Dwell time low cycle fatigue (DLCF), low cycle fatigue (LCF), and creep tests were
performed at ambient temperature on Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242Si). Test
specimens were solution annealed at various temperatures below the beta transus to
control the volume fraction of primary alpha. The influence of the changes in primary
alpha phase on low cycle dwell time fatigue life were determined and compared to the
conventional low cycle fatigue properties of the alloy. A dwell period significantly
decreased the number of cycles to failure, but by a decreasing factor with decreasing
stress. The increased primary alpha phase present associated with lower solution anneal
temperatures significantly increased susceptibility to low cycle dwell time fatigue. It is
believed that dwell fatigue sensitivity may be associated with cyclic, ambient temperature,
time-dependent plasticity (creep). / Graduation date: 1999
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33653 |
| Date | 20 November 1998 |
| Creators | Faber, Robyn O. |
| Contributors | Kassner, Michael E. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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