SYMPOSIA PAPER Published: 01 January 1976
STP33367S

Influences of Chemical and Thermal Environments on Delay in a Ti-6Al-4V Alloy

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The influences of chemical and thermal environments on delay in fatigue crack growth under elemental load spectra were examined for a mill-annealed Ti-6Al-4V alloy. The results indicate that delay is significantly affected by the hold time at high load in 3.5 percent NaCl solution at room temperature, and by both temperature and thermal history. In 3.5 percent NaCl solution, delay may be increased by 40 times through increasing the hold time from zero to 900 s, the specific amount depends on the overload ratio (Khmax/Kℓmax) and the maximum value of the low-amplitude fatigue load (or Kℓmax. Delay is generally higher at the higher test temperature (560°F or 293°C), although the trend in behavior associated with changes in loading variables is similar to that observed at room temperature. Delay is significantly increased when the high load is applied at a high temperature, with subsequent fatigue at room temperature. It is reduced by intermediate heating at a high temperature following a high-load excursion at room temperature, and is lowest when fatigue loads are applied at high temperature following a high-load excursion at room temperature. The significance of these results in terms of modeling and life prediction procedures is discussed.

Author Information

Shih, TT
Ebasco Services, Inc., New York, N. Y.
Wei, RP
Lehigh University, Bethlehem, Pa.
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Developed by Committee: E08
Pages: 113–124
DOI: 10.1520/STP33367S
ISBN-EB: 978-0-8031-4672-3
ISBN-13: 978-0-8031-0344-3