Defects Responsible for Hydrogen Embrittlement in Austenitic Stainless Steel 304 by Positron Annihilation Lifetime Spectroscopy

Chiari, Luca; Komatsu, Akari; Fujinami, Masanori

doi:10.2355/isijinternational.isijint-2020-670

Cited by 10 publications

(2 citation statements)

References 33 publications

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“…Chiari et al [59], through a positron annihilation lifetime spectroscopy study on 304 stainless steel, confirmed that hydrogen diffuses into a deeper region after the application of tensile stress. Simultaneously, vacant hydrogen complexes are generated in this region and develop into vacant clusters.…”

Section: Resultsmentioning

confidence: 89%

Crack Extension Analysis of Atmospheric Stress Corrosion Based on Peridynamics

2022

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Based on peridynamics, an atmospheric stress corrosion model was proposed. In this model, the role of hydrogen and stress in anodic-dissolution-dominated stress corrosion cracking was considered, and atmospheric corrosion was characterized by the change in liquid film thickness on the metal surface in the atmospheric environment. The near-field kinetic anodic dissolution model and the atmospheric corrosion model were coupled by varying the liquid film thickness. The thickness of the liquid film depended on factors such as the temperature, relative humidity, and hygroscopic salts. We validated the model using stress corrosion behavior from the literature for 304 stainless steel in a simulated atmospheric environment. The results of the model captured the crack expansion process. The obtained crack expansion direction and branching behavior agreed well with the experimental results in the literature.

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Section: Resultsmentioning

confidence: 89%

Crack Extension Analysis of Atmospheric Stress Corrosion Based on Peridynamics

2022

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“…Sakaki et al 8) applied positron annihilation lifetime spectroscopy (PALS) to the pure iron specimen hydrogen-charged simultaneously with 20% tensile deformation, and found that the vacancy concentration was 4 times higher than that without hydrogen charging. By means of TDA and PALS, the acceleration of vacancy formation and clustering during plastic deformation by hydrogen has been demonstrated also in a tempered martensitic steel 9) , cold-drawn pearlitic steel 10) and metastable austenitic stainless steel 11) .…”

Section: Introductionmentioning

confidence: 97%

Visualization of Hydrogen and Hydrogen-induced Defects in Tensile-deformed Pure Iron Using Hydrogen Microprint and Tritium Autoradiography

Manaka,

Itoh,

Kobayashi

et al. 2024

ISIJ Int.

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To understand the process and mechanism for hydrogen embrittlement in steels, visualization of the location of hydrogen is essential. In the present study, two visualization techniques, hydrogen microprint technique (HMT) and tritium autoradiography (TAR), were applied to a pure iron sheet 20% tensile-deformed with cathodic hydrogen charging. When the specimen was covered with photographic emulsion shortly (40 min) after the deformation, HMT showed that the charged hydrogen atoms diffused out at majorly grain boundaries and minorly in the grain interiors. The TAR, conducted on the same sample but completely de-hydrogenated and then charged with tritium, revealed that hydrogen enhances the formation of vacancies or vacancy clusters with plastic deformation, which are located along grain boundaries and deformation bands and act as relatively stable trapping sites for tritium.

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Interactions of Hydrogen with Lattice Defects

Nagumo

2023

Fundamentals of Hydrogen Embrittlement

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Defects Responsible for Hydrogen Embrittlement in Austenitic Stainless Steel 304 by Positron Annihilation Lifetime Spectroscopy

Cited by 10 publications

References 33 publications

Crack Extension Analysis of Atmospheric Stress Corrosion Based on Peridynamics

Crack Extension Analysis of Atmospheric Stress Corrosion Based on Peridynamics

Visualization of Hydrogen and Hydrogen-induced Defects in Tensile-deformed Pure Iron Using Hydrogen Microprint and Tritium Autoradiography

Interactions of Hydrogen with Lattice Defects

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