In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel

Gussev, Maxim N.; Leonard, Keith J.

doi:10.1016/j.jnucmat.2019.01.034

Cited by 128 publications

(45 citation statements)

References 67 publications

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“…The previous results reported by our co-author in Rui et al [21] confirmed that KAM serves as a qualitative description of true dislocations density distribution using the coupled Electron Backscatter Diffraction and Electron Channeling Contrast Imaging observations. KAM plotted as a map reveals areas with an increased density of the defects, and as an average value for the whole scan, may reflect material strain history [21][22][23][24][25]. The KAM map is very similar with its GND map, as shown in Calcagnotto et al [22].…”

Section: Introductionmentioning

confidence: 53%

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Effects of Pulsed Magnetic Fields of Different Intensities on Dislocation Density, Residual Stress, and Hardness of Cr4Mo4V Steel

Hou

et al. 2020

Crystals

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To study the effects of pulsed magnetic fields of different intensities on the dislocation density, residual stress, and hardness of Cr4Mo4V steel, magnetic treatment is conducted at 0, 1.0, 1.3, 1.5, 2.0, and 2.5 T. The dislocation density and residual stress are measured using Electron Backscatter Diffraction (EBSD) and X-ray technique, respectively. The results reveal the dislocation density and compressive residual stress decrease at lower magnetic fields such as 1.0 T and 1.3 T, while they increase at higher magnetic fields such as 2.0 T and 2.5 T. The average value of kernel averaged misorientation (KAM) and compressive residual stress decrease about 10.4% and 15.8%, respectively, at 1.0 T, while they increase about 5.88% and 18.2%, respectively, at 2.5 T. The average value of hardness decreases about 3.5% at 1.0 T, from 817 HV to 787 HV. With the increments of intensities, the hardness of the treated samples increases. The hardness essentially remains unchanged at 2.0 T and 2.5 T. The reason for the dislocation motion under the action of pulsed magnetic fields is discussed.

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Section: Introductionmentioning

confidence: 53%

“…This EDAX OIM software was used to calculate KAM values and maps. KAM is calculated using only the nearest neighbors (one step or first order KAM), maximum misorientation of 5 • , and all points in the kernel [25]. The inverse pole figure and phase distribution map are also calculated using this EDAX OIM software.…”

Section: Ebsd Testsmentioning

confidence: 99%

Effects of Pulsed Magnetic Fields of Different Intensities on Dislocation Density, Residual Stress, and Hardness of Cr4Mo4V Steel

Hou

et al. 2020

Crystals

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“…The nominal element composition is given in Table 1. One may see also that the selected material has a smaller grain size (~10-15 µm, Table 1), compared to many commercial 304L heats (e.g., 304L heat investigated earlier [19]).…”

Section: Tested Materials and Specimen Geometrymentioning

confidence: 92%

“…This scanning electron microscope (SEM) is equipped with an advanced Oxford Symmetry EBSD system (detector resolution 1244 × 1024 pixels, EBSD indexing rate up to ~200 Hz in full-frame mode, and ~3.5 kHz in 8 × 8 binning mode). The SEM has a slightly larger chamber compared to the VERSA 3D SEM, used previously [18], allowing for easier installation and operation of the Kammrath & Weiss in situ tensile frame [18,19]. For this SEM, the EBSD detector may be fully inserted (insertion distance >175 mm) when the tensile stage is installed in the chamber.…”

Section: Sem/ebsd System and Miniature Tensile Frame For In Situ Testingmentioning

confidence: 99%

“…For this SEM, the EBSD detector may be fully inserted (insertion distance >175 mm) when the tensile stage is installed in the chamber. It allows for recording Kikuchi patterns with a much larger solid angle, compared to the VERSA 3D SEM used earlier [18,19]. Whereas the pattern appearance (i.e., brightness, contrast, noise level) may depend on particular scan conditions, the increased solid angle is a significant advantage for use with HR-EBSD techniques, providing much better angular resolution.…”

Section: Sem/ebsd System and Miniature Tensile Frame For In Situ Testingmentioning

confidence: 99%

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Analysis of Localized Deformation Processes in Highly Irradiated Austenitic Stainless Steel through In Situ Techniques

Gussev

Bellefon

Rosseel

2019

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Prediction of Flow Stress and Characterizing the Deformation Mechanism of As‐Extruded 7005 Aluminum Alloy

Lin,

Tzeng

2024

Adv Eng Mater

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This study explores isothermal hot compression of the as‐extruded 7005 aluminum alloy within a temperature range of 573–823 K, with strain rates from 0.001 to 1 s−1 and a strain of 1.2. Three constitutive equations, employing hyperbolic sine, power law, and exponential functions, were formulated and compared to predict rheological peak stress accuracy and applicability. The results indicate that the hyperbolic sine function is suitable across all stress levels, the power law function for low stress (< 56 MPa), and the exponential function for high stress (> 56 MPa). Introducing a strain compensation function enhances hyperbolic sine function accuracy. The stress exponent (n) and activation energy (Q) decrease with increased deformation, indicating a transition in the deformation mechanism from early‐stage dislocation climb to later‐stage dislocation glide. At 773 K with strain > 0.6, the presence of precipitates maintains the n value at approximately 4. Solute atoms (Zn, Mg, and Zr) and precipitates (MgZn2 and Al3Zr) impede diffusion and dislocation motion, resulting in deformation activation energies surpassing pure aluminum. Additionally, kernel average misorientation maps demonstrate that higher deformation temperatures and lower strain rates reduce internal residual stresses.This article is protected by copyright. All rights reserved.

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In situ SEM-EBSD analysis of plastic deformation mechanisms in neutron-irradiated austenitic steel

Cited by 128 publications

References 67 publications

Effects of Pulsed Magnetic Fields of Different Intensities on Dislocation Density, Residual Stress, and Hardness of Cr4Mo4V Steel

Effects of Pulsed Magnetic Fields of Different Intensities on Dislocation Density, Residual Stress, and Hardness of Cr4Mo4V Steel

Analysis of Localized Deformation Processes in Highly Irradiated Austenitic Stainless Steel through In Situ Techniques

Prediction of Flow Stress and Characterizing the Deformation Mechanism of As‐Extruded 7005 Aluminum Alloy

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