EXPERIMENTAL-STUDY OF HYDROGEN DIFFUSION BEHAVIORS IN STRESS-FIELDS

Hydrogen diffusion behavior in a given stress field was studied for tw o high-strength, low-alloy (HSLA) steels using the electrochemical met hod. In unidirectional tensile stress fields, the apparent diffusion c oefficient increased with increases in the linear stress gradient para llel to the direction of diffusion. Steady flux (J(infinity)) increase d similarly. The ideal diffusion coefficient (D-0) increased with the stress gradient. D-0 and J(infinity) decreased when the direction of d iffusion was opposite to the stress gradient. Experimental results wer e consistent with the theoretical solution.