A fractographic survey of environmental fatigue crack propagation in mill annealed Ti-6Al-4V sheet was carried out. The environments were dry argon, normal air, distilled water, and 3.5% aqueous NaCl. Test frequencies were 30 and 50 Hz. Fatigue striations were not observed for fractures in dry argon except at low growth rates. There was a striking difference between the fracture surfaces in gaseous and aqueous environments. A detailed explanation of the appearances of fractures in aqueous environments is given. Striation spacings were only in reasonable agreement with the macroscopic growth rate/cycle over a middle range in growth rates. The practical significance of these observations is discussed.
Subject
Crack growth,
Water,
Striations,
Rivers,
Sodium chloride,
Roughness,
Fracture surfaces,
Cleavage,
Crack propagation,
Argon,
Fractures,
Fatigue,
Slip
© 1976 National Association of Corrosion Engineers
1976
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