Small crack growth tests were carried out on Ti-6Al4-V forge alloy with two kinds of microstructures prepared by differenTheat treatments. Small and long fatigue crack growth rates, da/dN, are presented against the stress intensity range, ΔK. The results showed the classic small crack effects for the both kinds of microstructures under constant amplitude loading and that the small crack effect was more pronounced at R=-1. Compared the small crack effects of two kinds of microstructures at the same stress ratio, R. It shows that the small cracks effects for both microstructures are same at R=-1. However, at R=0, it is show more pronounced small crack effect for the microstructure with finer grain size.
Key words
small crack /
Ti-6Al4-V alloy /
lamellar microstruct
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