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

F. G. Wei, T. Hara, K. Tsuzaki

Research output: Contribution to journalReview articlepeer-review

118 Citations (Scopus)

Abstract

Critical assessment of the existing models for the desorption rate of hydrogen dapped in steel indicated that the desorption rate can be described by the kinetic formula dX/dt = A(1 - X) exp (-Ed/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-0.30T1 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.

Original languageEnglish
Pages (from-to)587-597
Number of pages11
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume35
Issue number3
DOIs
Publication statusPublished - Jun 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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