Effect of Substitutional Alloying Elements on the Diffusion Coefficient of Hydrogen in &amp;alpha;-Iron

Hagi, Hideki; Hayashi, Yasunori; Ohtani, Namio

doi:10.2320/jinstmet1952.45.3_276

Cited by 10 publications

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“…Activation energy, as well as the diffusivity of hydrogen, in pure iron and steel has been measured extensively by electrochemical-permeation, [4][5][6][7][8] gas-permeation, [9][10][11][12] and isothermal-desorption [13,14] experiments at a certain temperature. 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.…”

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

151

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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

151

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“…2. In addition, the data obtained by the other researchers [13][14][15] were plotted in the figure. The figure indicated that the present values were almost involved in the line of the data obtained by the other researchers, and then confirmed that the present transient of i H was validly measured.…”

Section: Diffusion Coefficients Of Hydrogen In the Steelsmentioning

confidence: 99%

“…(10). Equation (13) indicates that a larger C 0 / θ ad leads a larger k + 10 / k − 10 , meaning acceleration of hydrogen absorption rate or suppression of hydrogen desorption rate. A cathodic current density on the hydrogen absorption surface, i c , defines generally as follows,…”

Section: Estimation Of Hydrogen Absorption Ratementioning

confidence: 99%

Effect of Additional Element on Hydrogen Absorption for Iron in Acidic and Neutral Sulfate Solutions

et al. 2016

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“…However, in some pure metals and alloys Arrhenius plots of the diffusion coefficients cannot be represented by straight lines. This is caused by (i) lattice transformation (1) and magnetic transformation(2), i.e., the change in the activation energy of hydrogen diffusion and (ii) the effect of impurities (alloying elements)(3)- (5) and lattice imperfections(6)(7), i.e., the existence of several kinds of the activation energy of hydrogen diffusion.…”

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confidence: 99%

Diffusion Coefficients of Hydrogen in Ni–Cu and Ni–Co Alloys

Hagi

1986

Trans. JIM

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The diffusion of hydrogen in nickel and copper, and in fcc nickel-copper and nickel-cobalt alloys has been investigated over the temperature range from 260 to 1000K by a technique of electrochemical permeation and a technique of gas phase permeation. The temperature dependence of the diffusion plots of Din Ni-Cu and Ni-Co alloys can also be represented by straight lines. The activation energy for diffusion of hydrogen changes with the concentration of alloying element. It has a maximum at 70 at% Cu in Ni-Cu alloys and increases with increasing concentration of Co in Ni-Co alloys. The solubility of hydrogen (S) in nickel, copper, Ni-Cu alloys and Ni-Co alloys has been measured by a gas phase permeation method at temperatures between 560 and 1000K. The temperature rhenius plots of S in Ni-Cu and Ni-Co alloys can also be represented by straight lines. The solution enthalpy of hydrogen has a minimum at 30 at%Cu alloys and increases with increasing concentration of Co in Ni-Co alloys.

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Effect of Substitutional Alloying Elements on the Diffusion Coefficient of Hydrogen in α-Iron

Cited by 10 publications

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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

Effect of Additional Element on Hydrogen Absorption for Iron in Acidic and Neutral Sulfate Solutions

Diffusion Coefficients of Hydrogen in Ni–Cu and Ni–Co Alloys

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Effect of Substitutional Alloying Elements on the Diffusion Coefficient of Hydrogen in &alpha;-Iron

Cited by 10 publications

References 0 publications

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

Effect of Additional Element on Hydrogen Absorption for Iron in Acidic and Neutral Sulfate Solutions

Diffusion Coefficients of Hydrogen in Ni&ndash;Cu and Ni&ndash;Co Alloys

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Effect of Substitutional Alloying Elements on the Diffusion Coefficient of Hydrogen in α-Iron

Diffusion Coefficients of Hydrogen in Ni–Cu and Ni–Co Alloys