SYMPOSIA PAPER Published: 01 January 1978
STP28722S

Corrosion-Fatigue Properties of Recrystallization Annealed Ti-6A1-4V

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The corrosion-fatigue crack growth properties of recrystallization annealed (RA) Ti-6A1-4V were studied in room-temperature laboratory air, dry air, high-humidity air, sump-tank water, and 3.5 percent sodium chloride (NaCl) solution environments. The alloy was characterized by chemical, microstructural, and tensile properties. Corrosion fatigue tests were conducted using wedge-opening-load (WOL), center-cracked-through (CCT) and part-through-cracked (PTC) specimens. Frequency and environmental interactions were studied as well as the effects of orientation and stress ratio. The effect of frequency was to increase the fatigue crack growth rate as the frequency was decreased. A severe effect of frequency was noted in sump-tank water and saltwater where at low frequencies, crack growth rates increased to such a high level that failure occurred at Kmax levels significantly below those expected. Fractographic studies showed no apparent cause of this phenomenon.

Author Information

Ryder, JT
Lockheed-California Company, Rye Canyon Research Laboratory, Burbank, Calif
Krupp, WE
Lockheed-California Company, Rye Canyon Research Laboratory, Burbank, Calif
Pettit, DE
Lockheed-California Company, Rye Canyon Research Laboratory, Burbank, Calif
Hoeppner, DW
University of Missouri, Columbia, Mo
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Details
Developed by Committee: E08
Pages: 202–222
DOI: 10.1520/STP28722S
ISBN-EB: 978-0-8031-4714-0
ISBN-13: 978-0-8031-0314-6