Hydrogen absorption characteristics of pure iron and eutectoid steel cold-drawn and annealed have been evaluated by Thermal Desorption Spectrometry (TDS). The pure iron specimens whose structure is ferrite (α), and eutectoid steel specimens whose structure is α/Fe3C lamellae, are produced under various degree of reduction area and under various heat treatment conditions. These specimens absorbed hydrogen in 20 mass % NH4SCN solution were measured using TDS. TDS analysis shows that the hydrogen desorption of pure iron has a single peak, while that of eutectoid steel has two peaks. The lower-temperature peak corresponds to hydrogen desorbed from trapping sites of point defects, of clusters, and of dislocations. The higher-temperature peak corresponds to hydrogen desorbed from trapping sites of interface dislocations between the α and Fe3C, and/or of point defects and of dislocations in Fe3C.

Subject
Steel structures, Dislocation, Iron, Desorption, Interfaces, Defects, Specimen preparation, Steel, Immersion, Risk reduction, Hardness, Annealing, Hydrogen
Keywords:
hydrogen, thermal desorption spectrometry, pure iron, eutectoid steel, trapping site, cold drawing
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2000
Association for Materials Protection and Performance (AMPP)
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