Abstract
Fatigue crack growth characteristics in air and in ASTM synthetic sea water have been investigated on four 50kgf/mm2 TMCP steels and their weld-heat-affected-zone(HAZ). Tests were made under pulsating tension with a stress ratio of 0.1 and at a freqency of 30HZ in air and at a freqency of 0.17Hz in synthetic sea water. The da/dN-ΔK and da/dN-ΔKeff relations of these steels were conlpared and the following results were obtained. If the conrparison is made on their da/dN-ΔKeff relations, no appreciable differences are observed among the fatigue crack growth characteristics of these four steels and their HAZ, though some differences in fatigue crack growth behavior are observed if the comparison is made on da/dN-ΔK relations. In the da/dN-ΔKeff relations, the fatigue crack growth rates of these steels are accerelated by a factor of two to three in synthetic sea water compared with those in air, and the amounts of this accerelation in growth rate in synthetic sea water are about the same for these four steels and their HAZ. The fractographic observations were also made.
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