Characteristic Dependency of Hydrogen-Affected Fatigue Crack Growth and Crack Tip Plasticity on Low Loading Frequency in α-Iron

Shinko, Tomoki; Hénaff, Gilbert; Halm, Damien; Guiffard, Benoît; Bahsoun, Hadi

doi:10.1007/s11661-020-05860-8

Cited by 6 publications

(8 citation statements)

References 56 publications

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“…Several authors have also reported the influence of hydrogen on the fatigue crack growth rate [ 13 , 14 , 15 ]. The effect of hydrogen on the fatigue crack growth performance of a pure iron steel was investigated by T. Shinko et al [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

The Positive Role of Nanometric Molybdenum–Vanadium Carbides in Mitigating Hydrogen Embrittlement in Structural Steels

et al. 2021

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The influence of hydrogen on the fracture toughness and fatigue crack propagation rate of two structural steel grades, with and without vanadium, was evaluated by means of tests performed on thermally precharged samples in a hydrogen reactor at 195 bar and 450 °C for 21 h. The degradation of the mechanical properties was directly correlated with the interaction between hydrogen atoms and the steel microstructure. A LECO DH603 hydrogen analyzer was used to study the activation energies of the different microstructural trapping sites, and also to study the hydrogen eggresion kinetics at room temperature. The electrochemical hydrogen permeation technique was employed to estimate the apparent hydrogen diffusion coefficient. Under the mentioned hydrogen precharging conditions, a very high hydrogen concentration was introduced within the V-added steel (4.3 ppm). The V-added grade had stronger trapping sites and much lower apparent diffusion coefficient. Hydrogen embrittlement susceptibility increased significantly due to the presence of internal hydrogen in the V-free steel in comparison with tests carried out in the uncharged condition. However, the V-added steel grade (+0.31%V) was less sensitive to hydrogen embrittlement. This fact was ascribed to the positive effect of the precipitated nanometric (Mo,V)C to alleviate hydrogen embrittlement. Mixed nanometric (Mo,V)C might be considered to be nondiffusible hydrogen-trapping sites, in view of their strong hydrogen-trapping capability (~35 kJ/mol). Hence, mechanical behavior of the V-added grade in the presence of internal hydrogen was notably improved.

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Section: Introductionmentioning

confidence: 99%

The Positive Role of Nanometric Molybdenum–Vanadium Carbides in Mitigating Hydrogen Embrittlement in Structural Steels

et al. 2021

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“…To investigate the validity of the criterion (PH2 × f) 1/2 for the present results, the relationship between the FCGRs in hydrogen and (PH2 × f) 1/2 is shown in Figure 5 [27,29]. This diagram clearly demonstrates that the onsets of FCGR enhancement by increasing loading frequency at both hydrogen gas pressures occur at the same value of (PH2 × f) 1/2 ~ 2 (MPa×s -1 ) 1/2 .…”

Section: Dependency Of Hafcg On Loading Frequencymentioning

confidence: 66%

“…As regards the influence of loading frequency f on the FCGR in the highly-accelerated regime, the previous experimental study [29] clarified the relationship between the FCGR and f as presented by Figure 5 for each result of FCG test (from [29]). the magnitude of FCGR enhancement in the accelerated regime increases by decreasing f until a certain value;…”

Section: Dependency Of Hafcg On Loading Frequencymentioning

confidence: 83%

“…This result indicates that the hydrogen gradient (PH2 × f) 1/2 is likely a valid criterion for the onset of HAFCGR enhancement of the present case in Armco iron. MPa×m 1/2 (from [27,29]) . Yoshikawa et al [92,93] also observed that a clear reduction of the extent of plastic deformation near the crack tip occurred during the enhanced FCG with a high level of hydrogen gradient.…”

Section: Dependency Of Hafcg On Loading Frequencymentioning

confidence: 99%

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Controlling factors and mechanisms of fatigue crack growth influenced by high pressure of gaseous hydrogen in a commercially pure iron

Shinko

Halm

Guiffard

et al. 2021

Theoretical and Applied Fracture Mechanics

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“…[6][7][8][9] There is no doubt about the influence of mechanical factors on the CFCG rate. The amplitude of fatigue load, the magnitude of average stress, stress ratio, residual stress, loading frequency, loading waveform and other mechanical factors [10][11][12][13][14] have different effects on it. In 1987, Matlock et al [15] researched the factors affecting the CFCG characteristics of the welded joints of marine engineering structures.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Fatigue-Cracking Behaviors of Low Alloy Steels in Seawater for Offshore Engineering Structures

Liu

et al. 2022

Metall Mater Trans A

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The fatigue crack growth (FCG) properties of offshore engineering structural steel DH36Z35 were studied in air and an artificial seawater environment. Results show that the FCG rate in seawater is up to 134.5 pct higher than in air. The test results of FCG rate in air and seawater at different frequencies show that FCG in seawater is accelerated compared with that in air at frequencies below 7 Hz. The lower the frequency, the more obvious the acceleration. It is found that the larger the seawater flow rate, the larger the corrosion fatigue crack growth (CFCG) rate. Compared with static seawater, when the flow rate reaches 180 L/h, the average increase of CFCG is about 55.6 pct. In addition, the mechanism by which corrosion accelerates fatigue crack propagation is analyzed from three different perspectives: corrosion product morphology, crack propagation path and corrosion electrochemistry.

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Characteristic Dependency of Hydrogen-Affected Fatigue Crack Growth and Crack Tip Plasticity on Low Loading Frequency in α-Iron

Cited by 6 publications

References 56 publications

The Positive Role of Nanometric Molybdenum–Vanadium Carbides in Mitigating Hydrogen Embrittlement in Structural Steels

The Positive Role of Nanometric Molybdenum–Vanadium Carbides in Mitigating Hydrogen Embrittlement in Structural Steels

Controlling factors and mechanisms of fatigue crack growth influenced by high pressure of gaseous hydrogen in a commercially pure iron

Corrosion Fatigue-Cracking Behaviors of Low Alloy Steels in Seawater for Offshore Engineering Structures

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