Plastic behavior of a nickel-based alloy under monotonic-tension and low-cycle-fatigue loading

Huang, E-Wen; Barabash, Rozaliya; Wang, Yandong; Clausen, B.; Li, Li; Liaw, Peter K.; Ice, Gene E.; Ren, Yang; Choo, Hahn; Pike, Lee M.; Klarstrom, D. L.

doi:10.1016/j.ijplas.2007.10.001

Cited by 60 publications

(31 citation statements)

References 30 publications

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“…The observed HR-EBSD measured dislocation evolution trend agrees well with Huang et al's [19] neutron diffraction study in which in-situ neutron diffraction was carried out on Nickel superalloy subjected to LCF at room temperature. However, in their study, only grain-averaged dislocation density could be estimated from measuring the peak profile variation (peak position and bordering) and the dislocation structure established within grains was not accessible.…”

Section: Discussionsupporting

confidence: 87%

“…These modelling efforts have focused at a range of length and timescales, using approaches such as molecular dynamic simulations [8,9] up to the grain level using crystal plasticity finite element techniques [10][11][12][13][14][15]. This range of approaches necessitates ever increasing fidelity of experimental studies that span length and timescales, such as X-ray synchrotron [16] [17,18] and high energy neutron diffraction [19]; as well as electron microscopy [20,21] microstructurally-sensitive and physically based modelling approaches necessitate local measurements of defect content and residual stresses to improve the prediction of fatigue crack nucleation and short crack growth.…”

Section: Introductionmentioning

confidence: 99%

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On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction

et al. 2015

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This is an authors' copy of a manuscript published in Acta Materialia Volume 97, 15 September 2015, Pages 367-379. http://dx.doi.org/10.1016/j.actamat.2015.06.035 AbstractA series of interrupted three-point bend low-cycle fatigue tests were carried out on a powder metallurgy FHG96 nickel superalloy sample containing non-metallic inclusions. High resolution electron backscatter diffraction (HR-EBSD) was used to characterize the distribution and evolution of geometrically necessary dislocation (GND) density, residual stress and total dislocation density near a non-metallic inclusion. A systematic study of room temperature cyclic deformation is presented in which slip localisation, cyclic hardening, ratcheting and stabilisation occur, through to crack formation and microstructurally-sensitive propagation. Particular focus is brought to bear at the inclusion-matrix interface. Complex inhomogeneous deformation structures were directly observed from the first few loading cycles, and these structures were found not to vary significantly with increasing number of cycles. A clear link was observed between crack nucleation site and microstructurally-sensitive growth path and the spatially-resolved sites of extreme values of residual stress and GND density.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction

et al. 2015

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“…12b and c. During unloading stage (the applied stress is reduced), the dislocation loop would shrink back due to the decrease of dislocation line tension. In addition, the mutual annihilation of dislocations can take place during unloading (Huang et al 2008). Both the shrinkage and annihilation of dislocations resulted in reduced dislocation density (see the dips in Fig.…”

Section: Cyclic Responsementioning

confidence: 99%

Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics

Lin

Huang

Farukh

et al. 2016

Mech Adv Mater Mod Process

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Background: Nickel-based superalloys are usually exposed to high static or cyclic loads in non-ambient environment, so a reliable prediction of their mechanical properties, especially plastic deformation, at elevated temperature is essential for improved damage-tolerance assessment of components. Methods: In this paper, plastic deformation in a single-crystal nickel-based superalloy CMSX4 at elevated temperature was modelled using discrete dislocation dynamics (DDD). The DDD approach was implemented using a representative volume element with explicitly-introduced precipitate and periodic boundary condition. The DDD model was calibrated using stress-strain response predicted by a crystal plasticity model, validated against tensile and cyclic tests at 850°C for <001 > and <111 > crystallographic orientations, at a strain rate of 1/s. Results: The DDD model was capable to capture the global stress-strain response of the material under both monotonic and cyclic loading conditions. Considerably higher dislocation density was obtained for the <111 > orientation, indicating more plastic deformation and much lower flow stress in the material, when compared to that for <001 > orientation. Dislocation lines looped around the precipitate, and most dislocations were deposited on the surface of precipitate, forming a network of dislocation lines. Simple unloading resulted in a reduction of dislocation density. Conclusions: Plastic deformation in metallic materials is closely related to dynamics of dislocations, and the DDD approach can provide a more fundamental understanding of crystal plasticity and the evolution of heterogeneous dislocation networks, which is useful when considering such issues as the onset of damage in the material during plastic deformation.

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“…When the applied stress is reduced (the unloading stage), the dislocation loop tends to shrink due to the reduction of dislocation line tension and some of the deposited segments would disappear if not hindered [33]. Moreover, the mutual dislocation annihilation can happen during the reversed loading stage [34]. Therefore, a reduction of dislocation density, as shown in Figures 5 and 6, is a direct outcome of the annihilation and shrinkage of dislocations.…”

Section: Evolution Of Dislocation Networkmentioning

confidence: 98%

3D DDD modelling of dislocation–precipitate interaction in a nickel-based single crystal superalloy under cyclic deformation

Lin

Huang

Zhao

et al. 2018

Philosophical Magazine

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Plastic behavior of a nickel-based alloy under monotonic-tension and low-cycle-fatigue loading

Cited by 60 publications

References 30 publications

On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction

On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction

Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics

3D DDD modelling of dislocation–precipitate interaction in a nickel-based single crystal superalloy under cyclic deformation

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