SIMS and TEM investigation of hydrogen trapping on implantation defects in a nickel-based superalloy

Jambon, Fanny; Marchetti, L.; Sennour, Mohamed; Jomard, François; Chêne, J.

doi:10.1016/j.jnucmat.2015.07.045

Cited by 23 publications

(12 citation statements)

References 28 publications

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“…This is an illustration of the enhancement of the mobility of dislocations and point defects in the presence of hydrogen. Similar effects are observed at 200°C Quantitative TEM image analysis of the distribution of faulted loops (a,b) and cavities (c) in Ni + implanted alloy 600 after deuteration and one month ageing at room temperature[27]. (a) Without deuteration, (b) after deuteration and (c) cavity size evolution.…”

supporting

confidence: 60%

“…with irradiation-induced defects [27]. According to figure 7, a significant H trapping occurs up to 200°C in the implanted zone.…”

Section: (Iii) Quantitative Analysis Of H Interactions With Microstructural Defects In Alloy 600mentioning

confidence: 92%

“…[27] suggesting that H-defects interactions can be operative in the working temperature range of PWR. On the other hand, the matrix signal ( 58 Ni), recorded during SIMS analysis to characterize the abrasion rate, is larger in the presence of deuterium in the implanted zone [27]. As the abrasion yield directly depends on the bonding energy of metal atoms in the matrix, its enhancement in the deuterated zone is a direct indication of the detrimental role of H on the cohesion of the metallic structure.…”

Section: (Iii) Quantitative Analysis Of H Interactions With Microstrumentioning

confidence: 99%

“…SIMS profiling of deuterium in Ni + implanted alloy 600 after 2 D charging at room temperature and annealing at different temperatures but constant diffusion length[27].with irradiation-induced defects[27]. According to figure 7, a significant H trapping occurs up to 200°C in the implanted zone.…”

mentioning

confidence: 97%

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Isotopic tracing of hydrogen transport and trapping in nuclear materials

Chêne

Martin

2017

Phil. Trans. R. Soc. A.

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Some illustrations of the use of deuterium or tritium for isotopic tracing of hydrogen absorption, transport and trapping in nuclear materials are presented. Isotopic tracing of hydrogen has been shown to be successful for the determination of the boundaries conditions for hydrogen desorption or absorption in a material exposed to a hydrogen source. Also, the unique capabilities of isotopic tracing and related techniques to characterize H interactions with point defects and dislocations acting as moving traps has been demonstrated. Such transport mechanisms are considered to play a major role in some stress corrosion cracking and hydrogen embrittlement mechanisms.This article is part of the themed issue 'The challenges of hydrogen and metals'.

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supporting

confidence: 60%

“…with irradiation-induced defects [27]. According to figure 7, a significant H trapping occurs up to 200°C in the implanted zone.…”

Section: (Iii) Quantitative Analysis Of H Interactions With Microstructural Defects In Alloy 600mentioning

confidence: 92%

Section: (Iii) Quantitative Analysis Of H Interactions With Microstrumentioning

confidence: 99%

mentioning

confidence: 97%

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Isotopic tracing of hydrogen transport and trapping in nuclear materials

Chêne

Martin

2017

Phil. Trans. R. Soc. A.

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“…The formation mechanism of hydrogen-induced cracking (HIC) has been extensively studied in numerous material systems [1][2][3][4][5][6]. Many HIC mechanisms have been proposed, mainly concerning two aspects: (1) the degradation of the mechanical properties of materials by hydrogen atoms and (2) the additional hydrogen gas pressure load promoting the material fracture.…”

Section: Introductionmentioning

confidence: 99%

Formation Criterion of Hydrogen-Induced Cracking in Steel Based on Fracture Mechanics

Fang

2018

Metals

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A new criterion for hydrogen-induced cracking (HIC) that includes both the embrittlement effect and the loading effect of hydrogen was obtained theoretically. The surface cohesive energy and plastic deformation energy are reduced by hydrogen atoms at the interface; thus, the fracture toughness is reduced according to fracture mechanics theory. Both the pressure effect and the embrittlement effect mitigate the critical condition required for crack instability extension. During the crack instability expansion, the hydrogen in the material can be divided into two categories: hydrogen atoms surrounding the crack and hydrogen molecules in the crack cavity. The loading effect of hydrogen was verified by experiments, and the characterization methods for the stress intensity factor under hydrogen pressure in a linear elastic model and an elastoplastic model were analyzed using the finite-element simulation method. The hydrogen pressure due to the aggregation of hydrogen molecules inside the crack cavity regularly contributed to the stress intensity factor. The embrittlement of hydrogen was verified by electrolytic charging hydrogen experiments. According to the change in the atomic distribution during crack propagation in a molecular dynamics simulation, the transition from ductile to brittle fracture and the reduction in the fracture toughness were due to the formation of crack tip dislocation regions suppressed by hydrogen. The HIC formation mechanism is both the driving force of crack propagation due to the hydrogen gas pressure and the resisting force reduced by hydrogen atoms.

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