Interaction of hydrogen with the microstructure of low-carbon steel

Ramunni, V.P.; Coelho, T. De Paiva; Miranda, Paulo Emílio V. de

doi:10.1016/j.msea.2006.07.089

Cited by 60 publications

(29 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Typical permeation transients calculated with the present method (which assumes local equilibrium) are also obtained by means of a software presented previously by Ramunni et al [7]. This software does not assume local equilibrium and directly solves the McNabb and Foster's equation (18).…”

Section: Validation Of the Present Methodsmentioning

confidence: 99%

“…Coherent precipitates like TiC can trap hydrogen in the distorted ferrite lattice around the precipitate with different trap energies [8]. In fact, it has been suggested that a full distribution of hydrogen trapping energies may exist, and this seems to be supported by the results of thermal desorption spectrometry [7], which is a very useful technique to assess hydrogen trapping energies. Briefly, through a numerical finite difference method, we want to solve the McNabb and Foster [1] differential equations in the case of unidirectional hydrogen flux: ] are, respectively, the trapping and detrapping kinetic constants.…”

Section: Isrn Materials Sciencementioning

confidence: 99%

“…However, the value of these parameters has not been validated yet through independent measurements. Following the formulation and methods of Ferris and Turnbull, Ramunni et al obtained trapping parameters for a steel with different microstructures, where the cementite morphology is changed through selected thermal treatments [7]. Although they are able to simulate permeation transients covering the whole possibilities of the McNabb and Foster formulations, they restricted themselves to the case of local equilibrium, by setting the kinetic parameters high enough to guarantee a fast hydrogen exchange between traps and normal lattice sites.…”

Section: Isrn Materials Sciencementioning

confidence: 99%

“…We calculate the density of trapping sites and the hydrogen binding energy of H with traps. In Section 7 we check our software with another more general to solve the McNabb and Foster equations [7]. Finally, a brief conclusion to summarize the relevant points of the present work is presented.…”

Section: Isrn Materials Sciencementioning

confidence: 99%

“…The agreement between fit and experimental transient is very good. It must be pointed out that the diffusion coefficient D is not fixed as in [7]. Instead, it is allowed to vary in order to obtain the best fit.…”

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

confidence: 99%

See 4 more Smart Citations

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

Castaño-Rivera¹,

Ramunni²,

Bruzzoni³

2012

ISRN Materials Science

View full text Add to dashboard Cite

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.

show abstract

Section: Validation Of the Present Methodsmentioning

confidence: 99%

Section: Isrn Materials Sciencementioning

confidence: 99%

Section: Isrn Materials Sciencementioning

confidence: 99%

Section: Isrn Materials Sciencementioning

confidence: 99%

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

confidence: 99%

See 3 more Smart Citations

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

Castaño-Rivera¹,

Ramunni²,

Bruzzoni³

2012

ISRN Materials Science

View full text Add to dashboard Cite

show abstract

The effect of microstructure on hydrogen permeability of high strength steels

Rudomilova

Prošek

Salvetr

et al. 2019

Materials & Corrosion

View full text Add to dashboard Cite

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

show abstract

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.

View full text Add to dashboard Cite

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.

show abstract

Interaction of hydrogen with the microstructure of low-carbon steel

Cited by 60 publications

References 9 publications

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

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

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

Contact Info

Product

Resources

About