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Environment and R-ratio effects on fatigue crack propagation transitions in Ti-6A1-4V (ELI)

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Abstract

The multiple-sloped relationship between da/dN and AK in stage II fatigue crack propagation regime in most engineering alloys has been a subject of considerable research efforts. Even though the crack closure is recognized as a crucial factor affecting FCP rates, closure effect on transition behavior is often ignored due to the uncertainties associated with ΔKeff value and the difficulties in measuring closure especially in aqueous environment. The present study therefore focused on the closure-free transition behavior in mill annealed Ti-6A1-4V in moist air and 1% NaCl at a fixed potential of -500 mVSCE as a function ofR ratio. The complex da/dN-ΔK relationship in Ti-6A1-4V remains after closure-correction for eachR ratio and environment, suggesting that closure is not a controlling factor for a transition, while it may complicate transition behavior. After closure-correction, the transition points and slopes are insensitive to R ratio in moist air, suggesting that R ratio effect on transition behavior in moist air is mostly due to crack closure. The 1% NaCl solution further complicates the da/dN-ΔKeff shape in Ti-6A1-4V at R ratios of 0.1 and 0.4 by superimposing cyclic stress corrosion cracking (SCC)-induced transition at intermediate ΔK regime. Varying R ratio in 1% NaCl is complex and appears to modify the cyclic and/or static SCC contribution.

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Authors and Affiliations

  1. Division of Materials Sci. and Eng., AMRI, Gyeongsang National University, 660-701, Chinju, Korea

    Sang-Shik Kim

  2. KATEC, 333-910, Chonan, Korea

    Meung-Ho Rhee

  3. Dept. of Metallurgical Eng., Sunmoon University, 336-840, Asan, Korea

    Chang-Soon Lee

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  1. Sang-Shik Kim
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  2. Meung-Ho Rhee
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  3. Chang-Soon Lee
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Kim, SS., Rhee, MH. & Lee, CS. Environment and R-ratio effects on fatigue crack propagation transitions in Ti-6A1-4V (ELI). Metals and Materials 2, 37–47 (1996). https://doi.org/10.1007/BF03025945

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