Hydrogen interaction with ferrite/cementite interface: ab initio calculations and thermodynamics

Мирзоев, А. А.; Верховых, А.В.; Okishev, K. Yu.; Мирзаев, Д. А.

doi:10.1080/00268976.2017.1406161

Cited by 10 publications

(9 citation statements)

References 36 publications

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“…The F/P interface also includes the F/C interface and crystal boundaries of ferrite with different orientations. [ 36 ] Based on the mismatch between ferrite and cementite, [ 32 ] and the wedge‐shaped matching between the ferrite matrix and lamellar C/F in pearlite, the F/P interface is classified as a high‐energy incoherent interface, which provides numerous hydrogen traps. According to the hydrogen‐microprinting results shown in Figure 4, without external stress, the pearlite phase and F/P interfaces have obvious segregation effects on the hydrogen atoms.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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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show abstract

“…Within the literature, there are significant deviations in the classification of these traps. Depending on the specific lamellae spacing and C content, widely varying trapping energies between 11 and 80 kJ mol are reported [42][43][44], resulting in a mixed classification as both shallow and deep traps. However, it is reported that introducing pearlite into a ferritic-bainitic dual-phase steel resulted in improved resistance to HE [45].…”

Section: Cavitiesmentioning

confidence: 99%

Local Hydrogen Measurements in Multi-Phase Steel C60E by Means of Electrochemical Microcapillary Cell Technique

Jürgensen,

Pohl

2023

Metals

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By utilizing hydrogen as an eco-friendly energy source, many metals are exposed to gaseous (pressurized) hydrogen. High-strength steels with an ultimate tensile strength of 800 MPa and above are especially susceptible to hydrogen-induced fracturing, also referred to as hydrogen embrittlement (HE). Both the microstructure and phase fractions within the steel, as well as lattice distortion, carbide precipitation, residual stress, etc., significantly affect the susceptibility to HE. Among others, one important cause for this observation is found in the locally varying hydrogen solubility within different microstructural phases such as martensite, bainite, pearlite, and ferrite. Both a thorough understanding of the HE mechanisms and taking countermeasures in the form of alloying design require an accurate analysis of local diffusive hydrogen concentrations within the material. Thermal analysis methods such as Thermal Desorption Mass Spectrometry only display an integral hydrogen concentration throughout the whole sample volume. To analyze the local diffusive hydrogen concentration, novel measuring techniques with a high special resolution must therefore be utilized. The current research presents first-of-its-kind hydrogen analyses by means of the electrochemical microcapillary cell. Using a 10 µm tip opening diameter allows for conducting local diffusive hydrogen measurements within individual grains of multi-phase carbon steel C60E (1.1221). The results confirm that hydrogen is distributed heterogeneously within multi-phase steels. Considering the individual phase fractions and the respective local diffusive hydrogen concentrations, a total diffusive hydrogen concentration can be calculated. The obtained value is in good agreement with reference thermal hydrogen analyses. Our results suggest that electrochemical microcapillary cell measurements offer great potential for further studies, which will provide a better understanding of HE and local hydrogen accumulation.

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“…In this case, on the fracture surface, in the area of crack initiation, we observe characteristic features known as the fish-eye crack [11,16]. Nowadays, models of hydrogen behaviour at the interface of the iron cell and iron carbide already exist [17,18]. These models are based on the ab initio method, where we model the behaviour at the level of atoms in the crystal lattice (Bravais lattice) [18].…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, models of hydrogen behaviour at the interface of the iron cell and iron carbide already exist [17,18]. These models are based on the ab initio method, where we model the behaviour at the level of atoms in the crystal lattice (Bravais lattice) [18].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Embrittlement and its Effect on Fatigue Life of Nitrided Steel in Gigacycle Fatigue: Analysis and Modelling

Major

2022

J. Phys.: Conf. Ser.

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This paper deals with the effect of hydrogen embrittlement on the fatigue life of steels. This phenomenon is typical for the gigacycle fatigue region, but we also encounter it in surface-treated materials. in which a subsurface crack initiation has occurred. In samples in which the fracture is affected by the presence of hydrogen embrittlement, subsurface fatigue crack initiation occurs. In this work we observe the change in toughness and local elastic modulus depending on the hydrogen diffusion of hydrogen over time.

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Hydrogen interaction with ferrite/cementite interface: ab initio calculations and thermodynamics

Cited by 10 publications

References 36 publications

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

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

Local Hydrogen Measurements in Multi-Phase Steel C60E by Means of Electrochemical Microcapillary Cell Technique

Hydrogen Embrittlement and its Effect on Fatigue Life of Nitrided Steel in Gigacycle Fatigue: Analysis and Modelling

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