Abstract
DAT54 is a new near a heat resistant Ti alloy developed for disk applications in the compressor part of jet engines. DTA54 with bimodal microstructure shows a good balance of fatigue strength and creep life, and performs better than Ti-6242s up to 873 K. However, the influence of microstructure on properties, especially the effect of the morphology of primary a on fatigue crack growth resistance is not understood. In this study, samples with different types of microstructure were prepared by applying different heat treatment temperatures, and the influence of microstructure on fatigue crack growth properties at ambient temperature and 823 K was investigated. Influence of environment was also investigated by testing in vacuum and in air condition. Acicular microstructure shows lower fatigue crack growth rates in Paris’ region than the bimodal microstructures at 823 K. For the bimodal structures, aspect ratio of primary a do not have apparent influence on fatigue crack growth rates in Paris’ region, whereas fatigue threshold (DKth) seems to be affected by the morphology of primary a.
Highlights
As the world economic growth increase, the number of people traveling by airplane has been increasing, and huge number of consumer products is shipped worldwide by express delivery services
Acicular microstructure shows higher fatigue crack propagation resistance than bimodal microstructure when testing in vacuum condition. 2
Acicular microstructure has a higher threshold than the bimodal microstructure. 3
Summary
As the world economic growth increase, the number of people traveling by airplane has been increasing, and huge number of consumer products is shipped worldwide by express delivery services.
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