A combined thermal desorption spectroscopy and internal friction study on the interaction of hydrogen with microstructural defects and the influence of carbon distribution

Vandewalle, Liese; Konstantinović, M.J.; Verbeken, Kim; Depover, Tom

doi:10.1016/j.actamat.2022.118374

Cited by 10 publications

(2 citation statements)

References 71 publications

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“…2e, details in Supplementary Method section). These values correspond to the theoretically determined activation energies for (1) hydrogen desorbed from the body-centered cubic iron lattice 33,34 and hydrogen release from surface iron hydroxides; (2) high-angle grain boundaries and dislocations (constituting the low-angle grain boundaries) 35,36 ; (3) nano-pore and iron oxide (Fe 3 O 4 ) 28,37 ; and (4) remaining gangue inclusions (e.g. SiO 2 , Al 2 O 3 , etc.)…”

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confidence: 71%

How much hydrogen is in green steel?

Özgün,

Lu,

et al. 2023

npj Mater Degrad

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Hydrogen-based reduction of iron ores is the key technology for future sustainable ironmaking, to mitigate the CO2 burden from the steel industry, accounting for ~7–8% of all global emissions. However, using hydrogen as a reductant prompts concerns about hydrogen embrittlement in steel products. This raises the question of how much hydrogen remains from green ironmaking in the metal produced. We answer this question here by quantifying the amount of hydrogen in iron produced via two hydrogen-based ironmaking processes, namely, direct reduction and plasma smelting reduction. Results suggest no threat of hydrogen embrittlement resulting from using hydrogen in green steel production.

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confidence: 71%

How much hydrogen is in green steel?

Özgün,

Lu,

et al. 2023

npj Mater Degrad

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“…They report activation energies up to 42 kJ/mol directly at the dislocation core. To release hydrogen trapped at grain boundaries, an activation energy very similar to dislocations, which is specified to lie between 17 and 33 kJ/mol [19,37,43,44], is needed. For the activation energy of hydrogen trapped at the ferrite/Fe 3 C interface, it has to be clearly distinguished between the level of strain which was applied to the material because, in unstrained pearlitic steels, the ferrite/Fe 3 C interface shows activation energies between 23.5 and 31 kJ/mol [40,45,46].…”

Section: Thermal Desorption Spectroscopymentioning

confidence: 99%

On the Change in Hydrogen Diffusion and Trapping Behaviour of Pearlitic Rail Steel at Different Stages of Production

Eichinger,

Loder,

Tkadletz

et al. 2023

Materials

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To avoid hydrogen flaking in rail production, it is of crucial importance to understand the differences in hydrogen diffusion and trapping between different production steps. Therefore, as-cast unfinished material was compared with two finished rails, hot-rolled and head-hardened, using electron backscattered diffraction (EBSD), electrochemical permeation, and thermal desorption spectroscopy (TDS). A significant increase in dislocation density was in the head-hardened rail compared with the other material states. This leads to an effective hydrogen diffusion coefficient of 5.8 × 10−7 cm2/s which is lower by a factor of four than the diffusion coefficients examined in the other states. Thermal desorption spectroscopy analyses show a clear difference between unfinished and finished rail materials. While a peak in activation energy between 32 and 38 kJ/mol is present at all states, only as-cast unfinished material shows a second peak with an activation energy of 47 kJ/mol, which is related to microvoids. The results show that in the investigated material, the effect of increasing dislocation density has a stronger influence on the effective diffusion coefficient than the presence of a second active trapping site.

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Mechanism of the Interaction Between Hydrogen, Microstructure, and Mechanical Properties in Low-Alloy High-Strength Marine Steel

Zhang,

Li,

et al. 2023

J. of Materi Eng and Perform

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A combined thermal desorption spectroscopy and internal friction study on the interaction of hydrogen with microstructural defects and the influence of carbon distribution

Cited by 10 publications

References 71 publications

How much hydrogen is in green steel?

How much hydrogen is in green steel?

On the Change in Hydrogen Diffusion and Trapping Behaviour of Pearlitic Rail Steel at Different Stages of Production

Mechanism of the Interaction Between Hydrogen, Microstructure, and Mechanical Properties in Low-Alloy High-Strength Marine Steel

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