Microstructural characterisation and constitutive behaviour of alloy RR1000 under fatigue and creep–fatigue loading conditions

Stöcker, Christian; Zimmermann, Martina; Christ, H.‐J.; Zhan, Zhi Lan; Cornet, C.; Li, Zhao; Hardy, Mark; Tong, Jie

doi:10.1016/j.msea.2009.04.055

Cited by 27 publications

(19 citation statements)

References 32 publications

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“…As shown in Fig.2a (from Stöcker et al [45]), polycrystalline alloy RR1000 has a fine grain structure with an average grain size of 4.76µm and random crystallographic orientation. To study the mechanical deformation at the grain level, a plane-strain representative volume element (RVE) is used to represent the global material behaviour, which was constructed using the Voronoi tessellation technique [46].…”

Section: Rve Modelmentioning

confidence: 99%

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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Crystal plasticity has been applied to model the cyclic constitutive behaviour of a polycrystalline nickel-based superalloy at elevated temperature using finite element analyses.A representative volume element, consisting of randomly oriented grains, was considered for the finite element analyses under periodic boundary constraints. Strain-controlled cyclic test data at 650°C were used to determine the model parameters from a fitting process, where three loading rates were considered. Model simulations are in good agreement with the experimental results for stress-strain loops, cyclic hardening behaviour and stress relaxation behaviour. Stress and strain distributions within the representative volume element are of heterogeneous nature due to the orientation mismatch between neighboring grains. Stress concentrations tend to occur within "hard" grains while strain concentrations tend to locate within "soft" grains, depending on the orientation of grains with respect to the loading direction. The model was further applied to study the near-tip deformation of a transgranular crack in a compact tension specimen using a submodelling technique. Grain microstructure is shown to have an influence on the von Mises stress distribution near the crack tip, and the gain texture heterogeneity disturbs the well-known butterfly shape obtained from the viscoplasticity analysis at continuum level. The stress-strain response near the crack tip, as well as the accumulated shear deformation along slip system, is influenced by the orientation of the grain at the crack tip, which might dictate the subsequent crack growth through grains.Individual slip systems near the crack tip tend to have different amounts of accumulated shear deformation, which was utilised as a criterion to predict the crack growth path.

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Section: Rve Modelmentioning

confidence: 99%

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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“…Polycrystalline alloy RR1000 may be viewed as an aggregation of single crystal grains with random orientations, as shown in Fig.1a (from [21]), where the color designates crystallographic orientation. The material has a fine grain structure with an average size of 4.76µm.…”

Section: Finite Element Modelmentioning

confidence: 99%

Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature

Lin

Tong

et al. 2010

Materials Science and Engineering: A

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“…The material was produced through a powder metallurgy route and has a fine grain microstructure, with an average grain size of ~5µm [21]. Fatigue, creep and material constitutive behaviour of RR1000 at high temperatures have been extensively studied at Portsmouth [22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Oxygen diffusion and crack growth for a nickel-based superalloy under fatigue-oxidation conditions

Karabela

Lin

et al. 2013

Materials Science and Engineering: A

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Advanced microscopy characterisation and numerical modelling have been carried out to investigate oxygen diffusion and crack growth in a nickel-based superalloy under fatigue-oxidation conditions. Penetration of oxygen into the material and the associated internal oxidation, which leads to material embrittlement and failure, have been found from Focused Ion Beam (FIB) examinations. Applied fatigue loading tends to enhance the extent of internal oxidation for temperatures at 750°C and above. Using a submodelling technique, finite element analyses of oxygen penetration at grain level have been carried out to quantify the fatigue-oxidation damage and calibrate the diffusion parameters based on the measurements of maximum depth of internal oxidation. The grain microstructure was considered explicitly in the finite element model, where the grain boundary was taken as the primary path for oxygen diffusion. A sequentially coupled mechanical-diffusion analysis was adopted to account for the effects of deformation on diffusion during fatigue loading, for which the material constitutive behaviour was described by a crystal plasticity model at grain level. Prediction of oxidation-assisted crack growth has also been carried out at elevated temperature from the finite 2 element analyses of oxygen diffusion near a fatigue crack tip. A failure curve for crack growth has been constructed based on the consideration of both oxygen concentration and accumulated inelastic strain near the crack tip. The predictions from the fatigue-oxidation failure curve compared well with the experimental results for triangular and dwell loading waveforms, with significant improvement achieved over those predicted from the viscoplastic model alone.

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Microstructural characterisation and constitutive behaviour of alloy RR1000 under fatigue and creep–fatigue loading conditions

Cited by 27 publications

References 32 publications

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Crystal plasticity modeling of cyclic deformation for a polycrystalline nickel-based superalloy at high temperature

Oxygen diffusion and crack growth for a nickel-based superalloy under fatigue-oxidation conditions

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