Crystal orientation changes: A comparison between a crystal plasticity finite element study and experimental results

Rehrl, Christian; Völker, Bernhard; Kleber, Siegfried; Antretter, Thomas; Pippan, Reinhard

doi:10.1016/j.actamat.2011.12.052

Cited by 31 publications

(18 citation statements)

References 33 publications

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“…Deformation behavior of single crystal specimen strongly depends on its orientation relative to the load axis [51,52]. At the same time, even bi-crystal specimens will demonstrate more complex behavior than will single crystal specimens [53]. Moreover, radiation-induced effects cause some deformation stages in a single crystal specimen to disappear [54].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 98%

Analysis of structure and deformation behavior of AISI 316L tensile specimens from the second operational target module at the Spallation Neutron Source

Gussev

McClintock

Garner³

2016

Journal of Nuclear Materials

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Please cite this article as: M.N. Gussev, D.A. McClintock, F.A. Garner, Analysis of structure and deformation behavior of AISI 316L tensile specimens from the second operational target module at the AbstractIn an earlier publication, tensile testing was performed on specimens removed from the first two operational targets of the Spallation Neutron Source (SNS). There were several anomalous features in the results. First, some specimens had very large elongations (up to 57%) while others had significantly smaller values (10-30%). Second, there was a larger than the usual amount of data scatter in the elongation results. Third, the stress-strain diagrams of nominally similar specimens spanned a wide range of behavior ranging from expected irradiation-induced hardening to varying levels of force drop after yield point and indirect signs of "traveling deformation wave" behavior associated with strain-induced martensite formation. To investigate the cause(s) of such variable tensile behavior, several specimens from Target 2, spanning the range of observed tensile behavior, were chosen for detailed microstructural examination using electron backscatter diffraction (EBSD) analysis. It was shown that the steel employed in the construction of the target contained an unexpected bimodal grain size distribution, containing very large out-of-specification grains surrounded by "necklaces" of grains of within-specification sizes. The large grains were frequently comparable to the width of the gauge section of the tensile specimen. The propensity to form martensite during deformation was shown to be accelerated by radiation but also to be very sensitive to the relative orientation of the grains with respect to the tensile axis. Specimens having large grains in the gauge that were most favorably oriented for production of martensite strongly exhibited the traveling deformation wave phenomenon, while those specimens with less favorably oriented grains had lesser or no degree of the wave effect, thereby accounting for the observed data scatter.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 98%

Analysis of structure and deformation behavior of AISI 316L tensile specimens from the second operational target module at the Spallation Neutron Source

Gussev

McClintock

Garner³

2016

Journal of Nuclear Materials

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“…Rehrl et al (86) started with a coarse-grained austenitic stainless steel to obtain a bicrystalline tensile sample with a cross section of 1 3 1 mm. They characterized both the strain and the orientation development at a strain of 28% and performed CP FE simulations using Abaqus and a strain hardening model found in Bassani & Wu (87,88).…”

Section: Tensile Testsmentioning

confidence: 99%

Polycrystal Plasticity: Comparison Between Grain - Scale Observations of Deformation and Simulations

Pokharel

Lind²,

Kanjarla³

et al. 2014

Annu. Rev. Condens. Matter Phys.

144

104

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The response of polycrystals to plastic deformation is studied at the level of variations within individual grains, and comparisons are made to theoretical calculations using crystal plasticity (CP). We provide a brief overview of CP and a review of the literature, which is dominated by surface observations. The motivating question asks how well CP represents the mesoscale behavior of large populations of dislocations (as carriers of plastic strain). The literature shows consistently that only moderate agreement is found between experiment and calculation. We supplement this with a current example of microstructure evolution in the interior of a copper sample subjected to tensile deformation. Nondestructive measurements of orientation fields were performed using the near-field highenergy X-ray diffraction microscopy (nf-HEDM) technique at the Advanced Photon Source (APS). Starting at highly ordered grains, a single two-dimensional slice of microstructure containing ∼150 grains was followed through multiple strain states, where it tracked lattice rotations and defect accumulation of up to 14% elongation. In accord with the literature, at the scale of individual grains, comparison of observations with CP models indicates reasonable qualitative agreement but significant variations between simulation and experiment are apparent. The conclusion is that in order to be able to quantify the effects of microstructure on the distributions of slip, orientation change, and damage accumulation, the empirically derived constitutive relations used in continuumscale simulations need to be improved. Equally important will be the development of large-scale simulations of polycrystals that directly model dislocations. 317Annu. Rev. Condens. Matter Phys. 2014.5:317-346. Downloaded from www.annualreviews.org by University of Texas -San Antonio on 08/26/14. For personal use only.

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“…On the other hand, the experimental and finite element numerical research was conducted on SR and ASR, and the available literature emphasized thick and thin sheets, but no studies were carried out on metal foils [12][13][14][15][16]. Crystal plasticity (CP) constitutive models, which were developed based on dislocation evolution in crystals, are widely developed to investigate the plastic deformation behavior of the single crystal and polycrystalline experimentally and theoretically [17][18][19][20][21][22][23]. Zhang et al [17] presented a controlled Poisson Voronoi tessellation for grain and cohesive boundary generation applied to crystal plasticity analysis.…”

Section: Introductionmentioning

confidence: 99%

Symmetric and Asymmetric Rolling Pure Copper Foil: Crystal Plasticity Finite Element Simulation and Experiments

Chen

Liu

2015

Acta Metall. Sin. (Engl. Lett.)

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A systematic study has been conducted aiming to attain an insight into the influence of coefficient of roll speed asymmetry, crystal orientation and structure on the deformation behavior, and crystallographic orientation development during foil rolling. Simulations were successfully carried out by using crystal plasticity finite element method (CPFEM), and a novel computational framework is presented for the representation of virtual polycrystalline grain structures. It has been found that asymmetric rolling (ASR) is more efficient in producing plastic deformation since it develops additional shear strain and activity of slip system compared with symmetric rolling (SR). For ASR, increase in the length of the shear zone, and decrease in the amount of the pressure and roll force would lead to further reduction. The shear strain path in SR and ASR is strictly influenced by the misorientation of neighbor grains, and corresponding {1 1 1} pole figures offer direct evidence of the spread of crystallographic orientation around the normal direction. The activity of slip systems was examined in detail and found that the predicted results are consistent with the surface layer model. The accuracy of the developed CPFEM model is verified by the fact that the simulated results of roll force coincide well with the experimental results.

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Crystal orientation changes: A comparison between a crystal plasticity finite element study and experimental results

Cited by 31 publications

References 33 publications

Analysis of structure and deformation behavior of AISI 316L tensile specimens from the second operational target module at the Spallation Neutron Source

Analysis of structure and deformation behavior of AISI 316L tensile specimens from the second operational target module at the Spallation Neutron Source

Polycrystal Plasticity: Comparison Between Grain - Scale Observations of Deformation and Simulations

Symmetric and Asymmetric Rolling Pure Copper Foil: Crystal Plasticity Finite Element Simulation and Experiments

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