The effect of the interface character of TiC particles on hydrogen trapping in steel

Lee, Sung Man; Lee, Jun Young

doi:10.1016/0001-6160(87)90268-9

Cited by 100 publications

(51 citation statements)

References 11 publications

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“…Pressouyre et al [1] reported that coherent TiC are less effective as trap site compared to incoherent particles and that the E a as trap increases with precipitate size. Similar conclusions were drawn by Lee et al [4]. Wei et al [5] found that the amount of trapped hydrogen could be correlated to the size of the precipitate, suggesting that hydrogen is trapped at the TiC/matrix interface.…”

Section: Introductionsupporting

confidence: 80%

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: Introductionsupporting

confidence: 80%

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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“…According to Chun et al, 2124) the activation energy (22 kJ/mol) for detrapping of hydrogen atoms from austenite (£)/¾ interfaces was lower than those from grain boundaries and dislocations (between 26 and 35 kJ/mol). 19,25) Therefore, it is thought that the reason for peak broadening is probably due to the release of hydrogen atoms which were migrated to the £/¾ interfaces during the SSRTs. The peak broadening before and after the SSRTs was proportional to the amount of pre-strain, which shows good agreement with the increase in fraction of ¾-martensite with the pre-strain.…”

Section: )mentioning

confidence: 99%

The Effect of Pre-Strain on the Resistance to Hydrogen Embrittlement in 316L Austenitic Stainless Steel

Park

Jung

et al. 2014

Mater. Trans.

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The effect of pre-strain before hydrogen charging on the resistance to hydrogen embrittlement (HE) in the 316L austenitic stainless steel was investigated through the slow strain rate tensile test (SSRT), transmission electron microscopy, and thermal desorption analysis (TDA). The pre-strain suppressed mechanical twinning during the SSRT, regardless of hydrogen charging. However, it accelerated the ¾-martensitic transformation in hydrogen-charged specimens. The TDA revealed that whereas hydrogen atoms migrated from grain boundaries and dislocations mainly to the austenite (£)/¾ interfaces in pre-strained specimens during the SSRTs, they moved to the boundaries of fresh mechanical twins, which newly formed during the SSRTs, in the annealed specimen. The elongation loss by hydrogen charging became greater with increasing the pre-strain, indicating that pre-straining deteriorated the resistance to HE. This elongation loss by pre-strain resulted from both the increase in fraction of ¾-martensite with pre-strain and the segregation of hydrogen atoms to the £/¾ interfaces.

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“…With respect to the effect of the character of TiC particles on the hydrogen trapping behavior, Pressouyre 2) indicated that TiC becomes more reversible when it is more coherent with the matrix. Lee and Lee 8) obtained TiC particles of various sizes by quenching at different austenitizing temperatures and showed that fine TiC semi-coherent particles with a diameter of 2 to 4 nm displayed an additional hydrogen desorption rate peak at 475°C in addition to the peak at 607°C which resulted from incoherent particles. Furthermore, they suggested that the interaction energy between titanium carbide and hydrogen increases with particle size, resulting in a higher desorption rate peak temperature.…”

Section: )mentioning

confidence: 99%

“…TiC interacts strongly with hydrogen; therefore, its effect on hydrogen trapping and diffusivity has been studied as a model trap by many workers [3][4][5][6][7][8][9] by thermal desorption spectrometry (TDS) 10) and the hydrogen permeation test.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Trapping in Quenched and Tempered 0.42C-0.30Ti Steel Containing Bimodally Dispersed TiC Particles

et al. 2003

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The effect of tempering on hydrogen trapping in 0.42C-0.30Ti steel was studied by means of a hardness test, hydrogen thermal desorption spectrometry and high resolution transmission electron microscopy. In addition to the coarse undissolved TiC particles, fine TiC particles with a volume fraction up to 0.22 % precipitated during tempering at temperatures above 500°C. Coherent TiC square platelets with a diagonal length of about 2 nm and a thickness of less than 1 nm precipitated at 550 and 600°C, acting as reversible hydrogen traps. Tempering at 700°C caused the fine TiC particles to lose their coherency with the matrix, resulting in a very limited increase in reversibly trapped hydrogen content compared to the samples tempered below 500°C without TiC precipitation. On the other hand, the coarse undissolved TiC particles with an average diameter of 2 mm, acting as irreversible traps, greatly enhanced the irreversibly trapped hydrogen content when tempered at 500°C and were accompanied by a decrease in hydrogen desorption rate peak temperature. Comparison of both types of TiC particles with the same volume fraction indicated that the fine coherent TiC platelets were more effective in trapping hydrogen than the coarse incoherent undissolved TiC particles.KEY WORDS: hydrogen trapping; reversible and irreversible traps; titanium carbide; coherency; thermal desorption spectrometry; high resolution transmission electron microscopy.

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The effect of the interface character of TiC particles on hydrogen trapping in steel

Cited by 100 publications

References 11 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

The Effect of Pre-Strain on the Resistance to Hydrogen Embrittlement in 316L Austenitic Stainless Steel

Hydrogen Trapping in Quenched and Tempered 0.42C-0.30Ti Steel Containing Bimodally Dispersed TiC Particles

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