Modelling hydrogen migration and trapping in steels

Stopher, Miles Alexander; Lang, Peter; Kozeschnik, Ernst; Rivera-Dı́az-del-Castillo, P.E.J.

doi:10.1016/j.matdes.2016.05.051

Cited by 25 publications

(20 citation statements)

References 49 publications

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“…López‐Martínez et al also observed that larger grains and smaller grain boundary area led to fewer diffusion paths and as a result to lower diffusion coefficients in steel. On the other side, Stopher et al reported that the amount of trapping sites increased with decreasing grain size. Lan et al and Haq et al showed that coarsening of a steel matrix microstructure led to an increase of hydrogen diffusion coefficient.…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…Alongside precipitation hardening increasing the strength of the material, precipitates are indeed also considered to be beneficial hydrogen trapping sites. Since they lower the amount of harmful highly diffusible hydrogen, the susceptibility of the material to HE is decreased [11,12]. However, when trapping sites have irreversible hydrogen trapping characteristics, they lose their effectiveness once they are filled [13].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Microstructural Characteristics on the Hydrogen Permeation Transient in Quenched and Tempered Martensitic Alloys

Eeckhout

Depover

Verbeken

2018

Metals

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This work evaluates the permeation curve characteristics for four quenched and tempered generic, ternary alloys, each containing one specific carbide. The different carbides (W2C, Cr23C6, TiC, and V4C3, respectively) are induced by a quench and tempering treatment. The correlation is made between the different microstructural characteristics, including the carbides and the martensitic matrix, and the observed hydrogen diffusivity and thus the permeation transient. The permeation curves, obtained via the Devanathan and Stachurski method, are therefore compared with thermal desorption spectroscopy and hot extraction results. The delay of the permeation transient can be associated with the overall trap density, while the slope is related to the amount of reversible trapping sites. Generally, the obtained hydrogen permeation transient of the different ternary or Fe–C–X materials correlates with the hydrogen trapping ability. The following order of hydrogen diffusion is determined, i.e., Fe–C–V < Fe–C–Ti << Fe–C–Cr < Fe–C–W. The hydrogen trapping ability of the tempered induced carbides plays a decisive role in the value of the hydrogen diffusion coefficient.

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“…High hydrogen concentration reduces the ductility and toughness of steel, leading to unpredictable failures [3]- [6]. In general, the embrittlement effect is more pronounced in higher-strength steels [7]- [9]. Hydrogen can enter steel during corrosion, or processing steps like welding, painting, plating, and galvanizing [1], [10].…”

Section: Hydrogen Embrittlement Of Ahssmentioning

confidence: 99%

“…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%

“…There are at least 4 distinct theories on the mechanisms of HE [27]- [30], though a combination of multiple theories may be most accurate [31]- [33]. There has been great progress in modelling and simulating the diffusion of hydrogen in steels [9], [34]- [40]. Experimental methods to view and characterize actual locations of hydrogen concentrations and the effects on properties over time are still needed to help inform the mathematical simulations.…”

Section: Current Hydrogen Researchmentioning

confidence: 99%

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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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Modelling hydrogen migration and trapping in steels

Cited by 25 publications

References 49 publications

The effect of microstructure on hydrogen permeability of high strength steels

The effect of microstructure on hydrogen permeability of high strength steels

The Effect of Microstructural Characteristics on the Hydrogen Permeation Transient in Quenched and Tempered Martensitic Alloys

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

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