Notch effects on high-cycle fatigue properties of Ti-6Al-4V ELI alloy at cryogenic temperatures |
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| Authors: | T Yuri Y Ono T Ogata |
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| Affiliation: | Cryogenic Materials Group, Materials Information Technology Station, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan |
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| Abstract: | Notch effects on the high-cycle fatigue properties of the forged Ti-6Al-4V ELI alloy at cryogenic temperatures were investigated. Also, the high-cycle fatigue data were compared with the rolled Ti-5Al-2.5Sn ELI alloy. The one million cycles fatigue strength (FS) of the smooth specimen for the forged Ti-6Al-4V ELI alloy increased with a decrease of test temperature. However, the FS of each notched specimen at 4 K were lower than those at 77 K. On the other hand, the FS of the smooth and the notched specimens for the forged Ti-6Al-4V ELI alloy at 4 K were lower than those for the rolled Ti-5Al-2.5Sn ELI alloy. This is considered to be the early initiation of the fatigue crack in the forged Ti-6Al-4V ELI alloy compares with the forged Ti-5Al-2.5Sn ELI. |
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| Keywords: | High-cycle fatigue properties Notch effect Ti-6Al-4V ELI Cryogenic temperatures Internal fatigue crack initiation |
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