Mechanism of the Hydrogen Cracking of Metals and Alloys, Part II (Review)

Sergeev, N. N.; Sergeev, A. N.; Кутепов, С. Н.; Колмаков, А. Г.; Гвоздев, А. Е.

doi:10.1134/s2075113319010271

Cited by 8 publications

(11 citation statements)

References 54 publications

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“…This may be due to the fact that under these test conditions, there is a sharp reduction in the incubation period and the stage of development of microcracks, as well as the origin and development of many disoriented microcracks, which prevents them from merging into the main crack and thereby increases the pre-fracture time. Hydrogen in the process of brittle fracture plays the role of a catalyst for these processes, leading to a sharp decrease in the magnitude of micro-stresses necessary for the promotion of microcracks, thereby facilitating cracking, which is consistent with the data [17][18][19][20][21].…”

Section: Influence Of Cathodic Polarizationsupporting

confidence: 84%

“…Usually, increasing the concentration of acidic media increases the tendency of steel to brittle fracture [17][18][19][20]. Water solutions of hydrochloric, sulfuric, and other acids with various additives (flood stimulators), as well as solutions containing hydrogen sulfide are used mainly as flood-reducing media [17][18][19][20]. To determine the effect of the concentration of electrolyte solutions on the sensitivity of steel to corrosion fracture, samples made of 80С (80C) steel were tested in aqueous solutions of H 2 SO 4 and HCl of different concentrations at the same level of tensile stresses σ Э = 0.6 σ B MPa.…”

Section: Research Materials and Methodsmentioning

confidence: 99%

“…In accordance with a certain pre-fracture time characterizing each stress level, full-scale samples made of steel 20ГС2 (20GS2) were subjected to a complex and separate influence of various factors in special corrosion chamberscorrosion medium, tensile stresses, cathodic polarization from an external current source at different holding times up to the pre-fracture [17][18][19]. Also, in the process of holding steel 20ГС2 (20GS2) in a corrosive medium (in the study of the process of stress corrosion cracking), the temperature of the medium was changed.…”

Section: Research Materials and Methodsmentioning

confidence: 99%

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On the Influence of Internal and External Factors on the Processes of Corrosion-Mechanical Fracture of High-Strength Low-Alloy Steels

et al. 2021

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The article studies the influence of internal and external factors on the process of corrosion-mechanical fracture. It is shown that depending on the conditions of hydrogen charging (temperature and chemical composition of the corrosive medium, type of polarization), the mechanical properties of low-alloy steels change dramatically during the initial period of the experiment. With further increase in the holding time in a corrosive medium without polarization, there is no significant change in mechanical properties. It was found that an increase in the level of applied tensile stresses leads to a reduction in the incubation period of microcracks during hydrogen cracking. It was found that the sensitivity of low alloy steels to cracking is largely determined by the relaxation ability of the structure-the relaxation of residual peak micro-stresses localized at the grain boundaries and substructure boundaries reduces the sensitivity to corrosion-mechanical fracture.

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Section: Influence Of Cathodic Polarizationsupporting

confidence: 84%

Section: Research Materials and Methodsmentioning

confidence: 99%

Section: Research Materials and Methodsmentioning

confidence: 99%

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On the Influence of Internal and External Factors on the Processes of Corrosion-Mechanical Fracture of High-Strength Low-Alloy Steels

et al. 2021

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“…15,18,19 Several viable mechanisms have been proposed to give insight into this phenomenon, including "hydrogen-enhanced local plasticity" (HELP), "hydrogen-enhanced decohesion" (HEDE), "hydrogenenhanced strain-induced vacancy" formation (HESIV), hydride formation, and "adsorption-induced dislocation emission" (AIDE). [20][21][22][23][24] Out of the proposed HE mechanisms, the HELP and HEDE models of HE mechanisms are mostly accepted.…”

Section: Introductionmentioning

confidence: 99%

The fatigue crack growth behavior of hydrogenated 9Cr‐1Mo steel: An experimental and numerical study

Bharati,

Maity,

Singh

et al. 2024

Fatigue Fract Eng Mat Struct

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This research investigates the fatigue crack evolution in P91 steel through experiments and extended finite element method (XFEM) simulation for as‐received and hydrogenated conditions. Hydrogen pre‐charging is performed using a constant current electrochemical method in 1 M sulfuric acid solution. The study compares the experimental fatigue crack growth rate (FCGR) of hydrogenated and as‐received conditions and employs an XFEM simulation to replicate FCGR. The results of the experiments reveal an increased FCGR in hydrogenated specimens. Fracture surface analysis confirms the co‐occurrence of the “hydrogen‐enhanced localized plasticity” (HELP) and “hydrogen‐enhanced decohesion” (HEDE) mechanism (HELP+HEDE, HEDE>HELP). The simulation results closely align with the experimental findings, validating the model's accuracy. Consequently, these findings are the basis for proposing a damage tolerance approach‐based numerical algorithm. This algorithm allows the prediction of component integrity by considering a known crack length. Furthermore, fracture toughness (KIQ) was experimentally evaluated to enhance the understanding of the material's mechanical properties.

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“…Hydrogen difusion through Fe alloy results in several cracks, sulfde stress corrosion cracking, and susceptibility to hydrogen embrittlement. Previous works have studied the hydrogen embrittlement (HE) in iron bases alloys, and several mechanisms have been proposed [7,8]. However, the efect of hydrogen on the mechanical properties on behavior depends on diferent conditions such as loading, metallurgical structure, strength level, strain rate, type of charging, and charging current density [9].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Boride Coatings on AISI 8620 Steels without and with Hydrogen Permeation

Ruiz

Bustos

Ramirez³

et al. 2022

Advances in Materials Science and Engineering

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The present work studied the characterization of boriding coatings without and with exposed hydrogen permeation on AISI 8620 through microstructure and mechanical behavior. A dehydrated paste pack process was carried out for the formation of boride coatings on AISI 8620 at 1173, 1223, and 1273 K for 6 h of exposure time for each temperature. After boronizing, hydrogen was introduced into the borided steels by in situ cathodic charging using an H2SO4 acid electrolyte. Specimens borided without and with hydrogen were characterized by scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction. The experimental techniques of the Vickers microhardness and three-point bending were used. As a result, the hydrogen diffusion on steel AISI 8620 borided shows a significant increase in microhardness. Furthermore, three-point bend tests showed an increased strength on 8620 steel borided. However, the ductility and strength value on 8620 steel borided surfaces presented a drastic reduction due to hydrogen permeation. The results revealed that the borided coatings provided strength and reduced the hydrogen embrittlement index on AISI 8620 borided.

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Mechanism of the Hydrogen Cracking of Metals and Alloys, Part II (Review)

Cited by 8 publications

References 54 publications

On the Influence of Internal and External Factors on the Processes of Corrosion-Mechanical Fracture of High-Strength Low-Alloy Steels

On the Influence of Internal and External Factors on the Processes of Corrosion-Mechanical Fracture of High-Strength Low-Alloy Steels

The fatigue crack growth behavior of hydrogenated 9Cr‐1Mo steel: An experimental and numerical study

Characterization of Boride Coatings on AISI 8620 Steels without and with Hydrogen Permeation

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