Abstract
Uniaxial tension fatigue tests were carried out in air and in high vacuum environments using test pieces made of Ti-6Al-4V with small artificial defects. We examined environmental effects of high vacuum on S-N properties and fatigue crack growth limit. As a result, the following were obtained, (i) Regardless of defect sizes, fatigue lives in high vacuum were much longer than those in air. The slope of S-N curve showed different tendencies between in air and in high vacuum corresponding to defect sizes, (ii) The downward trend of ΔK_<th> with decreasing crack size existed not only in air but also in high vacuum, and the tendency was stronger in high vacuum than in air.
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