The effect of microstructure on hydrogen permeability of high strength steels

Rudomilova, Darya; Prošek, Tomáš; Salvetr, Pavel; Knaislová, Anna; Novák, Pavel; Kodým, Roman; Schimo-Aichhorn, Gabriela; Muhr, Andreas; Duchaczek, Hubert; Luckeneder, Gerald

doi:10.1002/maco.201911357

Cited by 30 publications

(13 citation statements)

References 44 publications

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“…For the given charging conditions, the measured hydrogen contents increase linearly with increasing martensite area fraction, which could be due to hydrogen trapping at dislocations [38,41] in martensite, the lath martensite boundaries [20,42,43] or at ferrite/martensite interfaces [59,60]. This is in accordance with the experimental observations of Rudomilova et al [61], who estimated trap densities and effective diffusion coefficients of AHSS steel sheets as a function of the interface area between ferrite and martensite. By considering the well-known rule of mixture as…”

Section: Materials Characterizationsupporting

confidence: 87%

The role of hydrogen diffusion, trapping and desorption in dual phase steels

et al. 2022

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Hydrogen embrittlement (HE) of advanced high-strength steels is a crucial problem in the automotive industry, which may cause time-delayed failure of car body components. Practical approaches for evaluating the HE risk are often partially and contradictive in nature, because of hydrogen desorption during testing and inhomogenous hydrogen distributions in, e.g., notched samples. Therefore, the present work aims to provide fully parametrized and validated bulk diffusion models for three dual phase steels to simulate long-range chemical diffusion, trapping and hydrogen desorption from the surface. With one constant set of parameters, the models are able to predict the temperature dependency of measured Choo-Lee plots as well as the concentration dependency of measured effective diffusion coefficients. Finally, the parametrized and validated bulk diffusion models are applied for studying the role of the current density on the permeation time and the role of coatings as effective diffusion barriers. Graphical abstract

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Section: Materials Characterizationsupporting

confidence: 87%

The role of hydrogen diffusion, trapping and desorption in dual phase steels

et al. 2022

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“…Hydrogen solubility and activity are significantly influenced by chemical composition of alloy [33,34]. In other works [35,36] it is also shown that the microstructure affects permeability of aluminum alloys. The influence of solubility and hydrogen activity as a function of the content of some elements of alloy present in aluminum at a solution temperature of 500 °C is shown in Figure 3.…”

Section: Diffusivitymentioning

confidence: 90%

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Diehl¹,

Schneider²,

Clarke³

2021

Tecnol. Metal. Mater. Min.

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The solution treatment of aluminum alloys can be restricted by the presence of porosity defects caused by the moisture present in the process or by the hydrated front on the material surface. Hydrogen blisters cause deleterious effects on mechanical properties and surface finish. However, the formation of bubbles in solid aluminum is not caused only by the known reaction 2Al+3H 2 O=3H 2 +Al 2 O 3 , as it does not explain the interaction of the aluminum oxide layer with the formation mechanisms. In addition, the literature approaches show that there is more than one mechanism for the formation of these defects, but no work has made an association between them. Thus, the objective of this work is to carry out extensive research on the state of the art of hydrogen blister formation in aluminum alloys during the solubilization heat treatment. Contemplating different proposed mechanisms of bubble formation on the surface and structure, the analysis of this association of approaches indicated that the mechanisms depend on both permeability, where the hydrated oxide front creates passage for the formation of blister in the sublayer, as well as diffusion and hydrogen solubility in the microstructure.

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Section: Successive Build-up Permeation Transientsmentioning

confidence: 99%

“…This is known as the lattice diffusion coefficient of the steel, DL. Some authors have successfully applied this methodology to characterize hydrogen diffusivity in CrMo steels [33,[38][39][40]. The cathodic current density was increased in steps of 0.5 mA/cm 2 for the first two transients, and of 1 mA/cm 2 for the following ones (see Figure 2a).…”

Section: Successive Build-up Permeation Transientsmentioning

confidence: 99%

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Imdad¹,

Zafra²,

Arniella³

et al. 2021

Hydrogen

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It is well known that the presence of hydrogen decreases the mechanical properties of ferritic steels, giving rise to the phenomenon known as hydrogen embrittlement (HE). The sensitivity to HE increases with the strength of the steel due to the increase of its microstructural defects (hydrogen traps), which eventually increase hydrogen solubility and decrease hydrogen diffusivity in the steel. The aim of this work is to study hydrogen diffusivity in a 42CrMo4 steel submitted to different heat treatments—annealing, normalizing and quench and tempering—to obtain different microstructures, with a broad range of hardness levels. Electrochemical hydrogen permeation tests were performed in a modified Devanathan and Stachursky double-cell. The build-up transient methodology allowed the determination of the apparent hydrogen diffusion coefficient, Dapp, and assessment of its evolution during the progressive filling of the microstructural hydrogen traps. Consequently, the lattice hydrogen diffusion coefficient, DL, was determined. Optical and scanning electron microscopy (SEM) were employed to examine the steel microstructures in order to understand their interaction with hydrogen atoms. In general, the results show that the permeation parameters are strongly related to the steel hardness, being less affected by the type of microstructure.

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The effect of microstructure on hydrogen permeability of high strength steels

Cited by 30 publications

References 44 publications

The role of hydrogen diffusion, trapping and desorption in dual phase steels

The role of hydrogen diffusion, trapping and desorption in dual phase steels

Formation of hydrogen blisters during the solution treatment for aluminum alloys

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

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