Study of the hydrogen diffusion and segregation into Fe–C–Mo martensitic HSLA steel using electrochemical permeation test
| Autor: | S. Frappart, Laurent Delattre, Xavier Feaugas, F. Thebault, Herve Marchebois, Juan Creus |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Hydrogen chemistry.chemical_element Thermodynamics 02 engineering and technology 7. Clean energy 01 natural sciences Diffusion 0103 physical sciences Grain boundary diffusion coefficient Effective diffusion coefficient General Materials Science Diffusion (business) 010302 applied physics Lattice diffusion coefficient General Chemistry Permeation 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemical Permeation Crystallography Diffusion process chemistry Trapping [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology Hydrogen embrittlement |
| Zdroj: | Journal of Physics and Chemistry of Solids Journal of Physics and Chemistry of Solids, Elsevier, 2010, 71 (10), pp.1467. ⟨10.1016/j.jpcs.2010.07.017⟩ |
| ISSN: | 0022-3697 |
| DOI: | 10.1016/j.jpcs.2010.07.017 |
| Popis: | Diffusion and trapping mechanisms are studied in order to improve Hydrogen embrittlement (HE) resistance of high yield strength steels. Investigations were carried on Fe–C–Mo model steel with a quenched and tempered martensitic microstructure. Hydrogen diffusion was studied by using the electrochemical permeation technique. The influence of the charging current densities in 1 M H 2 SO 4 at ambient temperature shows a relation between the apparent diffusion coefficient D app and the apparent subsurface concentration of hydrogen C 0app . Two domains can be separated and are mainly associated with a competition between two distinct processes: hydrogen trapping and hydrogen diffusion. These results are correlated to the quantities of reversible and irreversible traps into the membrane. Moreover, the experimental results revealed that the apparent diffusion coefficient increases and the total amount of trapped hydrogen decreases with temperature. The activation energy of the diffusion process (0.26 eV) and the trapping process (0.58 eV) are supposed to be, respectively, affiliated with lattice diffusion and with trapping on incidental dislocations and/or on martensitic lath interfaces due to misorientations (geometric necessary dislocations). |
| Databáze: | OpenAIRE |
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