TDS Evaluation of the Hydrogen Trapping Capacity of NbC Precipitates

Wallaert, Elien; Depover, Tom; Pieters, Brecht; Arafin, Muhammad; Verbeken, Kim

doi:10.1115/1.860298_ch62

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The lower E a compared to the results of Wei et al [3,5] can probably be related to the difference in coherency of the precipitates. Similar findings were obtained by E. Wallaert et al [15] where a TDS evaluation of the hydrogen trapping of NbC precipitates was performed.…”

Section: Thermec 2013 Supplementsupporting

confidence: 88%

Evaluation of the Effect of TiC Precipitates on the Hydrogen Trapping Capacity of Fe-C-Ti Alloys

Depover

Eeckhout

Wallaert

et al. 2014

AMR

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The present work evaluates the hydrogen trapping behavior of different laboratory cast generic Fe-C-Ti martensitic alloys. Titanium carbides were precipitated in the materials by well-designed heat treatments. A quenched and tempered martensitic matrix with final strength above 1000 MPa was aimed for and verified by means of hardness measurements. Tempering allowed generating precipitates with different characteristics in terms of coherency, size and distribution due to the secondary hardening effect, as was evaluated by transmission electron microscopy. The hydrogen trapping capacity of the TiC precipitates was investigated by thermal desorption spectroscopy, while melt extraction was performed to determine the amount of hydrogen present after cathodic hydrogen charging. Generally, it could be concluded that the incoherent particles in the quenched material were not able to trap hydrogen, whereas the quenched and tempered material trapped hydrogen at the interface of small probably coherent TiC.

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Section: Thermec 2013 Supplementsupporting

confidence: 88%

Evaluation of the Effect of TiC Precipitates on the Hydrogen Trapping Capacity of Fe-C-Ti Alloys

Depover

Eeckhout

Wallaert

et al. 2014

AMR

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“…Both morphology and size of transition-metal carbides precipitated in steels can vary significantly depending on composition and manufacturing conditions (e.g., thermal treatment) [20][21][22][39][40][41] . Furthermore, the carbides are often sub-stoichiometric, containing a large amount of C vacancies.…”

Section: Theoretical Approachmentioning

confidence: 99%

First-principles investigation of hydrogen interaction with TiC precipitates inα-Fe

et al. 2016

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A correct description of hydrogen diffusion and trapping is the prerequisite for an understanding of the phenomenon of hydrogen embrittlement. In this study, we carried out extensive first-principles calculations based on density functional theory to investigate the interaction of H with TiC precipitates that are assumed to be efficient trapping agents mitigating HE in advanced high-strength steels. We found that there exists a large variety of possible trapping sites for H associated with different types of interfaces between the TiC particle and the Fe matrix, with misfit dislocations and other defects at these interfaces, and with carbon vacancies in TiC. The most efficient trapping by more than 1 eV occurs at carbon vacancies in the interior of TiC particles. However, these traps are difficult to populate at ambient temperatures since the energy barrier for H entering the particles is high. H trapping at the semicoherent interfaces between the TiC particles and the Fe matrix is moderate, ranging from 0.3 to 0.5 eV. However, a sufficiently large concentration of the carbide particles can significantly reduce the amount of H segregated at dislocation cores in the Fe matrix. A systematic comparison of the obtained theoretical results with available experimental observations reveals a consistent picture of hydrogen trapping at the TiC particles that is expected to be qualitatively valid also for other carbide precipitates with the rock-salt crystal structure.

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TDS Evaluation of the Hydrogen Trapping Capacity of NbC Precipitates

Cited by 2 publications

References 15 publications

Evaluation of the Effect of TiC Precipitates on the Hydrogen Trapping Capacity of Fe-C-Ti Alloys

Evaluation of the Effect of TiC Precipitates on the Hydrogen Trapping Capacity of Fe-C-Ti Alloys

First-principles investigation of hydrogen interaction with TiC precipitates inα-Fe

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