Abstract
The objective was to model the effect of the stress intensity factor range ΔK on the enhancement of the crack growth rate (ECGR) for medium to high strength steels in aqueous environments. Experimental results demonstrated that ΔK affected both the magnitude and time response of the ECGR. Tests on an HY-130 steel in de-aerated 3.5% NaCl solution showed that the magnitude of the ECGR ∝ K max 3 and that the time response of the ECGR ∝ ΔK −2.3. A model for the ECGR, as a function of K max and saturation charge transfer level, was developed using the heuristic modeling framework developed in Part I of this paper (J. P. Thomas and R. P. Wei, Mater. Sci. Eng., A159 (1992) 205–221) and a stress-assisted diffusion model taken from the literature. The model accounted for K in terms of its effect on the hydrogen distribution in the crack tip region and its effect on the surface reaction kinetics.
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