オーステナイト系ステンレス鋼の0.9wt%食塩水中における疲労特性におよぼす溶存酸素の影響

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  • Effects of Dissolved Oxygen on Fatigue Characteristics of Austenitic Stainless Steel in 0.9wt% Sodium Chloride Solutions
  • オーステナイトケイ ステンレス コウ ノ 0 9wt% ショクエン スイチュウ ニ オケル ヒロウ トクセイ ニ オヨボス ヨウゾン サンソ ノ エイキョウ

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Fatigue life evaluations in low dissolved oxygen conditions have been considered as conservative in predicting fatigue strengths of biomaterials. However, dissolved oxygen is considered to increase crack propagation rates. It is necessary to observe whether the strength in low dissolved oxygen conditions becomes higher. In this paper, authors observed effects of dissolved gas on corrosion fatigue characteristics of austenitic stainless steels. Fatigue strength becomes higher in low dissolved O_2 NaCl aq. at stress ratio R=0.1. However, fatigue strength did not change in low dissolved O_2 NaCl aq. at stress ratio R=0.5 because of the effect of work hardening. Cycles to crack initiations became longer and crack growth rates became lower in low dissolved O_2 NaCl aq.. In conclusion, dissolved oxygen has effects of accelerating crack propagation processes.

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