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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

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Abstract

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=A(1-X) exp (-E 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 104 s−1 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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Authors and Affiliations

  1. the Steel Research Center, National Institute for Materials Science, 305-0047, Tsukuba, Ibaraki, Japan

    F. G. Wei (Postdoctoral Fellow), T. Hara (Senior Researcher) & K. Tsuzaki (Deputy Director-General)

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  1. F. G. Wei
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  2. T. Hara
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  3. K. Tsuzaki
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Wei, F.G., Hara, T. & Tsuzaki, K. Precise determination of the activation energy for desorption of hydrogen in two Ti-added steels by a single thermal-desorption spectrum. Metall Mater Trans B 35, 587–597 (2004). https://doi.org/10.1007/s11663-004-0057-x

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  • DOI: https://doi.org/10.1007/s11663-004-0057-x

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