Grain boundary properties of a nickel-based superalloy: Characterisation and modelling

Alabort, Enrique; Barba, Daniel; Sulzer, Sabin; Lißner, Maria; Petrinic, Nikica; Reed, Roger C.

doi:10.1016/j.actamat.2018.03.059

Cited by 50 publications

(14 citation statements)

References 43 publications

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“…[18][19][20][21][22][23] The study up to date on STAL-15 again revealed similar trend-with both extensive experiments and modeling efforts. [24][25][26] In addition, for alloys with low or no c 0 phase, creep life and ductility are significantly enhanced. [7,27,28] In summary, grain boundary serration has been demonstrated to improve mechanical properties such as creep, low cycle fatigue (LCF), and dwell fatigue remarkably in various superalloys.…”

Section: Serration Of Grain Boundaries In Metals Andmentioning

confidence: 99%

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Tang

Wilkinson

Reed

2018

Metall Mater Trans A

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Grain boundary serration in the superalloy Inconel 600 was studied. Two microstructural variants, one with nonserrated and the other with serrated grain boundaries were generated by altering the heat-treatment conditions, while keeping other aspects of the microstructure unchanged. The effect on the creep response between 700°C and 900°C was measured, and the different failure modes and accumulated damage were quantified using high-angular resolution electron backscatter diffraction analysis in the scanning electron microscope and also by X-ray computed tomography. It is found that serration plays a more crucial role in the high-temperature/low-stress regime when an intergranular cracking mechanism involving cavitation is operative; here it plays a role in improving both creep life and creep ductility. Any effect of serration is less prevalent at low temperatures where transgranular failure is dominant.

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Section: Serration Of Grain Boundaries In Metals Andmentioning

confidence: 99%

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Tang

Wilkinson

Reed

2018

Metall Mater Trans A

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“…These differences in GBs as a function of orientation are likely to play a dominant role on the nucleation of damage by GB cracking during monotonic and cyclic deformation or in aggressive environments (McMurtrey et al, 2015;Liang et al, 2021) as well as on the development of GB sliding during creep deformation (Wei and Anand, 2004). It is obvious that the combination of the crystal plasticity model presented in this paper together with cohesive elements at the GBs (Alabort et al, 2018) would provide a novel way to explore the role of opaque, translucent and transparent GBs on the ductility, formability and forming limits of polycrystalline materials.…”

Section: Comparison With Experimentsmentioning

confidence: 91%

On the effect of slip transfer at grain boundaries on the strength of FCC polycrystals

Nieto-Valeiras,

Haouala,

LLorca

2021

Preprint

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The effect of slip transfer on the flow strength of various FCC polycrystals was analyzed by means of computational homogenization of a representative volume element of the microstructure. The crystal behavior was governed by a physically-based crystal plasticity model in the framework of finite strains where slip transfer at grain boundaries was allowed between slip systems suitably oriented according to geometrical criteria. Conversely, slip transfer was blocked if the conditions for slip transfer were not fulfilled, leading to the formation of dislocation pile-ups. All the model parameters for each material were identified from either dislocation dynamics simulations or experimental data from the literature. Slip transfer led to a reduction in the flow stress of the polycrystals (as compared with the simulations with opaque grain boundaries) which was dependent on the fraction of translucent and transparent grain boundaries in the microstructure. Moreover, dislocation densities and Von Mises stresses were much higher around opaque grain boundaries, which become suitable places for damage nucleation. Finally, predictions of the Hall-Petch effect in Al, Ni, Cu and Ag polycrystals including slip transfer were in better agreement with the literature results, as compared with predictions assuming that all grain boundaries are opaque, particularly for small grain sizes (< 20 µm).

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“…where e g is the strain contributed by intragranular deformation or dislocation slip, e gbs is due to grain boundary sliding, and e diff is induced by the diffusion through the [14,15]. In addition, it is worthwhile to note that the grain rotation occurs during the intragranular deformation [29][30][31]. The deformation compatibility among grains is one of the most important factors during the intragranular deformation.…”

Section: Creep Properties At 760°c and 645 Mpamentioning

confidence: 99%

Effect of Aging Heat Treatment on the Microstructure and Creep Properties of the Cast Ni-Based Superalloy at Low Temperature

Wang

Liu

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Effect of aging heat treatment on the grain boundary microstructure and creep properties of a cast Ni-based superalloy was investigated. With increasing aging temperature from 750 to 1000°C, M 23 C 6 carbides along the grain boundaries evolve from fine distributed block, continuous film into the coarse discrete block. Moreover, the M 23 C 6 carbides are mainly enveloped within c 0 layers along grain boundaries during 1000°C aging. Creep rupture lifetime and elongation at 760°C and 645 MPa are improved with increasing the aging temperature. In particular, the creep rupture lifetime of the specimens aging at 1000°C is one order of magnitude higher than that of the specimens aging at 750°C. The enhancement of ductility induced by the c 0 envelopes plays a significant role in the improvement of creep rupture lifetime.

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Grain boundary properties of a nickel-based superalloy: Characterisation and modelling

Cited by 50 publications

References 43 publications

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

On the effect of slip transfer at grain boundaries on the strength of FCC polycrystals

Effect of Aging Heat Treatment on the Microstructure and Creep Properties of the Cast Ni-Based Superalloy at Low Temperature

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