Pearlite-driven surface-cracking and associated loss of tensile ductility in plain-carbon steels under exposure to high-pressure gaseous hydrogen

Ogawa, Yuhei; Hino, Masaki; Nakamura, Masami; Matsunaga, Hisao

doi:10.1016/j.ijhydene.2020.11.137

Cited by 30 publications

(7 citation statements)

References 89 publications

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“…In the aforementioned experiment, Dmytrakh et al found that dimples still remain the dominant feature of fracture surface when H concentration is low; quasi-cleavage was observed only when the concentration of H was high enough. In an in situ H charging tensile experiment on a tensile specimen made of pipeline steel, H-induced quasi-cleavage was observed in the region close to the notch surface; moving away from the notch root to the centre of the specimen, small dimples became visible even under low magnification; ductile fracture features with large dimples were observed at the centre of the specimen. It is hypothesized that the transition is related to the nonhomogeneous distribution of H. The concentration of H is the maximum in the region close to the notch root and decreases towards the center.…”

Section: Knowledge Base About Hementioning

confidence: 97%

“…In the aforementioned experiment, Dmytrakh et al 750 found that dimples still remain the dominant feature of fracture surface when H concentration is low; quasi-cleavage was observed only when the concentration of H was high enough. In an in situ H charging tensile experiment on a tensile specimen made of pipeline steel, 755 H-induced quasi-cleavage was observed in the region close to the notch surface; moving away from the notch root to the centre of the specimen, small dimples became visible even under low magnification; ductile fracture A single damage process and HE mechanism may not be sufficient to account for the fracture mode transition and the Sshaped degradation pattern. A viable explanation for the phenomena is a transition from the microvoid process when H is absent, to the HELP mechanism in the range of low concentrations and to the HEDE mechanism when the concentration is high enough.…”

Section: Chemical Reviewsmentioning

confidence: 99%

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Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Yu,

Díaz,

et al. 2024

Chem. Rev.

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Hydrogen is considered a clean and efficient energy carrier crucial for shaping the net-zero future. Large-scale production, transportation, storage, and use of green hydrogen are expected to be undertaken in the coming decades. As the smallest element in the universe, however, hydrogen can adsorb on, diffuse into, and interact with many metallic materials, degrading their mechanical properties. This multifaceted phenomenon is generically categorized as hydrogen embrittlement (HE). HE is one of the most complex material problems that arises as an outcome of the intricate interplay across specific spatial and temporal scales between the mechanical driving force and the material resistance fingerprinted by the microstructures and subsequently weakened by the presence of hydrogen. Based on recent developments in the field as well as our collective understanding, this Review is devoted to treating HE as a whole and providing a constructive and systematic discussion on hydrogen entry, diffusion, trapping, hydrogen–microstructure interaction mechanisms, and consequences of HE in steels, nickel alloys, and aluminum alloys used for energy transport and storage. HE in emerging material systems, such as high entropy alloys and additively manufactured materials, is also discussed. Priority has been particularly given to these less understood aspects. Combining perspectives of materials chemistry, materials science, mechanics, and artificial intelligence, this Review aspires to present a comprehensive and impartial viewpoint on the existing knowledge and conclude with our forecasts of various paths forward meant to fuel the exploration of future research regarding hydrogen-induced material challenges.

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Section: Knowledge Base About Hementioning

confidence: 97%

Section: Chemical Reviewsmentioning

confidence: 99%

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Yu,

Díaz,

et al. 2024

Chem. Rev.

View full text Add to dashboard Cite

show abstract

“…Under this lower strain rate, hydrogen atoms have sufficient time to migrate into the F/P interfaces because of their strong trapping capability. [20,22] Consequently, the number of microcracks increased and tended to nucleate at the F/P interface. [22,25] However, cracks still exist due to the inner regions of pearlite, as depicted in Figure 10b, which are supposed to be induced by the strain-induced hydrogen-vacancy interaction mechanism.…”

Section: Co-effect Of Strain Rates and Hydrogen Charging On The Mecha...mentioning

confidence: 99%

“…[20,22] Consequently, the number of microcracks increased and tended to nucleate at the F/P interface. [22,25] However, cracks still exist due to the inner regions of pearlite, as depicted in Figure 10b, which are supposed to be induced by the strain-induced hydrogen-vacancy interaction mechanism.…”

Section: Co-effect Of Strain Rates and Hydrogen Charging On The Mecha...mentioning

confidence: 99%

“…The internal ferrite/cementite (F/C) lamellae of pearlite and ferrite/pearlite (F/P) interfaces affect the hydrogen diffusion/trapping and crack initiation in the material. [19][20][21][22] Ogawa et al [22] reported that pearlite grains on sample surfaces serve as the preferential origins of hydrogen-induced microcracks. Kim et al [23,24] experimentally determined a binding energy of 66.3 kJ mol À1 on the F/C interface in pearlite and hydrogen, making it a strong hydrogen capture site, that is, irreversible hydrogen trap, that hinders the free diffusion of hydrogen atoms in the material.…”

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confidence: 99%

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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 different parameters on hydrogen affected fatigue failure in pipeline steels

Mohtadi-Bonab

2022

Engineering Failure Analysis

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Pearlite-driven surface-cracking and associated loss of tensile ductility in plain-carbon steels under exposure to high-pressure gaseous hydrogen

Cited by 30 publications

References 89 publications

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

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

Effect of different parameters on hydrogen affected fatigue failure in pipeline steels

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