SFVV 3 鋼の疲労き裂進展下限界特性に及ぼす高温酸化被膜の効果
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概要
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Near-threshold fatigue crack growth characteristics and crack closure in an A 508-3 steel were investigated at elevated temperatures (80°C, 100°C, 150°C, 288°C and 350°C). The results obtained are summarized as follows : (1) The threshold stress intensity factor range decreases with increasing the temperature upto 100°C and it increases afterward. (2) The occurrence of oxidation of crack surfaces has an important role on the near-threshold characteristics. The thin oxidation prevents the thick oxidation induces crack closure at the elevated temperatures (288°C and 350°C). (3) It can not be possible to detect exactly oxide induced crack closure by the back-face-strain unloading-compliance method.
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