Abstract
In the present study, an internal fatigue crack initiation (IFCI) phenomenon in metastable beta Ti–15V–3Cr–3Al–3Sn (Ti–15–3) alloys with various heat treatment conditions was examined. As-solutionized Ti–15–3 alloy was aged in the temperature range between 350 and 500 °C for various duration of time, and each specimen was fatigued at an R ratio of 0.1 and a frequency of 80 Hz. It was found that an IFCI occurred in single phase and metastable beta Ti–15–3 alloys for a wide variety of heat treatment and loading conditions. The operating mechanism for the IFCI in beta Ti–15–3 alloys appeared to be varied depending on the microstructure as a result of different aging practices. The IFCI mechanisms for beta Ti–15–3 alloys were discussed based on the detailed SEM fractographic examinations and EDS analyses.
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