Effect of temperature on hydrogen embrittlement susceptibility of alloy 718 in Light Water Reactor environment

Galliano, Florian; Andrieu, Éric; Cloué, Jean‐Marc; Odemer, Grégory; Blanc, Christine

doi:10.1016/j.ijhydene.2017.06.211

Cited by 18 publications

(4 citation statements)

References 31 publications

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“…The same observations were done for tensile tests performed at 10-6 s-1 . Therefore, it could be concluded that hydrogen had no effect on crack initiation step on the surface of smooth tensile specimen, but it affected the final fracture, in agreement with another study about Ni-base alloy [46]. Furtherrnore, another interesting result was the decrease in the elongation to failure for as-polished T4 and 150-20 specimens when the strain rate decreased from 10-3 to 10-6 s-1 , as previously mentioned.…”

Section: First Observations Of the Hydrogen-dislocation Interactionssupporting

confidence: 88%

Hydrogen - dislocation interactions in a low-copper 7xxx aluminium alloy: About the analysis of interrupted stress corrosion cracking tests

Oger

Andrieu

Odemer

et al. 2020

Materials Science and Engineering: A

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Aluminium alloys are susceptible to stress corrosion cracking (SCC) in specific conditions, which can be asso ciated with hydrogen embrittlement (HE). Interrupted SCC tests are often performed to evaluate the suscepti bility of the samples to a specific environment under mechanical loading. Those tests consist in a pre-corrosion step, which can lead to hydrogen-precharging, followed by a tensile test in air. The present study, perfonned on a 7046 aluminium alloy, confinned literature data showing that tensile tests in laboratory air on as-polished samples at sufficiently low strain rates led to a significant hydrogen ingress. Depending on the sample micro structure, varions hydrogen-dislocations and dislocations-microstructure interactions could be effective leading to a change in the tensile behaviour of the samples. Such a phenomenon cotùd lead to misinterpret the interrupted sec tests perfonned on hydrogen-precharged sarnples. In the present study, a corrected sec sus ceptibility factor was defined to better analyse the interrupted SCC tests.

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Section: First Observations Of the Hydrogen-dislocation Interactionssupporting

confidence: 88%

Hydrogen - dislocation interactions in a low-copper 7xxx aluminium alloy: About the analysis of interrupted stress corrosion cracking tests

Oger

Andrieu

Odemer

et al. 2020

Materials Science and Engineering: A

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“…HE was still observed at 500 • C and increased as the testing temperature fell and the d phase increased. Corrosion-induced HE of alloy 718 was also studied at 80 and 300 • C by applying SSR tensile tests in an autoclave after exposure at 300 • C in a primary water environment [94]. The effect of hydrogen at 300 • C was attributed to the presence of metallurgical traps that were still active at this temperature.…”

Section: He In Alloys At Elevated Temperaturesmentioning

confidence: 99%

Material Challenges and Hydrogen Embrittlement Assessment for Hydrogen Utilisation in Industrial Scale

Ilyushechkin,

Schoeman,

Carter

et al. 2023

Hydrogen

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Hydrogen has been studied extensively as a potential enabler of the energy transition from fossil fuels to renewable sources. It promises a feasible decarbonisation route because it can act as an energy carrier, a heat source, or a chemical reactant in industrial processes. Hydrogen can be produced via renewable energy sources, such as solar, hydro, or geothermic routes, and is a more stable energy carrier than intermittent renewable sources. If hydrogen can be stored efficiently, it could play a crucial role in decarbonising industries. For hydrogen to be successfully implemented in industrial systems, its impact on infrastructure needs to be understood, quantified, and controlled. If hydrogen technology is to be economically feasible, we need to investigate and understand the retrofitting of current industrial infrastructure. Currently, there is a lack of comprehensive knowledge regarding alloys and components performance in long-term hydrogen-containing environments at industrial conditions associated with high-temperature hydrogen processing/production. This review summarises insights into the gaps in hydrogen embrittlement (HE) research that apply to high-temperature, high-pressure systems in industrial processes and applications. It illustrates why it is still important to develop characterisation techniques and methods for hydrogen interaction with metals and surfaces under these conditions. The review also describes the implications of using hydrogen in large-scale industrial processes.

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“…Even minimal concentrations of hydrogen can lead to the embrittlement of metals and alloys. This embrittlement significantly diminishes their mechanical properties, thereby posing risks to the structural integrity and safety of the pipelines [11][12][13]. When hydrogen gas is transported through pipelines, it adsorbs and diffuses into the metal, altering the metal lattice structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Element on Hydrogen Adsorption and Diffusion on α-Fe(110) Surfaces: First Principles Study

Zhang,

Jiang

et al. 2024

Metals

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Based on first principles density functional theory (DFT) methods, this study employed the Cambridge Serial Total Energy Package (CASTEP) module within Materials Studio (MS) software under the generalized gradient approximation to investigate the adsorption, diffusion behavior, and electronic properties of hydrogen atoms on α-Fe(110) and α-Fe(110)-Me (Mn, Cr, Ni, Mo) surfaces, including calculations of their adsorption energies and density of states (DOS). The results demonstrated that doping with alloy atoms Me increased the physical adsorption energy of H2 molecules on the surface. Specifically, Mo doping elevated the adsorption energy from −1.00825 eV to −0.70226 eV, with the largest relative change being 30.35%. After doping with Me, the chemical adsorption energy of two hydrogen atoms does not change significantly, among which doping with Cr results in a decrease in the chemical adsorption energy. Building on this, further analysis of the chemical adsorption of single atoms on the surface was conducted. By comparing the adsorption energy and the bond length between a hydrogen atom and iron/dopant metal atom, it was found that Mo doping has the greatest impact, increasing the bond length by 58.58%. Analysis of the DOS functions under different doping conditions validated the interaction between different alloy elements and H atoms. Simultaneously, simulations were carried out on the energy barrier crossed by H atoms diffusing into the metal interior. The results indicate that Ni doping facilitates the diffusion of H atoms, while Cr, Mn, and Mo hinder their diffusion, with Mo having the most significant effect, where its barrier is 21.88 times that of the undoped surface. This conclusion offers deep insights into the impact of different doping elements on hydrogen adsorption and diffusion, aiding in the design of materials resistant to hydrogen embrittlement.

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Effect of temperature on hydrogen embrittlement susceptibility of alloy 718 in Light Water Reactor environment

Cited by 18 publications

References 31 publications

Hydrogen - dislocation interactions in a low-copper 7xxx aluminium alloy: About the analysis of interrupted stress corrosion cracking tests

Hydrogen - dislocation interactions in a low-copper 7xxx aluminium alloy: About the analysis of interrupted stress corrosion cracking tests

Material Challenges and Hydrogen Embrittlement Assessment for Hydrogen Utilisation in Industrial Scale

Effects of Alloying Element on Hydrogen Adsorption and Diffusion on α-Fe(110) Surfaces: First Principles Study

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