Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650 °C

Zhu, Xu-Min; Gong, Cong-Yang; Jia, Yunfei; Wang, Run-Zi; Zhang, Chengcheng; Fu, Yao; Tu, Shan‐Tung; Zhang, Xiancheng

doi:10.1016/j.jmst.2019.03.023

Cited by 61 publications

(25 citation statements)

References 26 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%

“…The effect of the grain size on the LCF performance of alloys has been observed in experimental studies. Previous work indicated that the incubation mechanism of microcrack depends on the relative sizes of the grains and inclusions 3,6 . Fatigue cracks are found preferentially initiated at inclusions when the size of grains is smaller than inclusions and initiated at persistent slip bands when the size of grains is larger than inclusions.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the fatigue failure of the polycrystalline Ni-based superalloy includes four stages: microcracks incubation, microstructurally small crack growth, small crack propagation, and long crack propagation. [1][2][3] Among all stages, the microstructurally small crack incubation and growth stages can be treated as the small crack initiation stage. Then, the fatigue initiation life is defined as the number of cycles required for the first two stages.…”

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%

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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“…Thus, to obtain a suitable forming process, lots of studies have been done on the microstructural evolution and flow behaviors of diverse Ni-base superalloys, such as C276 [11], FGH100 [12], Incoloy 901 [13], Nimonic 80A [14], NiTi intermetallic compound [15], Ni-20.0Cr-2.5Ti-1.5Nb-1.0Al Ni-base superalloy [16], GH4698 [17], GH925 [18], Ni-59Cr-11.4Co-13.5Mo-5.6 alloy [19,20], and GH4169 superalloy [21,22]. Generally, the uniform and fine grain microstructure is hoped for the forgings of Ni-based superalloys [23][24][25][26]. However, it was found that the uniform and fine grain microstructure is hard to obtain only by die forging [27].…”

Section: Introductionmentioning

confidence: 99%

A novel annealing method to uniformly refine deformed mixed grain microstructure of a solution-treated Ni-based superalloy

Wang

Chen

Lin

et al. 2021

Sci. China Technol. Sci.

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Increasing static recrystallization (SRX) nucleation rate and decreasing grain growth rate are the main ways to obtain uniform and fine grain microstructure by annealing treatment. However, it is contradictory to raise the SRX nucleation rate and reduce grain growth rate during isothermal annealing treatment. This is because the increase of the SRX nucleation rate needs to raise annealing temperature, while the decline of grain growth rate needs to reduce the annealing temperature. To solve the contradiction, a novel method named cooling recrystallization annealing treatment (CRT) is designed and verified. For the CRT, the relatively high annealing temperature in the primary stage can promote SRX nucleation, and the gradually decreased annealing temperature can reduce the growth rate of SRX grains. Besides, an aged treatment is first carried out to precipitate high content of the δ phase before the CRT. Enough δ phases not only provide large numbers of sites for SRX nucleation but also limit the grain growth due to the pinning effect, especially in the primary high-temperature stage. The results show that the novel method can refine deformed mixed grain microstructure well when the suitable cooling rate, start and final recrystallization annealing temperatures are employed. The deformed mixed grain can be uniformly refined to an average size of 8.26 µm with the route of 900°C×12 h+1020°C→970°C×20 min.

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“…The being observed change of orientation maybe incurred when passing through the boundary of the grain initiated crack before entering another differently orientated grain. From the theory of fatigue crack formation [236,237], the crack is deemed formed after passing by one or two grains and then it may propagate intergranularly in a cleavage manner into small crack regime. Following is the zig-zag pattern where the crack is believed experiencing some resistance from microstructural level which could be the micro-scale features such as grain boundaries, inclusions, etc.…”

Section: Comparison With Conventionally Manufactured Eh36 Steelmentioning

confidence: 99%

Investigation of microstructure and mechanical properties of A131 EH36 steel additively manufactured by selective laser melting and direct laser deposition

Wang¹

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Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650 °C

Cited by 61 publications

References 26 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

A novel annealing method to uniformly refine deformed mixed grain microstructure of a solution-treated Ni-based superalloy

Investigation of microstructure and mechanical properties of A131 EH36 steel additively manufactured by selective laser melting and direct laser deposition

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