Hydrogen Trapping in Some Automotive Martensitic Advanced High‐Strength Steels

Venezuela, Jeffrey; Zhou, Qingjun; Liu, Qinglong; Zhang, Mingxing; Atrens, Andrej

doi:10.1002/adem.201700468

Cited by 59 publications

(41 citation statements)

References 82 publications

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“…This is in good agreement with other works. Martensite was reported to significantly affect the permeation rate . High hydrogen solubility and low diffusivity in martensitic steels was linked to a large network of dislocations and interfaces between martensite laths .…”

Section: Discussionmentioning

confidence: 99%

“…Hadžipašić et al highlighted the role of dislocations and ferrite/martensite grain boundaries as reversible trapping sites in DP steel. It was shown by Venezuela et al that hydrogen diffusion coefficient decreases with an increasing amount of martensite in martensitic AHSSs due to a higher dislocation density . Moli‐Sanchez et al demonstrated that enhanced reversible trapping by dislocations in tempered martensitic AHSSs leads to decreasing hydrogen diffusivity and increasing concentration of diffusible hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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The effect of microstructure on hydrogen permeability of high strength steels

Rudomilova

Prošek

Salvetr

et al. 2019

Materials & Corrosion

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Hydrogen diffusivity and trapping have been studied in two advanced high strength steel grades and model samples using electrochemical permeation test. Microstructures of CP1000 and DP1000 steels consist of ferrite, martensite and a small fraction of retained austenite. In addition, bainite is present in CP1000. Model phases with predominance of a particular phase have been prepared by specific heat treatment. DP1000 has shown the lowest diffusivity among all materials, while ferritic model sample has shown the highest. Differences in hydrogen diffusion coefficient values are linked to trapping microstructural characteristics and grain size. K E Y W O R D Shydrogen-induced cracking, hydrogen permeability, steel

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of microstructure on hydrogen permeability of high strength steels

Rudomilova

Prošek

Salvetr

et al. 2019

Materials & Corrosion

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“…Hydrogen often exists in steels as either diffusing hydrogen or trapped hydrogen. The trapped hydrogen is further divided into reversible hydrogen and irreversible hydrogen . The irreversible hydrogen trapping sites include non‐metallic inclusions, precipitates, micro‐voids, large‐angle grain boundaries, etc .…”

Section: Introductionmentioning

confidence: 99%

Effect of Submicron‐Scale MnS Inclusions on Hydrogen Trapping and HIC Susceptibility of X70 Pipeline Steels

Peng

Liu

Huang

et al. 2018

steel research int.

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In this work, the non‐metallic inclusions contained in a trial X70 pipeline steels are characterized by optical microscopy, scanning electron microscopy, energy‐dispersive X‐ray spectrum, and transmission electron microscopy. Statistical analysis is conducted to summarize the size and shape of the inclusions. The hydrogen trapping and the resulting hydrogen‐induced cracking (HIC) susceptibility of the steels are tested. Density functional theory is used to calculate the binding energy of hydrogen at MnS inclusions, and the impact of MnS inclusions on hydrogen trapping and the HIC susceptibility is evaluated. It is found that the majority of submicron scale inclusions are MnS, which serve as irreversible hydrogen traps. The content of the trapped hydrogen can be effectively decreased by controlling the size of MnS inclusions below submicron scale and distributing the inclusions uniformly in the steel. As a result, the susceptibility of the steel to HIC is reduced.

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“…The theoretical curve for a diffusion transient is given by [4,5,15,[18][19][20]22,123,136,137]: Figure 4. A succession of hydrogen permeation transients were measured with increasing and decreasing hydrogen fugacity, by charging at various potentials in 0.1 M NaOH solution, for pure Fe hydrogen pre-charged at −1.500 V Ag/AgCl in 0.1 M NaOH solution for 48 h to achieve steady state surface conditions on the input side.…”

Section: Permeation Cellmentioning

confidence: 99%

“…Figure 1 illustrates the permeation cell [4,86], which is widely used [19,20,22,23,[117][118][119][120][121][122][123][124][125][126][127][128][129][130][131][132][133][134], and was used in this research project. Hydrogen is produced by the applied cathodic potential on the left hand side of the specimen, by the electrochemical cell on the left hand side of the specimen.…”

Section: Permeation Cellmentioning

confidence: 99%

Influence of Hydrogen on Steel Components for Clean Energy

Atrens

Liu

Tapia-Bastidas

et al. 2018

CMD

Self Cite

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The influence of hydrogen on the mechanical properties of four, medium-strength, commercial, quenched-and-temped steels has been studied using the linearly increasing stress test (LIST) combined with cathodic hydrogen charging. The relationship was established between the equivalent hydrogen pressure and the hydrogen charging overpotential during cathodic hydrogen charging, though the use of electrochemical permeation experiments and thermal desorption spectroscopy. The cathodic hydrogen charging conditions were equivalent to testing in gaseous hydrogen at hydrogen fugacities of over a thousand bar. Under these hydrogen-charging conditions, there was no effect of hydrogen up to the yield stress. There was an influence of hydrogen on the final fracture, which occurred at the same stress as for the steels tested in air. The influence of hydrogen was on the details of the final fracture. In some cases, brittle fractures initiated by hydrogen, or DHF: Decohesive hydrogen fracture, initiated the final fracture of the specimen, which was largely by ductile micro-void coalescence (MVC), but did include some brittle fisheye fractures. Each fisheye was surrounded by MVC. This corresponds to MF: Mixed fracture, wherein a hydrogen microfracture mechanism (i.e., that producing the fisheyes) competed with the ductile MVC fracture. The fisheyes were associated with alumina oxide inclusion, which indicated that these features would be less for a cleaner steel. There was no subcritical crack growth. There was essentially no influence of hydrogen on ductility for the hydrogen conditions studied. At applied stress amplitudes above the threshold stress, fatigue initiation, for low cycle fatigue, occurred at a lower number of cycles with increasing hydrogen fugacity and increasing stress amplitude. This was caused by a decrease in the fatigue initiation period, and by an increase in the crack growth rate. In the presence of hydrogen, there was flat transgranular fracture with vague striations with some intergranular fracture at lower stresses. Mechanical overload occurred when the fatigue crack reached the critical length. There was no significant influence of hydrogen on the final fracture.

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Hydrogen Trapping in Some Automotive Martensitic Advanced High‐Strength Steels

Cited by 59 publications

References 82 publications

The effect of microstructure on hydrogen permeability of high strength steels

The effect of microstructure on hydrogen permeability of high strength steels

Effect of Submicron‐Scale MnS Inclusions on Hydrogen Trapping and HIC Susceptibility of X70 Pipeline Steels

Influence of Hydrogen on Steel Components for Clean Energy

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