Inter- and intragranular stresses in cyclically-deformed 316 stainless steel

Wang, X.-L.; Wang, Y.D.; Stoica, A. D.; Horton, Derek J.; Tian, Hongli; Liaw, Peter K.; Choo, Hahn; Richardson, James W.; Maxey, Evan

doi:10.1016/j.msea.2005.02.030

Cited by 45 publications

(25 citation statements)

References 16 publications

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“…Such measurements probe the mean grain averaged stresses but the EBSD measurements in Figure 7 show that the intragranular residual stresses also decrease over the first 2000 cycles. Wang et al [17,52] used post-mortem neutron diffraction on 316LN stainless steel cycled under load control to show the average residual stresses in the (002) grain family decrease beyond ~5000 cycles to failure at ~8000 cycles, over which period peak breadth measurements implied dislocation densities of 1.4-2.2 x10 m -2…”

Section: Discussionmentioning

confidence: 99%

Evolution of intragranular stresses and dislocation densities during cyclic deformation of polycrystalline copper

2015

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We have used the cross-correlation based high resolution electron backscattering diffraction (HR-EBSD) technique to evaluate at high spatial resolution the spatial patterning of the type III intragranular residual stresses and geometrically necessary dislocation (GND) density within polycrystalline Cu after cyclic deformation. Oxygen free high conductivity (OFHC) polycrystalline copper samples were cyclically deformed under stress-control at a load ratio of 0.1 and EBSD measurements were made at points throughout the early stages of fatigue when strain amplitudes and cyclic creep rates are changing most significantly, namely at 0 cycles, 2 cycles, 200 cycles and 2000 cycles. Statistical analysis is presented showing that moderate correlations exist between stored GND density, residual intragranular stress and distance from the nearest grain boundaries or/and triple junctions. Ref: Ms.No.A-15-232Manuscript: "Evolution of intragranular stresses and dislocation densities during cyclic deformation of polycrystalline copper" Dear Prof MahajanWe are very pleased to submit our revised manuscript to Acta Materialia for considering publication. Each of referee's comment and suggestion has been carefully addressed. Detailed explanations are included in the 'Response to Reviewer' file. All changes and corrections to our original manuscript have been highlighted in the revised manuscript.We would be very grateful for Editor's effort and time to process our manuscript and very look forward to hearing from you soon. Authors are very grateful to Reviewer's time, effort and constructive comments. In order to comprehensively revise our manuscript and give most appropriate response, we address Reviewer's comments one by one in detail in the following section. (Reviewer's comments are marked using red colour, correction to the manuscript are marked as yellow and Authors responses are marked as blue.Editor's/Reviewer's comments: This paper gives some interesting insights into dislocation and stress development during cyclic testing. Overall the analysis is appropriate, although I was surprised about two things: the correlations reported in the paper are pretty low; I was surprised that the authors did not pursue this a little further to factor out some of the issues (such as substructure development) that appear to play an important role in causing this. Relating to the previous point, the authors mention dislocation substructure development in an extremely cursory and handwaving fashion. They mention correlations with orientation and different types of structure, but in an almost off-handed way that does not even connect with the wealth of literature on the subject. Issue 2. should certainly be fixed, and it would be nice to improve issue 1. a little if possible. I have made comments on the manuscript that I hope will be helpful (including pointing out a few typos).1. These coefficients are low. The correlation coefficients are generally not very high (~-0.2) (That's a bit of a stretch) This is a sensible suggestion and ...

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Section: Discussionmentioning

confidence: 99%

Evolution of intragranular stresses and dislocation densities during cyclic deformation of polycrystalline copper

2015

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“…[17][18][19] Evolution of the lattice strain during deformation of the current HEA is shown in Fig. 2(a), which illustrates that the lattice strain change is strongly dependent on the grain orientations, indicative of strong elastic anisotropy.…”

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confidence: 96%

“…For heavily deformed materials, it is also recognized that subgrain structure inhomogeneity mainly results from the selfassembly of dislocations rather than the intergranular strain variations and consequently produces the strain fluctuations responsible for peak broadening. 19 The experimentally determined peak broadening data, b 2 int , as a function of C hkl was shown in Fig. 4(a).…”

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In-situ neutron diffraction study of deformation behavior of a multi-component high-entropy alloy

Liu

Wang

et al. 2014

Applied Physics Letters

132

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Effect of microstructure anisotropy on the deformation of MAX polycrystals studied by in-situ compression combined with neutron diffraction Deformation behavior of a high-entropy alloy (HEA) was investigated by in situ tensile deformation with neutron diffraction. It was found that the face-centered cubic (FCC) HEA alloy showed strong crystal elastic and plastic anisotropy, and the evolution of its lattice strains and textures were similar to those observed in conventional FCC metals and alloys. Our results demonstrated that, in spite of chemical complexity, the multi-component HEA behaved like a simple FCC metal and the deformation was caused by the motion of mixed dislocations. V C 2014 AIP Publishing LLC. [http://dx.

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“…High-energy x-ray diffraction-based experiments employing in-situ mechanical loading that isolate the mechanical response of subsets of crystals within the deforming aggregate can provide insight into the stress state at the crystal length scale [1][2][3][4][5][6][7][8]. Variation of the stress state (magnitude and direction) from one crystal orientation to the next is a key finding from these experiments [8,9].…”

Section: Introductionmentioning

confidence: 98%

Quantifying the uncertainty of synchrotron-based lattice strain measurements

Schuren

Miller

2011

The Journal of Strain Analysis for Engineering Design

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Crystallographic lattice strains -measured using diffraction techniques -are the same magnitude as typical macroscopic elastic strains. From a research perspective, the main interest is in measuring changes in lattice strains induced during in-situ loading: either from one macroscopic stress level to another or from one cycle to the next. The hope is to link these measurements to deformation-induced changes in the internal structure of crystals, possibly related to inelastic deformation and damage. These measurements are relatively new -little experimental intuition exists and it is difficult to discern whether observed differences are due to actual micromechanical evolution or to random experimental fluctuations. If the measurements are linked to material evolution on the size scale of the individual crystal, they have the potential to change the ideas about grain scale deformation partitioning processes and can be used to validate crystal-based simulation frameworks. Therefore, understanding the uncertainty associated with the lattice strain experiments is a crucial step in their continued development. If the measured lattice strains are of the same order as the random fluctuations that are part of the measurement process, documenting the strains can create more confusion than understanding. Often lattice strain error is quoted as 61 3 10 24 . This simple value fails to account for the range of factors that contribute to the experimental uncertainty -which, if not properly accounted for, may lead to a false confidence in the measurements. The focus of this paper is the development of a lattice strain uncertainty expression that delineates the contributing factors into terms that vary independently: (i) the contribution from the instrument and (ii) the contribution from the material under investigation. These aspects of uncertainty are described, and it is then possible to employ a calibrant powder method (diffraction from an unstrained material with high-precision lattice constants) to quantify the instrument portion of the lattice strain uncertainty. In these experiments, the instrument contribution to the uncertainty has been found to be a function of the Bragg angle and the intensity of the diffracted peaks. To develop a model for the instrument portion of the lattice strain uncertainty two datasets obtained using a MAR345 online image plate at the Cornell High Energy Synchrotron Source and a GE 41RT amorphous silicon detector at the Advanced Photon Source have been examined.

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Inter- and intragranular stresses in cyclically-deformed 316 stainless steel

Cited by 45 publications

References 16 publications

Evolution of intragranular stresses and dislocation densities during cyclic deformation of polycrystalline copper

Evolution of intragranular stresses and dislocation densities during cyclic deformation of polycrystalline copper

In-situ neutron diffraction study of deformation behavior of a multi-component high-entropy alloy

Quantifying the uncertainty of synchrotron-based lattice strain measurements

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