Abstract
For the purpose of separative determination of trap parameters for some types of H-trapping sites in a 35 pct-reduced high purity iron, a study has been performed with use of a two-steps electrochemical permeation technique. Two types of trapping sites, T I and T II, have been confirmed to exist. The T I sites have a binding energy of 63.1 kJ·mol−1 and a density of 1×1023 m−3. They are mostly annihilated by recovery annealing at temperatures below about 673 K. The sites T II have a binding energy of 46.4 kJ·mol−1 and a density of 7×1023 m−3. They are also significantly reduced on annealing at temperatures below about 573 K, but a final reduction occurs at around 730 K accompanied by recrystallization. The sites T II are believed to be core sites of edge dislocations. The significant reduction of T II on annealing at low temperatures suggests that the segregation of interstitial impurity atoms to dislocation-core sites precludes their occupancy by hydrogen. Another type of trapping sites, T III, having a binding energy roughly of 30 kJ·mol−1 are also pressumed to exist. The concentration and temperature dependency of H-diffusivity in the deformed iron can be well explained in terms of the coexistence of the three types of trapping sites.
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