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A Study of Hydrogen Sulfide Accelerated Stress-Corrosion Cracking in D6ac Steel.
NAVAL RESEARCH LAB WASHINGTON D C
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Stress-corrosion cracking data for various tempers of D6ac steel is presented. The data pertain to aqueous and to gaseous hydrogen sulfide environments. The data show that the effect of increased tempering temperature increase the stress intensity threshold for stress-corrosion crack growth and in general decrease the velocities at any given stress intensity level. The effect of the hydrogen sulfide, compared to water, is to dramatically increase the velocities by two to three orders of magnitude, but the general shape of the velocity to stress intensity dependence remains unchanged. The tensile ligament instability model for subcritical crack growth is applied to the data. The increase in crack growth rates in going from aqueous to gaseous H2S environments is explained in terms of a velocity parameter of the model.
APPROVED FOR PUBLIC RELEASE