Hydrogen transport in nickel-base alloys

Turnbull, A.; Ballinger, R. G.; Hwang, In-Kyeong; Morra, M. M.; Psaila-Dombrowski, M.; Gates, R. M.

doi:10.1007/bf03024530

Cited by 49 publications

(11 citation statements)

References 11 publications

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“…Before charging, samples were ground and then polished in diamond suspension and colloidal silica suspension finishing with a quality for EBSD. It is known that H diffusion coefficient is very low in Ni-based superalloys 63 , and in order to introduce sufficient amount of H into the samples, the following charging protocol was used 40 , 43 . Cathodic charging was conducted at 80 °C in a solution with NaCl (1 mol L −1 ) and distilled water.…”

Section: Methodsmentioning

confidence: 99%

Strain localisation and failure at twin-boundary complexions in nickel-based superalloys

Zhang

Yang

et al. 2020

Nat Commun

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Twin boundaries (TBs) in Ni-based superalloys are vulnerable sites for failure in demanding environments, and a current lack of mechanistic understanding hampers the reliable lifetime prediction and performance optimisation of these alloys. Here we report the discovery of an unexpected γ″ precipitation mechanism at TBs that takes the responsibility for alloy failure in demanding environments. Using multiscale microstructural and mechanical characterisations (from millimetre down to atomic level) and DFT calculations, we demonstrate that abnormal γ″ precipitation along TBs accounts for the premature dislocation activities and pronounced strain localisation associated with TBs during mechanical loading, which serves as a precursor for crack initiation. We clarify the physical origin of the TBs-related cracking at the atomic level of γ″-strengthened Ni-based superalloys in a hydrogen containing environment, and provide practical methods to mitigate the adverse effect of TBs on the performance of these alloys.

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Section: Methodsmentioning

confidence: 99%

Strain localisation and failure at twin-boundary complexions in nickel-based superalloys

Zhang

Yang

et al. 2020

Nat Commun

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“…Indeed, even if carbides are recognized as irreversible traps, there are too few of these particles in the grain boundaries to explain the high susceptibility to intergranular rupture in the presence of hydrogen. However, the location of these carbides could allow them to play a more prominent role than expected simply based on their concentration [24]. Hydrogen has been shown to segregate to grain boundaries in Ni and is likely to behave similarly in Ni-based alloys [25].…”

Section: Effect Of Hydrogen On Fracture Modes In Relation With Hydrogmentioning

confidence: 98%

Effect of trapping and temperature on the hydrogen embrittlement susceptibility of alloy 718

Galliano

Andrieu

Blanc

et al. 2014

Materials Science and Engineering: A

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International audienceNi-based alloy 718 is widely used to manufacture structural components in the aeronautic and nuclear industries. Numerous studies have shown that alloy 718 may be sensitive to hydrogen embrittlement. In the present study, the susceptibilities of three distinct metallurgical states of alloy 718 to hydrogen embrittlement were investigated to identify both the effect of hydrogen trapping on hydrogen embrittlement and the role of temperature in the hydrogen-trapping mechanism. Cathodic charging in a molten salt bath was used to saturate the different hydrogen traps of each metallurgical state. Tensile tests at different temperatures and different strain rates were carried out to study the effect of hydrogen on mechanical properties and failure modes, in combination with hydrogen content measurements. The results demonstrated that Ni-based superalloy 718 was strongly susceptible to hydrogen embrittlement between 25 °C and 300 °C, and highlighted the dominant roles played by the hydrogen solubility and the hydrogen trapping on mechanical behavior and fracture modes

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“…Turnbull et al [23] proposed that hydrogen atoms trapped by ␥ /␥ interfaces caused ductility loss in ␥ phase strengthened alloy, while Thompson and Brooks [7] stated that ␥ /␥ interfaces would not be capable of acting as sinks for hydrogen until coherent relationship lost during plastic deformation. Thus, with regard to the effect of hydrogen on alloys, identifying the hydrogen traps of the alloy is important to understand HE mechanism in the ␥ phase strengthened alloys [24,25].…”

Section: The / Interfacesmentioning

confidence: 98%

Mechanism of hydrogen embrittlement in a gamma-prime phase strengthened Fe–Ni based austenitic alloy

Zhao

Chen

et al. 2012

Materials Science and Engineering: A

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Hydrogen transport in nickel-base alloys

Cited by 49 publications

References 11 publications

Strain localisation and failure at twin-boundary complexions in nickel-based superalloys

Strain localisation and failure at twin-boundary complexions in nickel-based superalloys

Effect of trapping and temperature on the hydrogen embrittlement susceptibility of alloy 718

Mechanism of hydrogen embrittlement in a gamma-prime phase strengthened Fe–Ni based austenitic alloy

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