The mechanism of hydrogen-facilitated anodic-dissolution-type stress corrosion cracking: theories and experiments

Mao, Scott X.; Gu, Bill; Wu, Ning; Li, Qiao

doi:10.1080/01418610108216638

Cited by 25 publications

(10 citation statements)

References 20 publications

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“…Qiao et al [20,27,28] pointed out that the SCC behavior of hydrogen-charged ASS could be described by the HFAD model. As predicted by this model, the anodic dissolution at the crack tip increases markedly as a result of the interaction between the stress field ahead of crack tip and the lattice expansion produced by dissolved hydrogen atoms.…”

Section: Hydrogenmentioning

confidence: 98%

Evaluation of stress corrosion cracking susceptibility of stainless steel 304L with surface nanocrystallization by small punch test

Bai

Chen

Guan

2013

Materials Science and Engineering: A

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Section: Hydrogenmentioning

confidence: 98%

Evaluation of stress corrosion cracking susceptibility of stainless steel 304L with surface nanocrystallization by small punch test

Bai

Chen

Guan

2013

Materials Science and Engineering: A

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“…Experimental evidence has indicated that both anodic dissolution and dissolved hydrogen in a steel play important roles in near-neutral pH SCC. [11,[14][15][16][17] Although experimental observations on the impact of plastic prestrain or cold work on the anodic dissolution rate of pipeline steels in simulated near-neutral pH groundwater are contradictory, [16,24,29] thermodynamic analysis has indicated that such an effect is limited. [16] Plastic prestrain will introduce more crystalline defects, such as vacancies and dislocations.…”

Section: Effect Of Microstructure and Yield Strength On Scc Suscepmentioning

confidence: 99%

“…[13] These cracks are initially not visible to the naked eye and are most commonly found in ''colonies,'' in which all cracks are positioned in the same direction. Over a period of years, small cracks may propagate with certain mechanisms related to anodic dissolution or hydrogen embrittlement [14][15][16][17] and may coalesce into large cracks. [10,12] Since SCC develops slowly, it may exist in pipelines for many years without causing problems.…”

Section: Introductionmentioning

confidence: 99%

Near-Neutral pH Stress Corrosion Cracking Susceptibility of Plastically Prestrained X70 Steel Weldment

Luo

Ivey

2010

Metall Mater Trans A

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The application of strain-based design for pipelines requires comprehensive understanding of the postyield mechanical behavior of materials. In this article, the impact of plastic prestrain on near-neutral pH stress corrosion cracking (SCC) susceptibility of welded X70 steel was investigated with a slow strain rate tensile (SSRT) test. Generally, plastic prestrain reduces the SCC resistance in various welded zones. The SCC susceptibility of the test materials can be put in the following order: heat-affected zone (HAZ) > weld metal (WM) > base metal (BM). Fractographic analysis indicates that there are two cracking modes, mode I and mode II, during SSRT tests. Mode I cracks propagate along the direction perpendicular to the maximum tensile stress, and mode II cracks lie in planes roughly parallel to the plane where the maximum shear exists. The SCC of the BM is governed by mode I cracking and fracture of the HAZ, and the WM is dominated by mode II cracking. Damage analysis shows that the detrimental impact of plastic prestrain on the residual SCC resistance cannot be evaluated with the linear superposition model. A plastic prestrain sensitivity, a material constant independent of plastic prestrain, is proposed to characterize the susceptibility of SCC resistance to plastic prestrain, and it increases with the SCC susceptibility of the steels. The enhanced SCC susceptibility caused by plastic prestrain may be related to an increase in yield strength. The correlation of the ratio of the reduction in area in NS4 solution to that in air (RA SCC /RA air ) with the yield strength is microstructure dependent.

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“…To interpret the phenomenon of hydrogen-promoted anodic dissolution observed in stainless steels, a hydrogen-facilitated anodic dissolution (HFAD) model was proposed on the basis of thermodynamic analysis [2,21,22]. Theoretically, the HFAD model is only applicable to formulate the anodic dissolution kinetics in the active state.…”

Section: Introductionmentioning

confidence: 99%

“…H 0 Þ is the most common cathodic halfreaction in localized corrosion processes of metals. A fraction of generated hydrogen atoms diffuses into the metal and concentrates around a crack tip via stress-assisted diffusion [1][2][3]. Numerous mechanisms have been proposed to explain stress corrosion cracking (SCC) behaviors but none are able to interpret various features of SCC [4,5].…”

Section: Introductionmentioning

confidence: 99%

Role of hydrogen in stress corrosion cracking of austenitic stainless steels

Luo

et al. 2010

Philosophical Magazine

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Effects of hydrogen charging on the stress corrosion cracking (SCC) behavior of 304 and 310 stainless steels under sustained load were investigated in boiling 42% MgCl 2 solution. The cracking was accelerated by the incorporation of hydrogen into the steel without altering the crack growth mechanism. The fact that the active dissolution is almost unaffected by the hydrogen charging and tensile stress indicates that the phenomenon of hydrogen-promoted SCC is unlikely a result of hydrogen-facilitated active dissolution. In contrast, hydrogen significantly promotes anodic dissolution in the potential range where the active-to-passive transition occurs. The electrochemical noise detected in the SCC process implies that the crack propagation process is discontinuous and hydrogen charging can raise the frequency of film breakdown at the crack tip. These observations suggest that the hydrogen-promoted SCC may result from the hydrogeninduced passivity degradation.

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The mechanism of hydrogen-facilitated anodic-dissolution-type stress corrosion cracking: theories and experiments

Cited by 25 publications

References 20 publications

Evaluation of stress corrosion cracking susceptibility of stainless steel 304L with surface nanocrystallization by small punch test

Evaluation of stress corrosion cracking susceptibility of stainless steel 304L with surface nanocrystallization by small punch test

Near-Neutral pH Stress Corrosion Cracking Susceptibility of Plastically Prestrained X70 Steel Weldment

Role of hydrogen in stress corrosion cracking of austenitic stainless steels

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