Effect of microstructure and temperature on the stress corrosion cracking of two microalloyed pipeline steels in H2S environment for gas transport

Fragiel, A.; Serna, S.; Malo-Tamayo, J. M.; Silva, Pedro; Campillo, B.; Martínez-Martinez, E. A.; Cota, L.; Staia, M.H.; Puchi-Cabrera, E.S.; Pérez, R.

doi:10.1016/j.engfailanal.2019.06.028

Cited by 31 publications

(13 citation statements)

References 40 publications

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“…On the other hand, no high hardness values were particularly measured in the center regions of Steel B. Considering the inverse relationship between the hardness level and HIC resistance [ 47 ], the cause of the higher CAR and much more prominent crack propagation in the mid-thickness region of Steel C, compared to Steel B, is better understood. The detrimental effects by local areas with high hardness in the mid-thickness region overtake the beneficial effect by a high degree of pearlite dispersion in the microstructure of Steel C, resulting in lower resistance to HIC.…”

Section: Resultsmentioning

confidence: 99%

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

et al. 2020

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This study examined the effects of alloying elements (C, Mo) on hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) behaviors of A516-65 grade pressure vessel steel in sour environments. A range of experimental and analytical methods of HIC, SSC, electrochemical permeation, and immersion experiments were used. The steel with a higher C content had a larger fraction of banded pearlite, which acted as a reversible trap for hydrogen, and slower diffusion kinetics of hydrogen was obtained. In addition, a higher hardness in the mid-thickness regions of the steel, due to center segregation, resulted in easier HIC propagation. On the other hand, the steel with a higher Mo content showed more dispersed banded pearlite and a larger amount of irreversibly trapped hydrogen. Nevertheless, the addition of Mo to the steel can deteriorate the surface properties through localized pitting and the local detachment of corrosion products with uneven interfaces, increasing the vulnerability to SSC. The mechanistic reasons for the results are discussed, and a desirable alloy design for ensuring an enhanced resistance to hydrogen assisted cracking (HAC) is proposed.

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Section: Resultsmentioning

confidence: 99%

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

et al. 2020

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“…Концентрация напряжений на питтингах вызывает увеличение локального тока анодного растворения и, следовательно, дополнительную аккумуляцию водорода в стали [30]. Помимо этого, заметное ускорение процесса растворения может возникать за счет образования электрохимической пары феррит-перлит [31].…”

Section: Introductionunclassified

Анализ Влияния Предела Текучести На Коррозионное Растрескивание Под Напряжением Мартенситных И Ферритных Сталей В Кислых Средах

Петров¹,

Разуваева²

2022

Журнал Технической Физики

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To evaluate the effect of yield stress on hydrogen embrittlement (HE) of martensitic and ferritic steels, the effect of hydrogen (H) capture by structural inhomogeneities (hydrogen traps) and the effect of plastic deformation and stress on the mechanism of stress corrosion cracking (SCC) are considered. In the presence of hydrogen, the brittle fracture of high-strength martensitic steels consists of flat areas of intergranular fracture at the initial austenitic grain boundaries and quasi-brittle cracks at the boundaries of martensite blocks. In low-strength steels, brittle fracture manifests itself in the form of transgranular fracture of ferrite grains. The decrease in the characteristics of martensitic steels with an increase in the yield strength occurs due to an increase in the hydrogen concentration at the stage of anodic dissolution (AD) due to the growth of the carbide/matrix interface. The reason for the growth hydrogen concentration in ferritic steels is a large mechanical overstress, an increase in the number of active dissolution centers, the formation of an electrochemical pearlite-ferrite pair, and an increase in surface roughness with increasing deformation. It is concluded that the bell-shaped dependences of the critical stress of the transition from AD to SCC and other characteristics of mechanical tests on magnitude are due to different mechanisms of hydrogen accumulation in martensitic and ferritic steels.

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“…SSC is a type of environmentally assisted cracking phenomenon and proceeds perpendicularly to the loading axis under external load from a steel surface exposed to a sour environment. [1] From previous studies, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] SSC in low alloy steels is regarded as a type of hydrogen embrittlement (HE), and pipeline steels with hardness higher than HRC 22 (equivalent to 550 MPa yield strength) are generally considered to have high SSC susceptibility. [16] Currently, TMCP (thermomechanical-controlled process) low alloy steel that satisfies this hardness constraint is used for the transportation of LP applications.…”

Section: Introductionmentioning

confidence: 99%

“…Many previous studies on SSC have been based on a NACE TM-01-77 compliant 1-bar H 2 S saturated environment or a high-pressure, high-concentration H 2 S environment. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] As H 2 S is well known to act as a catalyst that promotes penetration of hydrogen into steel, [17][18][19][20][21][22] it is reasonable to conclude that SSC in a saturated H 2 S solution or a high-pressure, high-concentration H 2 S environment is a kind of HE phenomenon. However, actual sour environments include many low-concentration H 2 S partial pressure environments.…”

Section: Introductionmentioning

confidence: 99%

Influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H₂S content sour corrosion environment

Samusawa¹,

Izumi²,

Shimamura³

2021

Materials & Corrosion

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The influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H 2 S content sour corrosion environment was investigated. These experiments were conducted with steel for pipelines, and electrochemical methods were used. The results showed that external stress increases the amount of corrosion weight loss and trench depth by promoting the anodic dissolution reaction, and stress concentration was proven to be one of the driving forces for trench formation due to localized corrosion. Based on the experimental findings, the mechanism of trenching was discussed from the viewpoint of promotion of the anodic dissolution reaction by dislocations.

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Effect of microstructure and temperature on the stress corrosion cracking of two microalloyed pipeline steels in H2S environment for gas transport

Cited by 31 publications

References 40 publications

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

Анализ Влияния Предела Текучести На Коррозионное Растрескивание Под Напряжением Мартенситных И Ферритных Сталей В Кислых Средах

Influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H₂S content sour corrosion environment

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Effect of microstructure and temperature on the stress corrosion cracking of two microalloyed pipeline steels in H2S environment for gas transport

Cited by 31 publications

References 40 publications

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

Анализ Влияния Предела Текучести На Коррозионное Растрескивание Под Напряжением Мартенситных И Ферритных Сталей В Кислых Средах

Influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H2S content sour corrosion environment

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Influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H₂S content sour corrosion environment