Effect of {alpha} lamellae width on creep-fatigue behavior in near-{alpha} Ti-1100 with lamellar structure
- Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
- Korea Inst. of Machinery and Materials, Kyungnam (Korea, Republic of). Dept. of Materials Engineering
The high temperature Ti alloy Ti-1100 was recently developed for application in blades and disks in high pressure compressor parts for advanced gas turbine engines. The creep and fatigue properties of high temperature Ti alloys are known to depend on microstructural such parameters as phase morphology, phase dimensions, the degree of age-hardening. In addition, the creep and fatigue resistance of this alloy have been observed to depend very strongly on the cooling rate from the solution treatment temperature. Previous studies have reported that with increasing cooling rates, creep resistance generally increases, reaches maximum, and then drastically decreases. For both bi-modal and fully lamellar structures, the highest creep resistance was found for intermediate cooling rates of around 10K/s. On the other hand, Saal et al. have reported that the in the case of LCF behavior, the increasing width of the {alpha} lamellae with decreasing cooling rate leads to early crack nucleation, thereby decreasing the 10{sup 4} cycles fatigue strength. In the present study, the effect of cooling rate on the microstructure and in turn the creep-fatigue behavior of Ti-1100 at 600 C will be investigated.
- OSTI ID:
- 329164
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 3 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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