grain and grain boundary (GB) properties on predicted damage paths and indicative crack propagation direction have been examined for a polycrystalline material using mesoscale finite element simulations. Numerical analyses were carried out on a compact tension specimen geometry containing granular mesh structures with random grain shapes and sizes of average diameter 100[Formula: see text][Formula: see text]m. Nanoindentation tests were performed to investigate the dependency of mesoscale hardness measurements on the indentation location with respect to grain and GB regions. Finite element results have shown that under tensile loading conditions, the predicted damage paths are very sensitive to the granular mesh structure, GB properties and individual grain properties. Furthermore, finite element results have revealed that the cracking mode (i.e., transgranular/intergranular) and maximum crack deviation angle are strongly dependent on the material microstructures employed in simulations.

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“…Zhang et al [14] indicated that a nickel-based superalloy with fine grains showed longer fatigue life than that of a nickel-based superalloy with coarser grains at the same total strain amplitude. Moreover, the smaller the grain size, the greater the proportion of the small fatigue crack stage in the total fatigue life of the nickel-based superalloy GH4169 [15]. Gribbin et al [16] researched the role of porosity in the direct metal laser sintered Inconel alloy 718 and found that the porosity has less effect on the fatigue life compared to annealing.…”

Section: Introductionmentioning

confidence: 99%

Effects of the γ″-Ni3Nb Phase on Fatigue Behavior of Nickel-Based 718 Superalloys with Different Heat Treatments

Ling

Yin

et al. 2019

Materials

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The effects of the γ″-Ni3Nb phase on fatigue behavior of nickel-based 718 superalloys with standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging were investigated by scanning electron microscope, transmission electron microscopy, and fatigue experiments. The standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging resulted in the formation of more and smaller γ″ phases in the matrix in the nickel-based 718 superalloys. However, the grain boundaries of the hot isostatic pressing + direct aging sample showed many relatively coarse disk-like γ″ phases with major axes of ~80 nm and minor axes of ~40 nm. The hot isostatic pressing + direct aging sample with a stress amplitude of 380 MPa showed the longest high cycle fatigue life of 5.16 × 105 cycles. Laves phases and carbide inclusions were observed in the crack initiation zone, and the cracks propagated along the acicular δ phases in the nickel-based 718 superalloys. The precipitation of fine γ″ phases in the matrix and relatively coarse γ″ phases in the grain boundaries of the hot isostatic pressing + direct aging sample can hinder the movement of dislocation.

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Grain size effect on multi-scale fatigue crack growth mechanism of Nickel-based alloy GH4169

Cited by 53 publications

References 21 publications

A microstructure‐based homogenization model for predicting the low‐cycle fatigue initiation life of GH4169 superalloy

A microstructure‐based homogenization model for predicting the low‐cycle fatigue initiation life of GH4169 superalloy

Sensitivity Analysis of Material Microstructure Effects on Predicted Crack Paths Using Finite Element Simulations

Effects of the γ″-Ni3Nb Phase on Fatigue Behavior of Nickel-Based 718 Superalloys with Different Heat Treatments

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