caa a22 4500 477122051 CHVBK 20180405111639.0 cr unu---uuuuu 170330e19960201xx s 000 0 eng 10.1007/BF03025945 doi (NATIONALLICENCE)springer-10.1007/BF03025945 Environment and R-ratio effects on fatigue crack propagation transitions in Ti-6A1-4V (ELI) [Elektronische Daten] [Sang-Shik Kim, Meung-Ho Rhee, Chang-Soon Lee] 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. Springer, 1996 Kim Sang-Shik Division of Materials Sci. and Eng., AMRI, Gyeongsang National University, 660-701, Chinju, Korea aut Rhee Meung-Ho KATEC, 333-910, Chonan, Korea aut Lee Chang-Soon Dept. of Metallurgical Eng., Sunmoon University, 336-840, Asan, Korea aut Metals and Materials The Korean Institute of Metals and Materials 2/1(1996-02-01), 37-47 1598-9623 2:1<37 1996 2 12540 https://doi.org/10.1007/BF03025945 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF03025945 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Sang-Shik Division of Materials Sci. and Eng., AMRI, Gyeongsang National University, 660-701, Chinju, Korea aut NATIONALLICENCE 700 1- Rhee Meung-Ho KATEC, 333-910, Chonan, Korea aut NATIONALLICENCE 700 1- Lee Chang-Soon Dept. of Metallurgical Eng., Sunmoon University, 336-840, Asan, Korea aut NATIONALLICENCE 773 0- Metals and Materials The Korean Institute of Metals and Materials 2/1(1996-02-01), 37-47 1598-9623 2:1<37 1996 2 12540 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer