Abstract
To improve the susceptibility of hydrogen embrittlement, it is important to identify hydrogen trapping site, binding energies, and occupation ratios at various lattice defects in metals. Thermal desorption spectrometer heated from lower temperature (L-TDS) which we have developed enables us to analyze them, In the present study, the influence of carbon and carbide on peak temperatures of hydrogen desorption, binding energies and occupation ratios in iron was examined. The specimens including 6ppm, 0.005%, 0.01% and 0.1% carbon in iron were prepared. For dislocation trapping, the peak at 283K desorbed from dislocation decreases with increasing carbon content. The binding energy between dislocation and hydrogen decreases with increasing carbon content from 24.9kJ/mol to 17.7kJ/mol. The hydrogen occupation ratio at dislocations also decreases with increasing carbon content. These finding indicate that carbon in iron causes significant influence on trapping behavior, since interstitial atoms such as carbon occupy lattice defects instead of hydrogen.
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