鋼材および溶接継手の 3% NaCl 水溶液腐食疲れに関する研究(第 2 報) : 鋼材の腐食疲れにおよぼす結晶粒度およびセメンタイト形状の影響

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The effect of some alloyed elements was described in the previous report. In this report, the effect of grain size, distribution of cementite of steel plates and dissolved oxygen in 3% NaCl aq. solution on the corrosion fatigue was investigated and compared with the fatigue strength in air. Results obtained are as follows : 1) In the case of fatigue test in air, slight difference of fatigue strength was observed by the difference of grain size, but there was no difference in the corrosion fatigue test. 2) The fatigue strength in air of the steel with dispersed cementite was slightly higher than that of the steel with lamellar perlite, but in the case of corrosion fatigue strength there was no difference by cementite distribution in steel test specimen. 3) The corrosion potential changed abruptly at the early cycles of corrosion fatigue test, and the damage due to corrosion fatigue reached to 80% at the same time. 4) Effect of dissolved oxygen on corrosion fatigue life was remarkable below 0.01cc/l of dissolved oxygen, but there was no linear relationship between dissolved oxygen and corrosion fatigue life over 0.01cc/l dissolved oxygen.
1975-09-05