Corrosion fatigue crack growth of titanium alloys in aqueous environments

Dawson, Daniel B.; Pelloux, R. M.

doi:10.1007/bf02644669

Cited by 112 publications

(67 citation statements)

References 10 publications

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“…Similar arguments (31,32) have been proposed for corrosion fatigue crack growth in aqueous environments for a number of alloy systems, where the environmental contribution to cracking involves active path corrosion *The separate role of hydrogen in influencing fatigue crack growth at nearthreshold lev~ls is considere~ to be 1rimarilt independent of conventional hydrogen embr1ttlement mechan1sms, (1 • 11, 1 ) as discussed below.…”

Section: Discussionmentioning

confidence: 91%

Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels

Suresh¹,

Ritchie²

1982

Metal Science

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Section: Discussionmentioning

confidence: 91%

Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels

Suresh¹,

Ritchie²

1982

Metal Science

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“…Thus the differences in frequency effects reported in prior studies [ 14,15,17,18] with a +B titanium alloys can be rationalized. Figure 12 shows additional data for the Ti-8AI-IMo-IV material obtained from a constant-frequency test at 5.0 Hz where the crack did not deviate significantly from the plane of symmetry.…”

Section: -5fmentioning

confidence: 88%

Effects of Microstructure and Frequency on Corrosion-Fatigue Crack Growth in Ti-8Al-1Mo-1V and Ti-6Al-4V

Yoder

Cooley

Crooker

1983

Corrosion Fatigue: Mechanics, Metallurgy, Electrochemistry, and Engineering

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Fatigue crack growth studies were conducted on Ti-8Al-1Mo-1V and Ti-6Al-4V alloys in 3.5% NaCl aqueous solution. Each alloy was studied in two microstructural conditions and at two cyclic frequencies. Ti-8Al-1Mo-1V was heat-treated to produce a fine-grained duplex anneal microstructure and a coarse-grained Widmanstätten microstructure resulting from a beta anneal. The two microstructural conditions for the Ti-6Al-4V were an as-received mill anneal and a beta anneal. The two cyclic frequencies were 0.1 and 5.0 Hz. Each of the four alloy/microstructure combinations studied has been the subject of prior investigation regarding fatigue crack growth rate/microstructure interactions in ambient air environments. For both alloys, crack growth rates in air were found to be significantly reduced as a result of microstructural modifications associated with the beta anneal heat treatment. Although the salt water environment significantly accelerated crack growth rates for both alloys, this same ranking of fatigue crack growth resistance persisted in the present study. Both microstructures of the Ti-6Al-4V alloy exhibited a frequency crossover effect; in contrast, no significant frequency effects were observed in Ti-8Al-1Mo-1V in either microstructure. Similar frequency effects were seen in separate specimens cycled at a single constant frequency or in single specimens cycled at two alternating frequencies. Out-of-plane cracking was observed in both alloys in the beta-annealed condition. The effects of varying degrees of out-of-plane cracking on apparent crack growth rates are noted.

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“…Values of yield strcngth, Kjsc~. for 3.5% NaCI, and K~c are 940 MPa (vendor measured), 23 to 35 MPa ,,'m, and 65 to 75 MPa,,m, respectively, for MA Ti-6-4 [10,27]. LT-orientation compact tension (CT) specimens with width (W) of 63.5 mm and thickness (B) of 6.4 mm were prepared from the ccntral portion of the plate.…”

Section: Methodsmentioning

confidence: 99%

“…Single slope transitions were also reported for t~/~ titanium alloys in less inert environments, where the environmental effect could not be ruled out. Critically, multiple slope transitions were reported for the same alloys in moist air, distilled water or aqueous chloride environments [8,10,12]. It is premature to conclude that an environmental element is a requisite for multi-slope transition behavior, however, it is a possibility.…”

Section: Introductionmentioning

confidence: 97%

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

Kim

Rhee

Lee

1996

Metals and Materials

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The multiple-sloped relationship between da/dN and AK in stage II fatigue crack propagatitm 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 AI~. value and the difficulties in measuring closure especially in aqueous environment. The present study therefore focused on the closure-free transition behavic~r in mill annealed Ti-6AI-4V in moist air and 1% NaCI at a fixed potential of -500 mVscE as a function of R ratio. The complex da/dN-AK relationship in Ti-6AI-4V remains after closure-correction for each R 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% NaCI solution further complicates the da/dN-AK~.ft shape in Ti-6AI-4V at R ratios of 0.1 and (I.4 by superimposing cyclic stress corrosion cracking (SCC)-induced transition at intermediate AK regime. Varying R ratio in L% NaC1 is complex and appears to modifv the cyclic and/or static SCC contribution.

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Corrosion fatigue crack growth of titanium alloys in aqueous environments

Cited by 112 publications

References 10 publications

Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels

Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels

Effects of Microstructure and Frequency on Corrosion-Fatigue Crack Growth in Ti-8Al-1Mo-1V and Ti-6Al-4V

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

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