Internal crack initiation in high cycle fatigue of Ti-6Al-4V alloys at cryogenic temperatures
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概要
- 論文の詳細を見る
As the maximum stress is decreased, the morphology of subsurface crack initiation site changes from consisting of a single facet to of many facets. The facet was identified as a cracked α phase by its morphology and composition analysis. The lower the maximum stress, the larger the size of subsurface crack initiation site. Using 'fs', the size of the projection of the subsurface crack initiation site on the main crack propagating plane as a shape parameter, the size of the subsurface crack initiation site can be related unequivocally to the maximum stress regardless of impurity concentration, microstructure and temperature. The dependence of initiation site size on the maximum stress can be accounted for by an assumption that the microcrack growth is controlled by a threshold condition.
著者
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Umezawa O
Yokohama National Univ. Yokohama Jpn
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Umezawa Osamu
Department Of Mechanical Engineering And Materials Science Yokohama National University
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Umezawa O.
National Institute For Materials Science
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Umezawa Osamu
National Institute For Materials Science
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Ishikawa Keisuke
National Research Institute For Metals Tsukuba Lab.
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Ishikawa Keisuke
First Research Group National Research Institute For Metals
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Nagai K
Metallurgical Processing Group Steel Research Center National Institute For Materials Science
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Umezawa Osamu
National Research Institute For Metals
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Ishikawa Keisuke
Tsukuba Laboratories, National Research Institute for Metals
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