Microstructural based hydrogen diffusion and trapping models applied to Fe–C X alloys

Drexler, Andreas; Depover, Tom; Leitner, Silvia; Verbeken, Kim; Ecker, Werner

doi:10.1016/j.jallcom.2020.154057

Cited by 59 publications

(25 citation statements)

References 69 publications

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“…With

as site fraction of lattice H,

as trap site fraction and

as trapping energy for the k th sort of trap. The parameters of the model can be either determined from permeation experiments [ 51 , 52 ] or from thermal desorption spectroscopy measurements [ 53 , 54 ]. The applied model for the CP1200 steel only considers one effective trap with a trap energy of 30 kJ/mol and a trap density of 5.7 × 10 −7 [ 18 ].…”

Section: Methodsmentioning

confidence: 99%

Addressing H-Material Interaction in Fast Diffusion Materials—A Feasibility Study on a Complex Phase Steel

et al. 2020

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Hydrogen embrittlement (HE) is one of the main limitations in the use of advanced high-strength steels in the automotive industry. To have a better understanding of the interaction between hydrogen (H) and a complex phase steel, an in-situ method with plasma charging was applied in order to provide continuous H supply during mechanical testing in order to avoid H outgassing. For such fast-H diffusion materials, only direct observation during in-situ charging allows for addressing H effects on materials. Different plasma charging conditions were analysed, yet there was not a pronounced effect on the mechanical properties. The H concentration was calculated while using a simple analytical model as well as a simulation approach, resulting in consistent low H values, below the critical concentration to produce embrittlement. However, the dimple size decreased in the presence of H and, with increasing charging time, the crack propagation rate increased. The rate dependence of flow properties of the material was also investigated, proving that the material has no strain rate sensitivity, which confirmed that the crack propagation rate increased due to H effects. Even though the H concentration was low in the experiments that are presented here, different technological alternatives can be implemented in order to increase the maximum solute concentration.

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“…With

as site fraction of lattice H,

as trap site fraction and

Section: Methodsmentioning

confidence: 99%

Addressing H-Material Interaction in Fast Diffusion Materials—A Feasibility Study on a Complex Phase Steel

et al. 2020

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“…McNabb and Foster [7] assumed the trapping process can be summarized by the following chemical reaction [34…”

Section: Expressions Of the Trapped Hydrogen Concentration Ratementioning

confidence: 99%

Effect of transient trapping on hydrogen transport near a blunting crack tip

Charles

Mougenot

Gaspérini

2021

International Journal of Hydrogen Energy

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The paper revisits the way transient trapping is introduced in the literature based on the Sofronis and McMeeking model [1] of hydrogen transport. It is shown that the direct use of the improved formulation made by Krom et al. [2] for transient trapping may lead to nonphysical results of hydrogen concentration in case of an insulated system. The use of McNabb and Foster trapping kinetic equation is more relevant, and its ability to model both trap creation and kinetic trapping is investigated on a Small Scale Yielding configuration for the sake of comparison with a reference case from the literature. A parametric study is conducted, exhibiting differences with literature, and emphasizes on the significant effect of trapping kinetics on the hydrogen distribution.

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“…Depending on these conditions, it has to be pointed out that the diffusible hydrogen concentration cannot represent the lattice hydrogen concentration. According to TDS spectra of the complex phase (CP) steel and dual phase (DP) steel, it is obvious that the diffusible hydrogen concentration relates to the definition of the total hydrogen concentration, because no further peak, which would relate to deep trapping sites, such as precipitates or retained austenite, could be found for the investigated materials above 300 • C [23,25]. In this study, the hydrogen peaks from the TDS analysis are under 300 • C, which correspond to the diffusible hydrogen range in al-aluminum-coated martensitic steel in our previous studies [17,18,22].…”

Section: Hydrogen Trapping On Steel Grades During the Hot Stamping Processmentioning

confidence: 99%

Hydrogen Absorption and Desorption Behavior on Aluminum-Coated Hot-Stamped Boron Steel during Hot Press Forming and Automotive Manufacturing Processes

Kim

Jung

et al. 2021

Materials

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Our study mainly focused on diffusible hydrogen in aluminum–silicon-coated hot-stamped boron steel during a hot press forming process and in pre-treatment sequential lines of the automotive manufacturing process using a thermal desorption spectroscopy (TDS) technique. First, in the hot stamping procedure, as the soaking time increased in the heating furnace at a specific dew point when austenitizing, a high concentration of diffusible hydrogen was absorbed into the hot-stamped boron steel. Based on the TDS analysis of hydrogen absorbed from hot stamping, the activation energy value of hydrogen trapping in 1.8 GPa grade steel is lower than that of 1.5 GPa grade steel. This means that diffusible hydrogen can be more easily diffused into defective sites of the microstructure at a higher level of the tensile strength grade. Second, in sequential pre-treatment lines of the automotive manufacturing process, additional hydrogen did not flow into the surface, and an electro-deposition process, including a baking procedure, was effective in removing diffusible hydrogen, which was similar to the residual hydrogen of the as-received state (i.e., initial cold rolled blank). Based on these results, the hydrogen absorption was facilitated during hot press forming, but the hydrogen was sequentially desorbed during automotive sequential lines on aluminum-coated hot-stamped steel parts.

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Microstructural based hydrogen diffusion and trapping models applied to Fe–C X alloys

Cited by 59 publications

References 69 publications

Addressing H-Material Interaction in Fast Diffusion Materials—A Feasibility Study on a Complex Phase Steel

Addressing H-Material Interaction in Fast Diffusion Materials—A Feasibility Study on a Complex Phase Steel

Effect of transient trapping on hydrogen transport near a blunting crack tip

Hydrogen Absorption and Desorption Behavior on Aluminum-Coated Hot-Stamped Boron Steel during Hot Press Forming and Automotive Manufacturing Processes

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