Hydrogen trapping in some advanced high strength steels

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

doi:10.1016/j.corsci.2016.05.046

Cited by 116 publications

(67 citation statements)

References 43 publications

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“…Traps are usually divided into two types: reversible and irreversible trapping sites depending on their binding energy. Despite the fact that some value of energy (60 kJ/mol) is being sometimes reported to separate reversible and irreversible trapping sites, their properties form a continuum in view of the binding energy and the probability of hydrogen release. Furthermore, reversible character of trapping sites is dependent on the temperature and increases with increasing temperature .…”

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 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: 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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“…Packing distance between atoms affects diffusion speed and saturation limits. Extra space from dislocations, voids, and grain boundaries can be both traps and pathways for diffusing hydrogen [9], [11], [20]. Austenite has a higher hydrogen solubility limit but a slower diffusion rate than ferrite or martensite, making it an effective hydrogen trap [5], [20]- [25].…”

Section: Hydrogen Diffusion In Ahssmentioning

confidence: 99%

“…Extra space from dislocations, voids, and grain boundaries can be both traps and pathways for diffusing hydrogen [9], [11], [20]. Austenite has a higher hydrogen solubility limit but a slower diffusion rate than ferrite or martensite, making it an effective hydrogen trap [5], [20]- [25]. Recent research has indicated that crystalline orientations have an effect on hydrogen diffusion rates [26], and resistance to HE [12].…”

Section: Hydrogen Diffusion In Ahssmentioning

confidence: 99%

Microstructural evaluation of hydrogen embrittlement and successive recovery in advanced high strength steel

Allen

Nelson

2019

Journal of Materials Processing Technology

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Advanced high strength steels (AHSS) have high susceptibility to hydrogen embrittlement, and are often exposed to hydrogen environments in processing. In order to study the embrittlement and recovery of steel, tensile tests were conducted on two different types of AHSS over time after hydrogen charging. Concentration measurements and hydrogen microprinting were carried out at the same time steps to visualize the hydrogen behavior during recovery. The diffusible hydrogen concentration was found to decay exponentially, and equations were found for the two types of steel. Hydrogen concentration decay rates were calculated to be -0.355 /hr in TBF steel, and -0.225 /hr in DP. Hydrogen concentration thresholds for embrittlement were found to be 1.04 mL/100 g for TBF steel, and 0.87 mL/100g for DP steel. TBF steel is predicted to recover from embrittlement within 4.1 hours, compared to 7.2 hours in DP steel. A two-factor method of evaluating recovery from embrittlement, requiring hydrogen concentration threshold and decay rate, is explained for use in predicting recovery after exposure to hydrogen. Anisotropic hydrogen diffusion rates were also observed on the surface of both steels for a short time after charging, as hydrogen left the surface through <001> and <101> grains faster than grains with <111> orientations. This could be explained by differences in surface energies between the different orientations.

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“…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

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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 advanced high strength steels

Abstract: Permeability experiments were used to study hydrogen diffusion and trapping The trapping effect was less significant at a more negative charging potential The lattice diffusion coefficient of hydrogen was measured The densities of reversible hydrogen trap sites was ~ 2 × 10 18 sites cm-2

Cited by 116 publications

References 43 publications

The effect of microstructure on hydrogen permeability of high strength steels

The effect of microstructure on hydrogen permeability of high strength steels

Microstructural evaluation of hydrogen embrittlement and successive recovery in advanced high strength steel

Influence of Hydrogen on Steel Components for Clean Energy

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