Hydrogen suppression of dislocation cell formation in micro and nano indentation of pure iron single crystals

Gong, Peng; Katzarov, Ivaylo H.; Nutter, John; Paxton, Anthony; Wynne, B.P.; Rainforth, W.M.

doi:10.1016/j.scriptamat.2020.113683

Cited by 8 publications

(7 citation statements)

References 27 publications

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Section: Discussionsupporting

confidence: 67%

“…It should be noted that such surface cracks are independent of the manufacturing process, and the L-PBF prior to the H charging may not be responsible for their formation. Such surface cracks in the longitudinal direction of failed samples were also detected and reported in [25] for the casted/annealed samples. Irrespective of the surface damage caused by H charging that is independent of the manufacturing process, the origin of the lower UTS*UE of hydrogen-doped 316L ASS can be explained by the following observations: The MPBs can act as nucleation and propagation sites for hydrogen-assisted cracking (see Figure 4).…”

Section: Discussionsupporting

confidence: 67%

“…The samples were immersed in a distilled water solution containing 3 wt.% NaCl and 0.3 wt.% NH 4 SCN. The efficiency of this solution in the H permeation was reported several times in the literature [19,[21][22][23][24][25][26][27][28][29]. Ammonium thiocyanate (NH 4 SCN) is widely used as a reagent (hydrogen recombination poison) for promoting hydrogen absorption by steels, and during hydrogen charging, the solution was de-aerated with N 2 [22,30].…”

Section: Methodsmentioning

confidence: 96%

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Effect of Hydrogen on the Tensile Behavior of Austenitic Stainless Steels 316L Produced by Laser-Powder Bed Fusion

Khaleghifar¹,

Razeghi²,

Heidarzadeh

et al. 2021

Metals

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Hydrogen was doped in austenitic stainless steel (ASS) 316L tensile samples produced by the laser-powder bed fusion (L-PBF) technique. For this aim, an electrochemical method was conducted under a high current density of 100 mA/cm2 for three days to examine its sustainability under extreme hydrogen environments at ambient temperatures. The chemical composition of the starting powders contained a high amount of Ni, approximately 12.9 wt.%, as a strong austenite stabilizer. The tensile tests disclosed that hydrogen charging caused a minor reduction in the elongation to failure (approximately 3.5% on average) and ultimate tensile strength (UTS; approximately 2.1% on average) of the samples, using a low strain rate of 1.2 × 10−4 s−1. It was also found that an increase in the strain rate from 1.2 × 10−4 s−1 to 4.8 × 10−4 s−1 led to a reduction of approximately 3.6% on average for the elongation to failure and 1.7% on average for UTS in the pre-charged samples. No trace of martensite was detected in the X-ray diffraction (XRD) analysis of the fractured samples thanks to the high Ni content, which caused a minor reduction in UTS × uniform elongation (UE) (GPa%) after the H charging. Considerable surface tearing was observed for the pre-charged sample after the tensile deformation. Additionally, some cracks were observed to be independent of the melt pool boundaries, indicating that such boundaries cannot necessarily act as a suitable area for the crack propagation.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionsupporting

confidence: 67%

Section: Methodsmentioning

confidence: 96%

See 1 more Smart Citation

Effect of Hydrogen on the Tensile Behavior of Austenitic Stainless Steels 316L Produced by Laser-Powder Bed Fusion

Khaleghifar¹,

Razeghi²,

Heidarzadeh

et al. 2021

Metals

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“…Similar considerations apply to the period of the crack growth. As (15) shows, in the long-time approximation, the crack grows with a constant velocity that does not depend on its radius, a, and thickness, h. The growth time, t, should now be compared to the characteristic relaxation time, td = a 2 /D, which, contrary to t0, is not a constant but, obviously, has a meaning of the diffusion time scale corresponding to the changing crack radius, a. For t > td, the hydrogen concentration, c, can be considered steady because the diffusion process has enough time to adjust the concentration for every crack growth increment.…”

Section: Analysis Of Results and Pade Approximationmentioning

confidence: 99%

“…Multiple factors effect hydrogen embrittlement, including crystallographic orientations, grain boundaries, dislocations, and hydrogen trapping (e.g., [1,4,8,11,14,15]). The orientation and layout of grain boundaries have a significant impact on crack formation, especially since deformations and cavities are often positioned along the grain boundaries (e.g., [1,8,16,17]).…”

Section: Introductionmentioning

confidence: 99%

Study of Hydrogen Embrittlement in Pipelines and Nuclear Power Plants: Estimates for Durability

Dashevskiy¹,

Sims²

2022

JEPT

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Due to the increasing need to further develop the world gas and oil industry and the increased public attention to clean energy sources, studying and preventing Hydrogen Induced Cracking is one of the main safety concerns in nuclear power plants, oil pipelines and platforms. In this article, the growth and incubation times for internal Hydrogen Induced Cracks (HIC) are examined. Specifically, these times are modeled in two separate phases - the first phase (I) is a long time approximation, when the crack growth is believed to be slow such that the equilibrium state for gas concentration establishes instantaneously, and the stationary diffusion problem can be solved for each moment of time. The second phase (II) is a short time approximation, when the crack growth is rapid and the concentration of atomic hydrogen is dependent on time. Closed-form solutions are obtained in both cases and are then coupled using a Padé approximation.

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Atomistic Investigation of the Influence of Hydrogen on Mechanical Response during Nanoindentation in Pure Iron

Lou

Cheng

Wang

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Hydrogen suppression of dislocation cell formation in micro and nano indentation of pure iron single crystals

Cited by 8 publications

References 27 publications

Effect of Hydrogen on the Tensile Behavior of Austenitic Stainless Steels 316L Produced by Laser-Powder Bed Fusion

Effect of Hydrogen on the Tensile Behavior of Austenitic Stainless Steels 316L Produced by Laser-Powder Bed Fusion

Study of Hydrogen Embrittlement in Pipelines and Nuclear Power Plants: Estimates for Durability

Atomistic Investigation of the Influence of Hydrogen on Mechanical Response during Nanoindentation in Pure Iron

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