Environmentally induced crack (EIC) initiation, propagation, and failure: A 3D in-situ time-lapse study of AA5083 H131

Gudla, Visweswara Chakravarthy; Storm, Malte; Palmer, Benjamin C.; Lewandowski, John J.; Withers, Philip J.; Holroyd, N.J.H.; Burnett, Timothy L.

doi:10.1016/j.corsci.2020.108834

Cited by 15 publications

(10 citation statements)

References 69 publications

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“…After extended exposure times, the mean crack volume was an order of magnitude greater than the median, showing the large asymmetry of the population. Similar behaviour was observed for the environmentally induced cracking of AA5083, where only about 10% of cracks grew to a large size beyond 800 µm (Gudla et al 2020). 3.…”

Section: Crack Volume Distributionsupporting

confidence: 75%

“…Gudla et al suggested a sequence for environmentally induced cracking with six steps: precursor, incubation, nucleation, crack growth of cracks susceptible to arrest, sustained crack propagation and final fracture (Gudla et al 2020). In this case, the precursor stage involves loading the sample in tension and increasing the temperature and moisture in the environment to enable cracking.…”

Section: Effect Of Microstructure On Crack Growthmentioning

confidence: 99%

“…For example, Gudla et al used synchrotron tomography to analyse the environmentally induced cracking behaviour of AA5083 during slow strain rate tensile testing. In this case, tomograms with 1200 projections were acquired within 90 s, allowing them to obtain 22 tomograms within a period of 68 min (Gudla et al 2020). This permitted the identification of crack initi- ation sites and the characterisation of the crack growth behaviour.…”

Section: Introductionmentioning

confidence: 99%

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3D characterisation of hydrogen environmentally assisted cracking during static loading of AA7449-T7651

et al. 2021

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In this investigation, synchrotron X-ray microtomography was used to perform 3D in situ observations of crack initiation and growth during hydrogen environmentally assisted cracking (HEAC) in tensile samples of AA7449-T7651. Two smooth tensile samples with a 1 mm diameter gauge section were held at a fixed displacement ($$\approx 30$$ ≈ 30 % of yield stress) in warm, moist air ($$\approx 76\,^\circ $$ ≈ 76 ∘ C, 73% relative humidity). The samples were then imaged repeatedly using X-ray tomography until they fractured completely. The tomograms showing the nucleation and evolution of intergranular cracks were correlated with electron microscopy fractographs. This enabled the identification of crack initiation sites and the characterisation of the crack growth behaviour relative to the microstructure. The samples were found to fracture within an environmental exposure time of 240 min. Some cracks in both samples nucleated within an exposure time of 80 min (33–40% of the total lifetime). Many cracks were found to nucleate both internally and at the sample surface. However, only superficial cracks contributed to the final fracture surface as they grew faster owing to the direct environmental exposure and the larger crack opening. HEAC occurred prominently via brittle intergranular cracking, and cracks were found to slow down when approaching grain boundary triple junctions. Additionally, crack shielding from nearby cracks and the presence of coarse Al–Cu–Fe particles at the grain boundaries were also found to temporarily reduce the crack growth rates. After prolonged crack growth, the HEAC cracks displayed ductile striations and transgranular fracture, revealing a change in the crack growth mechanism at higher stress intensity factors.

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Section: Crack Volume Distributionsupporting

confidence: 75%

Section: Effect Of Microstructure On Crack Growthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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3D characterisation of hydrogen environmentally assisted cracking during static loading of AA7449-T7651

et al. 2021

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“…The HEAC lifetime of components can be described by: crack nucleation at locations with critical hydrogen concentrations; growth of microstructurally short cracks; sustained crack propagation and fracture [14]. The lifetime of components is mainly dependent on the initial stages of HEAC, namely crack initiation and microstructurally short cracking.…”

Section: Introductionmentioning

confidence: 99%

Development of a microstructural cohesive zone model for intergranular hydrogen environmentally assisted cracking

Francisco

Larrosa

Peel

2022

Engineering Fracture Mechanics

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“…Hydrogen embrittlement -also referred to as hydrogen induced internal cracks or hydrogen delamination -is a well-documented and much-observed process that impacts many kinds of metals in a hydrogen saturated environment (e.g., [1][2][3][4][5][6]). The negative effects of hydrogen embrittlement include internal and external blistering, which lead to decreased load, tension, and stress capacities [1,4,7,8]. Hydrogen embrittlement also leads to the failing and bursting of metal components such as pipes and boiler tubes (e.g.…”

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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Environmentally induced crack (EIC) initiation, propagation, and failure: A 3D in-situ time-lapse study of AA5083 H131

Cited by 15 publications

References 69 publications

3D characterisation of hydrogen environmentally assisted cracking during static loading of AA7449-T7651

3D characterisation of hydrogen environmentally assisted cracking during static loading of AA7449-T7651

Development of a microstructural cohesive zone model for intergranular hydrogen environmentally assisted cracking

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

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