Hydrogen permeation transients for low-carbon iron were measured at room temperature; pure nickel and 17Cr-12Ni austenitic stainless steel (SS) specimens were electrochemically charged with hydrogen. The results for unstrained specimens were compared with those obtained under conditions of continuous stretching. A slight increase in the permeation rate for iron was observed in the range of elastic deformation, with no change in effective diffusivity. Plastic deformation caused a substantial reduction of both the diffusivity and permeability of hydrogen. The magnitude of these effects depended on the amount of strain but was independent of the strain rate; this suggested they were caused by an enhanced trapping of hydrogen. Only a slight influence of plastic deformation on the effective diffusivity and permeability of hydrogen was observed in nickel and austenitic SS.

Subject
Strain rate, Dislocation, Diffusion, Permeability, Iron, Permeation, Constants, Experimental data, Metals, Steel, Nickel, Plastic deformation, Hydrogen
National Association of Corrosion Engineers
1985
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