人工海水における耐海水2相ステンレス鋼の腐食疲労き裂進展挙動(<特集>疲労特集)

概要

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The corrosion fatigue crack growth rate of dual-phase stainless SUS329J1 has been measured in synthetic sea water at various stress ratios and stress cycle frequencies under free corrosion and a cathodic potential. In air the roughness-induced wedge effect enalarges the region II in the load-strain hysteresis loop. In synthetic sea water, the corrosion products- induced wedge effect under free corrosion and the Ca and Mg deposites-induced wedge effect under a cathodic potential are conspicuous, thereby enlarging the region II and rasing K_<op>. Under free corrosion the stress assisted dissolution accerelates the crack growth rate at a low ΔK_<eff>. In addition, at a high ΔK_<eff> at R=0.1 and f=0.17Hz the crack growth rate is much more accerelated due to hidrogen embrittlement. Under a cathodic potential, ΔK_<th> is remarkably high. But the crack growth rate is much accerelated due to hydrogen embrittlement in terms of ΔK_<eff>.
1987-10-15