Untersuchungen zum Einfluß des Stahlgefüges auf die stationäre Wasserstoffpermeation

Riecke, Ernst

doi:10.1002/maco.19810320203

Cited by 27 publications

(12 citation statements)

References 27 publications

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“…A deformation-induced decrease of the permeability to H 2 gas was reported for a 0.5 wt pct carbon steel [19] cold rolled to 70 pct, whereas a large increase of permeability was observed in cold-worked AISI 4340 steel [35] and in spheroidized steel samples. [22] In studies involving cathodic hydrogen, the permeability of a mild steel was found to be decreased after cold rolling, [24] whereas the permeability of AISI 4130 steel is reported not to depend on deformation.…”

Section: Influence Of Deformation On the Permeability To Hydrogenmentioning

confidence: 95%

“…The term D eff exhibits the largest value for normalized AISI 4120 steel, in agreement with literature data, which show larger diffusivity values for pearlitic microstructures compared to bainitic or martensitic ones. [19,23,24] This deviation can be accounted for by a smaller density of trap sites (carbide interfaces and dislocations) in pearlite than in bainite.…”

Section: Influence Of Microstructure and Hydrogen Activitymentioning

confidence: 96%

“…The permeability to hydrogen of iron at room temperature is reported to be decreased [24] or not significantly modified [19,[32][33][34] by cold rolling. On the other hand, the influence…”

Section: Influence Of Deformation On the Permeability To Hydrogenmentioning

confidence: 99%

“…For example, the permeability to 1 bar of H 2 gas at room temperature of carbon steels or low-alloyed steels is, compared to pure iron, [19] decreased by a factor of 2 to 10, depending on the composition and microstructure of the steel. [20,21] On the other hand, the comparison of the permeability to hydrogen of cathodically charged materials requires the knowledge of the hydrogen equivalent pressure resulting from the cathodic reduction of hydrogen.…”

Section: Influence Of Microstructure On the Permeability To Hydrogenmentioning

confidence: 99%

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Quantification of hydrogen diffusion and trapping in 2.25Cr-1Mo and 3Cr-1Mo-V steels with the electrochemical permeation technique and melt extractions

Brass

Guillon

Vivet

2004

Metall Mater Trans A

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The electrochemical permeation technique was used to investigate the effect of microstructure, hydrogen activity, and stationary dislocations generated by tensile straining on the permeation and degassing of hydrogen. A conventional 2.25Cr-1Mo steel, with which the existing hydrotreating reactors are made, and a 3Cr-1Mo-V steel, which is a candidate material for the future generation of reactors, were selected for this study. The effective diffusion coefficient of hydrogen derived from permeation and degassing transients shows a slower diffusivity in the V-containing steel at room temperature, regardless of the hydrogen activity. A large plastic deformation obtained by tensile straining in the homogeneous deformation domain only leads to a moderate decrease of the hydrogen diffusivity in both steels. The results are compared with the literature data on hydrogen permeation in iron and ferritic steels. On the other hand, the hydrogen content was measured with the melt extraction method after cathodic charging and subsequent aging at room temperature for different times to determine the diffusible (lattice ϩ reversibly trapped) hydrogen concentration. It was shown that the latter is larger in 3Cr-1Mo-V steel, which contains, in addition, a large fraction of "strong reversible" traps. A good concordance was found between the diffusible hydrogen concentration values computed from steady-state permeation measurements and from graphical integration of decay transients. The validity of the quantification, from permeation experiments, of the diffusible hydrogen concentration in materials with complex microstructures is discussed.

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Section: Influence Of Deformation On the Permeability To Hydrogenmentioning

confidence: 95%

Section: Influence Of Microstructure and Hydrogen Activitymentioning

confidence: 96%

“…The permeability to hydrogen of iron at room temperature is reported to be decreased [24] or not significantly modified [19,[32][33][34] by cold rolling. On the other hand, the influence…”

Section: Influence Of Deformation On the Permeability To Hydrogenmentioning

confidence: 99%

Section: Influence Of Microstructure On the Permeability To Hydrogenmentioning

confidence: 99%

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Quantification of hydrogen diffusion and trapping in 2.25Cr-1Mo and 3Cr-1Mo-V steels with the electrochemical permeation technique and melt extractions

Brass

Guillon

Vivet

2004

Metall Mater Trans A

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“…Gas phase charging ensures a constant and reliable chemical potential of hydrogen at the input surface [12]. The electrochemical detection technique is according to Devanathan and Stachurski [13] in an experimental arrangement similar to that outlined in [14]. This arrangement consists of two compartments (input cell and detection cell) separated by the steel permeation membrane which has an exposed area of 1.9 cm 2 on both their entry and exit surfaces.…”

Section: Applications: Api 5l X60 Steel As-received (Ar) Conditionmentioning

confidence: 99%

Numerical Study of Hydrogen Trapping: Application to an API 5L X60 Steel

Castaño-Rivera¹,

Ramunni²,

Bruzzoni³

2012

ISRN Materials Science

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A numerical finite difference method is developed here to solve the diffusion equation for hydrogen in presence of trapping sites. A feature of our software is that an optimization of diffusion and trapping parameters is achieved via a non linear least squares fit. On the other hand, we have demonstrated that usual electrochemical hydrogen permeation tests are enough to assess hydrogen free energies of trapping in the range of −35 kJ/mol to −70 kJ/mol. These conclusions are obtained by assuming the presence of saturable traps in local equilibrium with hydrogen and are validated by means of simulated permeation and degassing transients. In addition, we check our model performing electrochemical hydrogen permeation tests at 30 • C, 50 • C, and 70 • C, on an API 5L X60 as received steel state to study its trapping and diffusion properties considering only one type of trapping site. The binding energies (ΔG) and the trap densities (N) are determined by fitting the theoretical model to the experimental permeation data. The steel presents a high density of weak traps, |ΔG| < 35 KJ/mol, namely, N = 1.4 × 10 −5 mol cm −3 . Strong trapping sites which alter the shape of the permeation transient are also detected; their ΔG values ranged from 57 to 72 KJ/mol.

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Effect of Boron as a Micro‐Alloying Element on the Behaviour of a 1038 Steel in a Hydrogen Environment

Bruzzoni

Domizzi

Luppo

et al. 1994

Hydrogen Effects in Materials

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Untersuchungen zum Einfluß des Stahlgefüges auf die stationäre Wasserstoffpermeation

Cited by 27 publications

References 27 publications

Quantification of hydrogen diffusion and trapping in 2.25Cr-1Mo and 3Cr-1Mo-V steels with the electrochemical permeation technique and melt extractions

Quantification of hydrogen diffusion and trapping in 2.25Cr-1Mo and 3Cr-1Mo-V steels with the electrochemical permeation technique and melt extractions

Numerical Study of Hydrogen Trapping: Application to an API 5L X60 Steel

Effect of Boron as a Micro‐Alloying Element on the Behaviour of a 1038 Steel in a Hydrogen Environment

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