Diffusion Coefficients of Hydrogen in Carbon Steels between 278 and 318 K and Hydrogen Trapping Effect of Interface between Cementite and Ferrite

Hagi, Hideki

doi:10.2320/jinstmet1952.57.8_864

Cited by 19 publications

(7 citation statements)

References 1 publication

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“…Activation energies for diffusion that were estimated by permeation and desorption experiments at different temperatures have been well documented for defect-free iron [4][5][6][7][8][9][10][13][14][15] and steels containing traps like substitutional atoms, [7,8,16,17] dislocations, [18] and a few cases of second-phase particles like cementite. [19,20,21] The activation energy for hydrogen to diffuse in a normal iron lattice was reported to be very small, ranging from 5.69 to 7.12 kJ/mol, depending on the measurement method and sample-surface treatment. [22] However, in many cases, the activation energy is not calculated by changing the testing temperature but by simulating the permeation or isothermal-desorption data based on a trapping theory or a diffusion equation.…”

Section: Introductionmentioning

confidence: 99%

Precise determination of the activation energy for desorption of hydrogen in two Ti-added steels by a single thermal-desorption spectrum

Wei

Hara

Tsuzaki

2004

Metall Mater Trans B

150

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Critical assessment of the existing models for the desorption rate of hydrogen trapped in steel indicated that the desorption rate can be described by the kinetic formula dX/dt ϭ A(1 Ϫ X) exp (ϪE d /RT). Good fit of the formula has been found to the hydrogen released during thermal-desorption spectrometry (TDS) analysis from the coherent and incoherent TiC particles in 0.05C-0.22Ti-2.0Ni and 0.42C-0.30Ti steels. The activation energy (E d ) and the constant parameter A can be determined uniquely with high accuracy by a single spectrum simulation. The activation energy for hydrogen desorption from the incoherent TiC particle in the well-tempered 0.05C-0.22Ti-2.0Ni steel is 85.7 kJ/mol. In the 0.42C-0.30Ti steel, a higher activation energy of 116 kJ/mol was obtained for the coarse incoherent TiC when tempered at 650 °C and 700 °C. The activation energy decreased from 116 kJ/mol at 650 °C to 68 kJ/mol at 500°C. The nanosized TiC coherent precipitates in the 0.42C-0.30Ti steel were found to have an activation energy ranging from 46 to 59 kJ/mol, depending on the tempering temperature. A low value of much less than 10 4 s Ϫ1 was obtained for the constant parameter A for most cases, which suggested that the retrapping of the released hydrogen is not important in the thermal-desorption analysis.

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Section: Introductionmentioning

confidence: 99%

Precise determination of the activation energy for desorption of hydrogen in two Ti-added steels by a single thermal-desorption spectrum

Wei

Hara

Tsuzaki

2004

Metall Mater Trans B

150

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“…29,30) Specifically, the three possible hydrogen effects on dislocation-carbon/nitrogen interactions are separately examined by changing the timing of hydrogen charging. First, we investigate the effects of hydrogen charging after the dislocations are fully desorbed from the carbon/nitrogen atmosphere by deformation.…”

Section: Suppression Mechanism Of Strain-age-hardening In Carbon Steementioning

confidence: 99%

“…6, the dislocation core or its vicinity have sufficient spaces for the entry of carbon, nitrogen, and hydrogen. Furthermore, because the hydrogen diffusion velocity is 2.9 × 10 4 times faster than that of carbon in ferrite/pearlite steels 29,30) (nitrogen diffusion velocity is similar to that of carbon 31) ), hydrogen can segregate into dislocations without any significant effect on carbon/nitrogen. Subsequently, the hydrogen segregation at dislocations is considered to affect the strain aging behavior.…”

Section: Hydrogen Charging Immediately After Pre-strainingmentioning

confidence: 99%

Suppression Mechanism of Strain-age-hardening in Carbon Steel Associated with Hydrogen Uptake

2016

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“…5 and 6. It is reported that the diffusion coefficient of hydrogen in the carbon steels ranges from 4:2 Â 10 À9 $1:0 Â 10 À8 m 2 /s, 14,18) while that in the Al 2 O 3 ranges from 3:4 Â 10 À46 $2:6 Â 10 À29 m 2 /s. 19) Thus, it is assumed that the low diffusivity of hydrogen in the Al 2 O 3 is closely related to the HMT result obtained in this study, in which silver particles were not visible directly on the Al 2 O 3 inclusions.…”

Section: Interaction Of Hydrogen With Inclusionsmentioning

confidence: 99%

Hydrogen Permeation Estimated by HMT in Carbon Steel Exposed to Gaseous Hydrogen

et al. 2009

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Hydrogen permeation behavior in carbon steel exposed to gaseous hydrogen was visualized using a hydrogen microprint technique (HMT). Effects of hydrogen gas pressure and charging time on the hydrogen permeation were particularly examined. The amount of permeated hydrogen was dependent on the charging time during the exposure to gaseous hydrogen. It was found that silver particles, which represented the evolution site of hydrogen atoms, were distributed almost uniformly in the matrix after hydrogen gas charging. These particles were arranged at the periphery of the second phase particles such as Al 2 O 3 . Area density of the silver particles clearly increased when the time for hydrogen gas charging was increased. Preferential accumulation of silver particles around Al 2 O 3 particles was clearly identified; however, no silver particles were observed directly on the Al 2 O 3 particles. This indicated that hydrogen atoms were diffused not through the inside of the second phase particles but through the interface between the second phase particles and the matrix phase.

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Diffusion Coefficients of Hydrogen in Carbon Steels between 278 and 318 K and Hydrogen Trapping Effect of Interface between Cementite and Ferrite

Cited by 19 publications

References 1 publication

Precise determination of the activation energy for desorption of hydrogen in two Ti-added steels by a single thermal-desorption spectrum

Precise determination of the activation energy for desorption of hydrogen in two Ti-added steels by a single thermal-desorption spectrum

Suppression Mechanism of Strain-age-hardening in Carbon Steel Associated with Hydrogen Uptake

Hydrogen Permeation Estimated by HMT in Carbon Steel Exposed to Gaseous Hydrogen

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