Modeling the Role of Dislocation Substructure during Class M and Exponential Creep

Raj, S. V.; Iskovitz, Ilana; Freed, Alan D.

doi:10.1016/b978-012425970-6/50009-6

Cited by 14 publications

(6 citation statements)

References 143 publications

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“…This model was used by Raj and Pharr [1989] to describe flow of halite at relatively high stresses ( σ > 4.44 MPa). Note that at moderate temperatures (320–640°K) the activation energy for creep of sodium chloride is not strongly dependent on stress [ Raj et al , 1996].…”

Section: Discussionmentioning

confidence: 99%

Deformation by dissolution and plastic flow of a single crystal sodium chloride indenter: An experimental study under the confocal microscope

Karcz¹,

Aharonov²,

Ertaş³

et al. 2008

J. Geophys. Res.

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[1] A halite cone-shaped indenter loaded against a flat silicate surface and immersed in saturated solution deforms in two distinct stages. The first stage is characterized by slow convergence rates and rapid contact area reduction, while the second stage is characterized by high convergence rates and fluctuations around a constant contact area. This sequence shows a progression of the system from a far from equilibrium state, through an overshoot point to a dynamic steady state. We propose that the evolution of the system is dictated by an interaction between two deformation mechanisms. The first is undercutting dissolution that reduces the area of the contact, and the second is probably plastic flow that increases it. Undercutting dissolution is driven by a horizontal thermal gradient and gradients in strain and surface energy. The feedback between these two mechanisms is responsible for the establishment of a steady state at the latter part of the second deformation stage, and is at the core of the free face pressure solution model. On the basis of this data we model the relation between undercutting rates at grain contacts and rates of granular compaction.

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Section: Discussionmentioning

confidence: 99%

Deformation by dissolution and plastic flow of a single crystal sodium chloride indenter: An experimental study under the confocal microscope

Karcz¹,

Aharonov²,

Ertaş³

et al. 2008

J. Geophys. Res.

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“…In literature [ 28 ], the cell consists of a wide and diffused boundary containing dislocation tangle, while the sub-boundary is narrow, where the misorientation angle across the sub-boundary is larger than that across the cell wall. Accounting the bright field images, distinctive differences in crystal orientations are apparent, but the dense dislocations more influence the strain contrast at the grain interior for the higher magnitude of plastic strain in Figure 3 f.…”

Section: Resultsmentioning

confidence: 99%

Influence of Residual Stress around Constituent Particles on Recrystallization and Grain Growth in Al-Mn-Based Alloy during Annealing

Park

Muraishi

2021

Materials

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Effect of the residual stress on the recovery and recrystallization behaviors of the cold-rolled AA3003 aluminum alloy was investigated. The evolution of deformed microstructure and dislocation density characterized by TEM and Synchrotron X-ray measurements found that the change in the ratio between low angle grain boundaries (LAGBs) and high angle grain boundaries (HAGBs) during annealing is varied depending on the initial dislocation density, where the value of HAGB/LAGBs ratio is amounted to be about 0.8 at maximum. The nucleation and growth rate of the recrystallized grains are strongly dependent on the net driving pressure associated with dislocation density increased by the amount of reduction. EBSD analysis revealed that the deformed zone composed of the fine equi-axed grains with large misorientation angles would be formed in the vicinity of the constituent particles, which is consistent with the region of the large residual stress and total displacement predicted by Eshelby inhomogeneity problem under cold rolling condition.

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“…2 [37][38][39][40][41]. A number of studies have reported an inverse relationship between the subgrain/cell size and the applied stress [38,46,47]. The subgrain/cell size,  varies with the applied stress,  following the relationship:…”

Section: Creep Deformation Mechanism In Am 316l Ssmentioning

confidence: 99%

Location-Dependent Mechanical Property Evaluation on Additively Manufacture Materials

Chen

Zhang

et al. 2021

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This report summarizes research activities conducted at Argonne National Laboratory in support of the development, qualification and certification of additively manufactured (AM) metallic components to allow for innovative reactor design and licensing for the Transformational Challenge Reactor (TCR). Focus is on the evaluation of high temperature mechanical properties including creep and fatigue of 316L stainless steel manufactured by the laser powder bed fusion process. Creep behavior of AM 316L stainless steel was evaluated for rods printed by either or a combination of both lasers of the dual-laser system of a Concept Laser-M2 printer to examine the consistency across the build plate. Creep tests were conducted at temperatures of 550, 575, 600, and 650°C and stresses between 175 and 300 MPa using ASTM standard-sized specimens. The effect of heat treatments at different temperatures on creep properties of AM 316L SS was examined to understand the processing-microstructure-property relationship. Fatigue properties of AM 316L SS were investigated for two print geometries (rod and plate) and in two build orientations of printed plates. Locations of specimens in the build were carefully tracked such that the testing data can be directly related to location-specific in situ data to establish links between printing process, post-printing treatment, microstructure and mechanical properties. The work is to support the development of a digital platform informed approach to AM component qualification and certification for nuclear applications.

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Modeling the Role of Dislocation Substructure during Class M and Exponential Creep

Cited by 14 publications

References 143 publications

Deformation by dissolution and plastic flow of a single crystal sodium chloride indenter: An experimental study under the confocal microscope

Deformation by dissolution and plastic flow of a single crystal sodium chloride indenter: An experimental study under the confocal microscope

Influence of Residual Stress around Constituent Particles on Recrystallization and Grain Growth in Al-Mn-Based Alloy during Annealing

Location-Dependent Mechanical Property Evaluation on Additively Manufacture Materials

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