A quantitative approach to study the effect of local texture and heterogeneous plastic strain on the deformation micromechanism in RR1000 nickel-based superalloy

Birosca, S.; Gioacchino, Fabio Di; Stekovic, Svjetlana; Hardy, Mark

doi:10.1016/j.actamat.2014.04.039

Cited by 112 publications

(40 citation statements)

References 52 publications

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“…Birosca et al [19] utilised the Schmid factor, Taylor factor and GND density to address the effect of local texture on crack propagation path in Ni superalloy and found that secondary cracks are more prone to nucleate on triple junctions between soft and hard orientated grains, and the Taylor factor parameter was found not to give any direct indication of dislocation activity within a grain. Mesoscale modelling [20] with quantified Schmid factor in a polycrystal also concluded micro-crack initiation near defects is highly dependent on adjacent grain orientations.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the recognition of the importance of Schmid factors with respect to dislocation slip, some authors [19][20][21][22][23][24] have utilised these key microstructural quantities to understand local micromechanical behaviour for crack nucleation. Birosca et al [19] utilised the Schmid factor, Taylor factor and GND density to address the effect of local texture on crack propagation path in Ni superalloy and found that secondary cracks are more prone to nucleate on triple junctions between soft and hard orientated grains, and the Taylor factor parameter was found not to give any direct indication of dislocation activity within a grain.…”

Section: Introductionmentioning

confidence: 99%

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An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

et al. 2016

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High resolution EBSD studies on a deformed copper polycrystal have been carried out to quantify the microstructural residual stress distributions, and those of stress state including triaxiality of importance in defect nucleation studies. Crystal plasticity analysis of a representative, similarly textured, model polycrystal has been carried out showing that the experimental distributions of microstructural residual stress components, effective stress, hydrostatic stress and stress triaxiality are well captured.The crystal model enables point-wise microstructural Schmid factors to be calculated both globally (ie with respect to the macroscopic remote loading) and locally from full knowledge of the grain-level stress state. Significant differences are demonstrated such that global Schmid analysis tends to overestimate slip activity and the frequency of high Schmid factors, indicating that the local microstructural heterogeneity is significant and caution is necessary in interpreting polycrystal behaviour using global Schmid factors. A stored energy criterion for fatigue crack nucleation indicates that preferential sites for fatigue crack nucleation are local to grain boundaries (as opposed to triple junctions), and that hard-soft grain interfaces where high GND densities develop are preferable.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

et al. 2016

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“…While these studies provide quantitative analysis of stored GND density and associated structure, no crack formation process was directly observed and comparison of the samples was statistical in nature as different samples and sampled areas were used. Birosca et al [32] used Hough based EBSD approaches (which have ~100 less GND resolution) to quantitatively study GND density distributions near fatigue crack propagation paths in nickel superalloy subjected to thermomechanical fatigue. They found that local microstructural texture influences fatigue crack propagation and fatigue life.…”

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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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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“…This infers that the growth of new α-Fe 2 O 3 grains occurs in the vicinity of the grain boundaries in the Fe 3 O 4 grains. It is well known that in dual-phase steels a higher α-Fe fraction experiences local plastic deformation due to the martensitic phase transformation [47]. Similarly, the certain local plastic deformation in tertiary oxide scale could occur due to phase transformation among oxide phases.…”

Section: Discussionmentioning

confidence: 99%

Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD

Jiang

Zhao

et al. 2015

Surface and Coatings Technology

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Q. (2015). Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD. Surface and Coatings Technology, Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD AbstractThis work presents a fine microstructure and local misorientation study of various oxide phases in the tertiary oxide scale formed on a hot-rolled steel strip via electron back-scattering diffraction (EBSD). Local strain in individual grains of four phases, ferrite (α-Fe), wustite (FeO), magnetite (Fe 3 O 4 ) and hematite (α-Fe 2 O 3 ), has been systematically analysed. The results reveal that Fe 3 O 4 has a lower local strain than α-Fe 2 O 3 , in particular, on the surface and inner layers of the oxide scale. The multiphase oxides along the cracking or α-Fe 2 O 3 penetration generally develop a high local misorientation. Localised stain along the cracks demonstrates that the misorientation tends to be strong near grain boundaries. The high fraction of small Fe 3 O 4 grains accumulate at the oxide-substrate interface, which leads to a dramatic increase in the intensity of local stain. This variation is due mainly to the phase transformation among the oxide phases, i.e., the Fe 3 O 4 particles during their nucleation and growth. The combined action of stress relief and re-oxidisation is proposed to explain the formation of Fe 3 O 4 seam at the oxide-steel interface. The present study offers an intriguing insight into the deformation behaviour of the tertiary oxide scale formed on steels, and may help with understanding the stress-aided oxidation effect of metal alloys. offers an intriguing insight into the deformation behaviour of the tertiary oxide scale formed on steels, and may help with understanding the stress-aided oxidation effect of metal alloys.

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A quantitative approach to study the effect of local texture and heterogeneous plastic strain on the deformation micromechanism in RR1000 nickel-based superalloy

Cited by 112 publications

References 52 publications

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

An HR-EBSD and computational crystal plasticity investigation of microstructural stress distributions and fatigue hotspots in polycrystalline copper

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

Local strain analysis of the tertiary oxide scale formed on a hot-rolled steel strip via EBSD

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