Interaction between Dislocation and Hydrogen Occluded in Single Crystal of Iron

Hydrogen Occlusion Behavior of Single Crystal of Iron and Mild Steel (Part 4)

Abstract

The hydrogen content, diffusion coefficient and permeation rate in single crystal of iron were measured with a modified electrochemical technique and were found to be in good agreement with Gonzalez' results. Screw dislocations introduced into a specimen resulted in the increased hydrogen content and decreased diffusion coefficient. From the theoretical analysis of interaction between the stress field of screw dislocation and hydrogen, the dislocation core was found to be a trapping site for hydrogen. The predicted temperature dependence of the content of such hydrogen agrees well with the experimental results.