Factors Affecting Non-Propagation of Fatigue Crack in a Low-Carbon Steel : Effect of Oxide-Induced Crack Closure
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概要
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Rotating bending fatigue tests were carried out in air and in pure argon to clarify the effect of oxide-induced crack closure on crack non-propagation. The materials used were Ti added extra-low-carbon steel with no strain ageing, 0.02% carbon steel with a single ferrite phase, and annealed 0.19% carbon steel. The results obtained are as follows. (1) Threshold stress for fatigue crack growth is lower for Ti added extralow-carbon steel in argon than for that in air, though the fatigue crack has a tendency to propagate more slowly in argon than the air. The above result shows that oxide-induced crack closure plays a significant role in crack non-propagation. (2) It seems that the influence of oxide-induced crack closure on crack non-propagation is smaller than the influence of strain ageing and microstructure. (3) A non-propagating crack is observed in the steel with a single ferrite phase even when strain ageing and oxide-induced crack closure do not occur.
- 一般社団法人日本機械学会の論文
- 2001-01-15
著者
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YAKUSHIJI Terutoshi
Oita National College of Technology
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KAGE Masaharu
Oita National College of Technology
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Kage M
Oita National College Of Technology
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Yakushiji T
Oita National College Of Technology
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NISITANI Hironobu
Kyushu Sangyo University
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