Effect of bainite fraction on hydrogen embrittlement of bainite/martensite steel

Jo, Jang Woong; Seo, Hyun Joo; Jung, Byung-In; Choi, Seong-Soo; Lee, Chong Soo

doi:10.1016/j.msea.2021.141226

Cited by 13 publications

(9 citation statements)

References 64 publications

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“…94,95 However, the residual mobile hydrogen remains trapped in reversible trapping sites because of the low activation energy. 96 The presented results suggest that hydrogen embrittlement depends on the microstructure of materials, being significantly higher for bainitic microstructure than for ferritic. The low amount of reversible trapping sites and lower diffusivity could cause the increase in HE resistance in this kind of steel.…”

Section: F I G U R E 6 the Fracture Morphology Of The Fsw Api X70 Ste...mentioning

confidence: 75%

“…Due to higher bonding energy, the hydrogen is not released in irreversible traps at room or low temperatures 94,95 . However, the residual mobile hydrogen remains trapped in reversible trapping sites because of the low activation energy 96 …”

Section: Resultsmentioning

confidence: 99%

“…The presented results suggest that hydrogen embrittlement depends on the microstructure of materials, being significantly higher for bainitic microstructure than for ferritic. The low amount of reversible trapping sites and lower diffusivity could cause the increase in HE resistance in this kind of steel 96 . Furthermore, Wang et al 80 describe that for specimens placed in air for 1 day after hydrogen charging, the diffusible hydrogen could escape from the steel, thus inducing higher impact toughness concerning tested hydrogen charging immediately.…”

Section: Resultsmentioning

confidence: 99%

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The effect of hydrogen on the fracture toughness of friction‐stir welded API 5L X70 pipeline steels

Giarola

Ávila

Cintho

et al. 2022

Fatigue Fract Eng Mat Struct

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The hydrogen embrittlement (HE) leads to severe steel degradation of mechanical properties. The hydrogen atoms diffuse into the steel and get positioned into reversible and irreversible trap sites. The pipe to transport oil and gas needs to be welded to construct long‐distance pipeline projects; thus, friction‐stir welding (FSW) has proven an excellent alternative to joining these pipelines. Therefore, this work assessed and analyzed the influence of hydrogen on the microstructure and fracture toughness of API 5L X70 steel welded by friction‐stir welding. The in‐service conditions were simulated by charging the specimen electrolytically in a 3.5% NaCl water solution with an intensity current of 2 mA·cm−2. According to fracture toughness tests, the base metal (BM) was more affected by hydrogen embrittlement than the friction‐stir zone (SZ), with a fracture toughness reduction of 20% after hydrogen charging. The SZ fracture toughness did not statistically show changes in hydrogen charging by the used times; however, the fracture mechanism changed from ductile to brittle‐like after 4 days of charging. The SZ depicted a better fracture toughness than BM due to the bainitic microstructure, a significant amount of irreversible hydrogen trapping.

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Section: F I G U R E 6 the Fracture Morphology Of The Fsw Api X70 Ste...mentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The effect of hydrogen on the fracture toughness of friction‐stir welded API 5L X70 pipeline steels

Giarola

Ávila

Cintho

et al. 2022

Fatigue Fract Eng Mat Struct

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“…The present study suggests that the lattice H diffusion coefficient in CP steel was higher compared to the DP steels. For CP steel, the bainite promotes hydrogen diffusion [44,78] and in the case of percolate phase, the hydrogen effective diffusivity could be enhanced, as discussed by Fielding et al [79]. Therefore, H diffusion path (percolate phases, metallugical defects) influences the observed diffusion coefficient values of these steels.…”

Section: Discussionmentioning

confidence: 89%

“…Needless to emphasize, the AHSS being multiphase steels with varying amounts of ferrite, martensite, bainite, or austenite are expected to exhibit a complex interaction with the H, influencing its diffusivity, solubility, and distribution within the material [41][42][43][44] and its interaction with dislocation nucleation [45]. Thus, especially in the AHSS, there is a need to understand the influence of microstructure on the H permeation behavior as the material microstructure plays an important role in the H distribution [46] and the mechanical properties [47,48] and the cracking mechanism [49,50].…”

Section: Introductionmentioning

confidence: 99%

Study of Diffusible Behavior of Hydrogen in First Generation Advanced High Strength Steels

Mallick

Mary

Raja

et al. 2021

Metals

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This study deals with microstructural influence on the H permeation behavior of Dual-Phase (DP) and Complex Phase (CP) steels using electrochemical permeation studies. The H diffusion coefficients in DP steels (DP800: 1.65 × 10−10 m2·s−1, DP1000: 1.58 × 10−10 m2·s−1) are half of that found in CP steels (3.07 × 10−10 m2·s−1).The banded microstructure along the specimen thickness and higher C content of the DP led to high H diffusivity of DP steels. The lower total H concentration along with a higher fraction of H was present in the stronger traps in CP steels suggest a better HE resistance of this steel. The H distribution in the specimens was non-uniform, with a higher H concentration speculated near the charging surface.

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Effect of Slow Strain Rates on the Hydrogen Migration and Different Crack Propagation Modes in Pipeline Steel

Peng

Cao

Huang

et al. 2023

steel research int.

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The slow‐strain‐rate test (SSRT) is the most commonly used method for evaluating pipeline steel in service environments. However, to accurately assess the sensitivity of steel to hydrogen, it is necessary to investigate the effect of different strain rates, taking into account microstructure‐influenced hydrogen migration. Herein, a hot‐rolled X70 pipeline steel sheet is investigated by a SSRT at different strain rates with and without synchronous hydrogen charging. The influence of the pearlite content and different strain rates on the hydrogen‐assisted crack propagation and hydrogen diffusion in pipeline steels is discussed. Using scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and hydrogen microprinting, the hydrogen atoms are observed to be easily segregated at the ferrite/pearlite (F/P) interface without external stress. Under loading, a higher strain rate results in lower hydrogen permeation content in steel, penetrating into pearlite and interacting with its internal vacancies, leading to transgranular fracture initiating from pearlite. At a low strain rate, the F/P interface is more vulnerable to hydrogen degradation, leading to intergranular crack mode along the interface and increased tendency to form secondary cracks. Therefore, strain rate–induced crack initiation and propagation characteristics should be considered during the SSRT.

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Effect of bainite fraction on hydrogen embrittlement of bainite/martensite steel

Cited by 13 publications

References 64 publications

The effect of hydrogen on the fracture toughness of friction‐stir welded API 5L X70 pipeline steels

The effect of hydrogen on the fracture toughness of friction‐stir welded API 5L X70 pipeline steels

Study of Diffusible Behavior of Hydrogen in First Generation Advanced High Strength Steels

Effect of Slow Strain Rates on the Hydrogen Migration and Different Crack Propagation Modes in Pipeline Steel

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