Lattice defects dominating hydrogen-related failure of metals

Takai, Kenichi; Shoda, H.; Suzuki, Hiroshi; Nagumo, Michihiko

doi:10.1016/j.actamat.2008.06.031

Cited by 312 publications

(136 citation statements)

References 40 publications

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“…disordering of the GB structure. It is commonly accepted that hydrogen in metals potentially stabilizes the point defects and enhances the generation of non-thermal equilibrium superabundant vacancies as reported by Nagumo et al [23,24], demonstrating a possibility that the agglomeration of those stabilized vacancies can result in the nucleation of microvoids along the GBs. Recently, Lawrence et al investigated the density of vacancies and vacancy clusters in hydrogen pre-charged single crystalline and polycrystalline pure nickel after tensile deformation by means of thermal desorption spectroscopy (TDA) and positron annihilation spectroscopy (PAS), and reported that polycrystalline material showed higher peak temperature in TDS and longer positron lifetime in PAS [25].…”

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confidence: 99%

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

et al. 2018

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Abstract. The role of hydrogen on intergranular (IG) fracture in hydrogen-assisted fatigue crack growth (HAFCG) of a pure iron at low stress intensity was discussed in terms of the microscopic deformation structures near crack propagation paths. The main cause of IG fracture was assumed to be the hydrogen-enhanced dislocation structure evolution and subsequent microvoids formation along the grain boundaries. Additionally, the impact of such IG cracking on the macroscopic FCG rate was evaluated according to the dependency of IG fracture propensity on the hydrogen gas pressure. It was first demonstrated that the increased hydrogen pressure results in the larger area fraction of IG and corresponding faster FCG rate. Moreover, gaseous hydrogen environment also had a positive influence on the FCG rate due to the absence of oxygen and water vapor. The macroscopic crack propagation rate was controlled by the competition process of said positive and negative effects.

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confidence: 99%

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

et al. 2018

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“…3, or the results for pure iron in Ref. 15)). We believe a more multipronged approach is ultimately required to completely understand hydrogen embrittlement.…”

Section: Resultsmentioning

confidence: 99%

“…[10][11][12][13][14] Because the localized deformation is the result of interaction between many lattice defects, measurements on a macroscopic scale are also important. In addition, the strong interaction of hydrogen with lattice defects other than dislocations [15][16][17][18] must not be overlooked.…”

Section: Introductionmentioning

confidence: 99%

Digital Image Correlation Measurement of Localized Deformation in Carbon Steel in the Presence of Hydrogen

Aomatsu

Matsumoto

2014

ISIJ Int.

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Although there have been many reports related to localized plastic deformation in the presence of hydrogen, this process has not been clearly elucidated to date. In our previous report, we conducted tensile tests on hydrogen-charged carbon steel S25C. Using the digital image correlation method, we were able to measure the time evolution of the equivalent strain distribution and the equivalent strain rate distribution up to the crack initiation around the notch bottom. We then revealed that the hydrogen induced an increase in the equivalent strain rate during the deformation process and a decrease in the equivalent strain when the time the crack started to grow. In this study, we performed similar measurements on carbon steels S15C and S55C and evaluated how the deformation progressed until the crack started to grow depending on the carbon content. The results showed a decrease in the local equivalent strain when the time the crack started to grow in all of the investigated materials, but we could not identify any clear trend with respect to a carbon-content dependence. However, we observed that smaller carbon contents (i.e., higher ferrite volume fractions) resulted in greater significance of the localization of the deformation due to the hydrogen and in a greater rate of increase in the local strain rate. In addition, on the basis of the equivalent strain distribution, we revealed that the deformation tended to localize in the ferrite phase.

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“…According to [16], the increase in their concentration could lead to the increased stability of hydrides in the hydride-forming elements, to the enhancement of metal atom diffusion and, in some cases, to the enhancement of creep. The suggestion about the primary role of hydrogen-induced vacancies in hydrogen-related failure was made by Nagumo et al [17] in the framework of the hydrogen-enhanced straininduced vacancy model [18].…”

Section: Hydrogen Effect On Interaction Between the Lattice Defectsmentioning

confidence: 99%

Hydrogen-Induced Effects in Annealed and Prestrained 316L-Type Stainless Steel Studied by Mechanical Spectroscopy

Shyvaniuk¹

2016

Metallofiz. Noveishie Tekhnol.

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Annealed and tensile prestrained 316L-type stainless steel is studied by internal friction (IF) method. Low-frequency forced-vibration measurements of IF are carried out in the temperature range of 130-500 K before and after gaseous-hydrogen charging at 543 K and under three different pressures: 0.5, 10, and 100 MPa. Two complex multicomponent IF peaks at about 250 and 365 K are detected after preliminary tensile deformation in hydrogenfree material. As revealed, the low-temperature peak is of relaxation type, and the high-temperature one is a resonant peak. The effect of hydrogen content and hydrogen distribution on IF peaks' features, e.g., background, amplitude and thermal stability, is examined. An increase in stability of vacancies caused by hydrogen is suggested that follows from IF measurements after ageing at 473 K. As experimentally shown, the temperature drop of hydrogenation to 358 K leads to a marked shift of the high-temperature peak toward higher temperatures. A hypothesis about the cause underlying this phenomenon is proposed.За допомогою механічної спектроскопії, а саме, міряння внутрішнього тертя, досліджено неіржавійну сталь типу 316L у відпаленому та дефор-мованому розтягом станах. Низькочастотні міряння внутрішнього тертя на вимушених коливаннях проводилися в температурному діапазоні від 130 до 500 К перед і після газового наводнювання при 543 К та трьох зна-ченнях тиску водню: 0,5, 10 та 100 МПа. Після деформації розтягом у ви-хідному матеріалі виявлено два мультикомпонентних піки при темпера-турах біля 250 та 365 К. Показано, що низькотемпературний пік має ре-лаксаційну природу, в той час як високотемпературний пік відноситься до резонансних. Також було перевірено вплив вмісту водню та його розпо-ділу на властивості піків внутрішнього тертя, а саме, на їх фон, амплітуду та термічну стабільність. Сформульовано припущення про те, що водень сприяє стабілізації вакансій, що випливає із експериментальних дослі-джень наводненої та зістареної при 473 К сталі. Експериментально пока-зано, що зниження температури наводнювання до 358 К призводить до С помощью механической спектроскопии, а именно, измерения внутрен-него трения, исследована нержавеющая сталь типа 316L в отожжённом и деформированном растяжением состояниях. Низкочастотные измерения внутреннего трения на вынужденных колебаниях проведены в темпера-турном диапазоне от 130 до 500 К до и после газового наводороживания при 543 К и трёх значениях давления водорода: 0,5, 10 и 100 МПа. После деформации растяжением в исходном состоянии обнаружены два муль-тикомпонентных пика при температурах около 250 и 365 К. Показано, что низкотемпературный пик имеет релаксационную природу, в то время как высокотемпературный пик относится к резонансным. Также прове-рено влияние содержания водорода и его распределения на свойства пи-ков внутреннего трения, а именно, на их фон, амплитуду и термическую стабильность. Сформулировано предположение о том, что водород способ-ствует стабилизации вакансий, что следует из экспериментальных иссле-дований наводороженной и сос...

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Lattice defects dominating hydrogen-related failure of metals

Cited by 312 publications

References 40 publications

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

Digital Image Correlation Measurement of Localized Deformation in Carbon Steel in the Presence of Hydrogen

Hydrogen-Induced Effects in Annealed and Prestrained 316L-Type Stainless Steel Studied by Mechanical Spectroscopy

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