Model-based interpretation of thermal desorption spectra of Fe-C-Ti alloys

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

doi:10.1016/j.jallcom.2019.03.102

Cited by 52 publications

(30 citation statements)

References 60 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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“…This indicated that the trapping sites, corresponding to an E a of 60 kJ/mol, were indeed more irreversible in nature compared to the trapping sites with lower energies. Recently, Drexler et al [51] accomplished a model-based interpretation of the very same Fe-C-Ti TDS spectrum using finite element modeling. In their study, the fourth peak could be attributed to the carbon vacancies in the TiC precipitates.…”

Section: Fe-c-wmentioning

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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“…Their results were extremely valuable for other researchers to identify the different trapping sites observed by TDS. For example, Drexler et al [ 16 ] used these values to identify the different trapping sites related to titanium carbides in an Fe–C–Ti steel. Furthermore, Di Stefano et al [ 31 ] also indicated that the strongest trapping site is related to the carbon vacancies in the interior of TiC but the energy barrier for hydrogen to overcome to enter these trapping sites is extremely high, rendering it impossible for hydrogen to enter these traps at ambient temperatures.…”

Section: Introductionmentioning

confidence: 99%

The Potential of the Internal Friction Technique to Evaluate the Role of Vacancies and Dislocations in the Hydrogen Embrittlement of Steels

Vandewalle

Konstantinović

Depover

et al. 2021

steel research int.

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Hydrogen embrittlement of steels is known to have considerable impact in many engineering sectors. To be able to mitigate the hydrogen embrittlement problem, a profound comprehension of the interaction of hydrogen with the steel microstructure is required. Especially the interaction of hydrogen with dislocations and vacancies is very relevant as these defects are known to play an important role in hydrogen embrittlement. At present, thermal desorption spectroscopy is mostly used to study hydrogen–defect interactions. However, information obtained solely by this technique is insufficient to obtain a full understanding of the interaction of hydrogen with these defects in the steel microstructure. Herein, the use of internal friction, as a complementary technique to thermal desorption spectroscopy, to reveal the interaction of hydrogen with dislocations and vacancies, is reviewed based on the present understanding in the literature. Furthermore, the opportunities to use internal friction to characterize the interaction between hydrogen and these defects and to give more insight into the hydrogen embrittlement mechanism are discussed. It is demonstrated that internal friction has not yet been used to its full potential for this purpose, although it entails the opportunity to develop fundamental insights into the hydrogen embrittlement phenomenon.

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Model-based interpretation of thermal desorption spectra of Fe-C-Ti alloys

Cited by 52 publications

References 60 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

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

The Potential of the Internal Friction Technique to Evaluate the Role of Vacancies and Dislocations in the Hydrogen Embrittlement of Steels

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