Corrosion Fatigue Crack Growth of a High-tension Steel in NaCl Solution

概要

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The influences of specimen thickness, cyclic frequency and cathodic protection on the corrosion fatigue crack growth of a high-tension steel HT80 have been discussed in terms of ΔK_<eff>, and the accelerating mechanism of crack growth rate was made clear. In the relation between crack growth rate and ΔK, environmental and cathodic protection effects were not clearly observed, because the reduction of growth rates due to the wedge effect cancelled the acceleration due to hydrogen embrittlement. When the wedge effect was eliminated by using ΔK_<eff>, environmental effect, frequency effect and cathodic protection effect were clearly observed. Though there were observed no frequency effects at a low ΔK_<eff>, the acceleration of growth rates continued to a higher ΔK_<eff> at a lower frequency. The dominating factor below (ΔK_<eff>)th in corrosion fatigue crack growth in HT80 was stress-assisted dissolution and the one above (ΔK_<eff>)th was hydrogen embrittlement, and cathodic protection became effective below (ΔK_<eff>)th.
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