Using transmission Kikuchi diffraction to study intergranular stress corrosion cracking in type 316 stainless steels

Meisnar, Martina; Vilalta‐Clemente, Arantxa; Gholinia, Ali; Moody, Michael P.; Wilkinson, Angus J.; Huin, Nicolas; Lozano-Pérez, Sergio

doi:10.1016/j.micron.2015.04.011

Cited by 43 publications

(34 citation statements)

References 33 publications

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“…For the off-axis configuration, the detector was positioned in such a way that the pattern center projection (PC) lied right above the detector. The sample-detector distance (DD) was set to a distance equal to the average value used by different authors (Brodusch et al, 2013b;Meisnar et al, 2015). For the on-axis configuration, the PC is set in the middle of the detector.…”

Section: Methodsmentioning

confidence: 99%

On‐axis versus off‐axis Transmission Kikuchi Diffraction technique: application to the characterisation of severe plastic deformation‐induced ultrafine‐grained microstructures

Yuan

Brodu

Chen

et al. 2017

Journal of Microscopy

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A new configuration for Transmission Kikuchi Diffraction (TKD) in a scanning electron microscope is presented; called 'on-axis TKD'. Compared to the usual off-axis configuration, the scintillator is placed perpendicular to the incident beam under the electron-transparent sample, not in vertical position. In this way, the setup benefits from intense forward scattered electrons enabling short acquisition times. At equivalent diffraction pattern quality, the electron dose needed on the sample is estimated to be 20 times lower in comparison to the off-axis configuration. The technique is particularly suited to the characterisation of severe plastic deformation induced ultrafine grained microstructures. The evolution of the microstructure of an Al-Mg alloy deformed by high pressure tube twisting was analysed. It is shown that the grain refinement was in the steady state stage for a shear strain of 24 with a mean grain size of 120 nm.

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Section: Methodsmentioning

confidence: 99%

On‐axis versus off‐axis Transmission Kikuchi Diffraction technique: application to the characterisation of severe plastic deformation‐induced ultrafine‐grained microstructures

Yuan

Brodu

Chen

et al. 2017

Journal of Microscopy

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“…, ). Consequently, t‐EBSD is more suitable for mapping ultrafine‐grained materials and nanosized particles (Suzuki, ,b; Garner et al ., ; Meisnar et al ., ). Trimby et al .…”

Section: Introductionmentioning

confidence: 97%

Effect of microscope parameter and specimen thickness of spatial resolution of transmission electron backscatter diffraction

Wang

Kong

Liu

et al. 2016

Journal of Microscopy

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The spatial resolution of transmission electron backscatter diffraction (t-EBSD) with a standard conventional EBSD detector was evaluated quantitatively based on the calculation of the correlation coefficient of transmission patterns which were acquired across a twin boundary in the sample of austenitic steel. The results showed that the resolution of t-EBSD improved from tens of nanometres to below 10 nm with increasing accelerating voltage and thinning of specimen thickness. High voltage could enhance the penetration depth and reduce the scattering angle. And the thinning of specimen thickness would result in decreasing of the scattering events according to the theory of thermal diffuse scattering (TDS). In addition, the transmission patterns were found to be weak and noisy if the specimen was too thin, because of the decreasing intensity detected by the screen. Consequently, in this work, the best spatial resolution of 7 nm was achieved at 30 kV and 41 nm thickness. Moreover, the specimen thickness range was also discussed using Monte-Carlo simulation. This approach was helpful to account for the differences of measured spatial resolutions, by t-EBSD, of lamellas with different thickness.

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“…However, most studies do not take into account crystallographic aspects such as grain misorientation, local plastic deformation and strain localization in the area surrounding the crack tip. In this effort, transmission Kikuchi diffraction (TKD) has been proven to be very beneficial in revealing the extent of the strain concentration around the crack tips of 316 stainless steel and its effect on SCC [12] [13]. Therefore, an in-depth characterization effort providing information at high resolution and nm length scales combining chemical analysis Electron Energy Loss Spectroscopy (EELS) and Energy-dispersive X-ray spectroscopy, (EDX) and local stress and strain measurements (TKD) could contribute to solve some of the remaining questions.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Characterisation of Austenitic Stainless Steel in PWR Environments: Effect of Strain and Surface Finish on Crack Initiation and Propagation

Pimentel

Tice

Addepalli

et al. 2017

The Minerals, Metals &Amp; Materials Series

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S. (2018). High-resolution characterisation of austenitic stainless steel in PWR environments: effect of strain and surface finish on crack initiation and propagation. In AbstractInitiation and propagation of cracks under simulated primary water conditions and different slow strain rates have been studied for an austenitic 304-type stainless steel. Two surface finishes were used to better understand the conditions that trigger stress corrosion cracking (SCC).The main objective is to identify the mechanism(s) that govern the initiation and propagation of SCC and the influence of microstructure. Crack morphology, stress localisation and local chemical composition were characterized for all samples studied. The characterization methodology includes scanning electron microscopy (SEM), 3D focused ion beam (FIB), Transmission Kikuchi Diffraction (TKD), and analytical scanning transmission electron microscopy (STEM).

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Using transmission Kikuchi diffraction to study intergranular stress corrosion cracking in type 316 stainless steels

Cited by 43 publications

References 33 publications

On‐axis versus off‐axis Transmission Kikuchi Diffraction technique: application to the characterisation of severe plastic deformation‐induced ultrafine‐grained microstructures

On‐axis versus off‐axis Transmission Kikuchi Diffraction technique: application to the characterisation of severe plastic deformation‐induced ultrafine‐grained microstructures

Effect of microscope parameter and specimen thickness of spatial resolution of transmission electron backscatter diffraction

High-Resolution Characterisation of Austenitic Stainless Steel in PWR Environments: Effect of Strain and Surface Finish on Crack Initiation and Propagation

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