Numerical Investigation into the Influence of Grain Orientation Distribution on the Local and Global Elastic-Plastic Behaviour of Polycrystalline Nickel-Based Superalloy INC-738 LC

Engel, Benedikt; Huth, Mark; Hyde, Christopher

doi:10.3390/cryst12010100

Cited by 5 publications

(4 citation statements)

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“…Numerous investigations of the deformation characteristics of nickel-based superalloys, exploring a range of parameters and observing phenomena across macro-, micro-, and nanoscales [6,[8][9][10][11][12], revealed a correlation between the strain and the formation of slip bands or twins, consistently associated with local plastic deformation under static or cyclic loading. In other studies [6,8], the influence of the local grain orientation on the crack initiation behaviour of the coarse-grained nickel-based superalloy René80 was investigated with a focus on the maximum Schmid factors under consideration of the most favourable slip system that favoured fatigue failure.…”

Section: Introductionmentioning

confidence: 99%

“…In other studies [6,8], the influence of the local grain orientation on the crack initiation behaviour of the coarse-grained nickel-based superalloy René80 was investigated with a focus on the maximum Schmid factors under consideration of the most favourable slip system that favoured fatigue failure. Additionally, FE models were developed to simulate material reactions on mechanical loadings based on artificial samples including elastic [9] and elastic-plastic [11] properties, both showing failure in areas with largely different properties.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to conventional deterministic approaches, which often involve high safety factors in component design, researchers previously constructed a model based on experimental data and FEM simulations using artificial samples to develop a probabilistic model for lifetime prediction [6,10,11]. These investigations took into account the local Young's moduli and Schmid factors concerning the phenomena outlined above.…”

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confidence: 99%

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Fatigue Analysis of the Nickel-Based Superalloy Inconel 617 by Fatigue Experiments and EBSD Data-Based Finite Element Simulations in Correlation with E·m Theories

Liesegang,

Beck

2024

Crystals

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Nickel-based superalloys exhibit pronounced elastic anisotropy and, hence, the local grain orientation strongly affects the stress and strain distribution in the material under mechanical loadings. Therefore, the crack initiation and failure behaviour of components made from nickel-based superalloys are complex and hardly predictable. A better fundamental understanding of the phenomena that occur in nickel-based superalloys under a quasistatic and cyclic load is therefore desired. Previously, a continuum mechanics-based model has been successfully developed, considering the grain structure, the elastic anisotropy, and the Schmid factor, based on data from electron backscatter diffraction (EBSD). The E·m model was confirmed by the finite element method (FEM) simulations and experimental observations regarding the resulting average stresses and strains in the individual grains as well as the formation of slip bands under a quasistatic load with few restrictions. The behaviour under cyclic loadings has been investigated in this work to correlate the mechanical behaviour, simulated by the previously developed FE models, with the local stiffness and Schmid factors considering fatigue failure. For this purpose, the fatigue behaviour of Inconel 617 samples was characterised up to the high-cycle fatigue (HCF) regime, accompanied by EBSD measurements for stress amplitudes that resulted in strains close to the elastic–plastic regime. The EBSD data were used to create digital twins of the samples to simulate the mechanical reaction to a displacement similar to the associated strain of the fatigue tests. An analysis of the fractured samples by scanning electron microscopy was performed to retrace the location of the crack initiation supported by the EBSD measurements before and after fatigue testing. Two samples were investigated in detail that showed different fracture types. Sample 1 showed transcrystalline failure in a grain that showed a high Young’s modulus, Schmid factor, and resolved shear stress that indicates a failure due to the properties of the grain itself. In contrast, an intercrystalline failure was observed for sample 2 that showed large differences in the orientation and, hence, largely different mechanical properties in the area of failure as well. The observed failure types, the resulting stresses and strains calculated by the FE model, and the consideration of the E·m model showed an agreement of all the methods. Therefore, the findings of this work complement previous investigations of the mechanical behaviour of coarse-grained anisotropic nickel-based superalloys with a focus on the orientations of the grains towards the loading direction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Fatigue Analysis of the Nickel-Based Superalloy Inconel 617 by Fatigue Experiments and EBSD Data-Based Finite Element Simulations in Correlation with E·m Theories

Liesegang,

Beck

2024

Crystals

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“…Steels and iron-based alloys [2-9]; • Non-ferrous alloys with fcc-(Ni- [10,11] and Cu-based [12][13][14]), or hcp crystal structure (Mg- [15,16] and Ti-based [17,18]). Other examples include Zirconium [19], Bi-Sn alloy [20] or polycarbonate resins [21]; • Multicomponent and high-entropy alloys [22][23][24]; • General theoretical studies on crystal plasticity [25][26][27].…”

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confidence: 99%

Crystal Plasticity (Volume II)

Polkowski

2022

Crystals

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Investigation of the tensile deformation behaviour in Ni-based superalloy inconel alloy 617 using EBSD-based finite element simulations and optical flow method

Liesegang¹,

Lion²,

Beck³

et al. 2023

J Mater Sci

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To improve component design, the fundamental understanding of the fatigue behaviour of gas turbine materials is essential. Since Ni-alloys exhibit pronounced elastic anisotropy, the local grain orientation strongly affects the stress and strain distribution in the material under mechanical loadings. This work addresses the characterisation of anisotropic elastic–plastic deformation and its consequences for crack initiation of nickel-base superalloy IN617 under tensile loading. Samples were loaded in situ in a scanning electron microscope (SEM) to correlate the deformation behaviour with the grain structure and the grain orientation determined by electron backscatter diffraction (EBSD) measurements. To calculate the resulting stresses and strains, the EBSD data were used to develop a model by finite element method (FEM) considering the grain structure and orientation. The results of the elastic–plastic finite element (FE) simulation were compared with the theories of the E⋅m model based on the Schmidt factor (m) and anisotropic Young’s modulus (E). A mathematical image registration method called “optical flow method” (OFM), which is capable to calculate the transformation of EBSD measuring points during deformation, was applied to the EBSD data. The strains calculated by the optical flow method and by FE simulation were compared for two samples. The findings revealed large strains in the later crack initiation area found in both the OFM and FEM. The developed FEM model was verified by the successful correlation of hypotheses of the E·m model with the simulated mechanical behaviour. Furthermore, the impact of the microstructural neighbourhood on the mechanical behaviour was emphasised. Graphical Abstract

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Numerical Investigation into the Influence of Grain Orientation Distribution on the Local and Global Elastic-Plastic Behaviour of Polycrystalline Nickel-Based Superalloy INC-738 LC

Cited by 5 publications

References 17 publications

Fatigue Analysis of the Nickel-Based Superalloy Inconel 617 by Fatigue Experiments and EBSD Data-Based Finite Element Simulations in Correlation with E·m Theories

Fatigue Analysis of the Nickel-Based Superalloy Inconel 617 by Fatigue Experiments and EBSD Data-Based Finite Element Simulations in Correlation with E·m Theories

Crystal Plasticity (Volume II)

Investigation of the tensile deformation behaviour in Ni-based superalloy inconel alloy 617 using EBSD-based finite element simulations and optical flow method

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