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Mechanisms of fatigue in mill-annealed Ti-6Al-4V at room temperature and 600°F

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Abstract

The mechanisms of the fatigue of mill-annealed Ti-6A1-4V were studied at 600°F and room temperature. Early crack initiationN 0/N f< 0.14) was found to occur in hcpα-grains by a slip-band mechanism under all but the least severe conditions of cyclic stress. Under cyclic stresses near the fatigue limit at room temperature, fatigue cracks began much laterN 0/N f ∼ 0.4) at the interface between hcpα and bccβ grains without detectable slip. Under all conditions, Stage I fatigue crack growth occupied 50 to 80 pct of the total life. Although mechanical twins were produced in profusion near the growing Stage II fatigue cracks, they appeared to play no role in crack initiation or Stage I crack growth; nor did they facilitate Stage II growth. None of the observations could be interpreted as evidence for a metallurgical instability or strain-induced phase transformation which might be harmful to the fatigue resistance of the alloy.

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Authors and Affiliations

  1. Midwest Research Institute, Kansas City, Mo.

    D. K. Benson & G. G. Shaw

  2. National Bureau of Standards, Washington, D. C.

    J. C. Grosskreutz

Authors
  1. D. K. Benson
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  2. J. C. Grosskreutz
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  3. G. G. Shaw
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J. C. GROSSKREUTZ, formerly with Midwest Research Institute

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Benson, D.K., Grosskreutz, J.C. & Shaw, G.G. Mechanisms of fatigue in mill-annealed Ti-6Al-4V at room temperature and 600°F. Metall Trans 3, 1239–1248 (1972). https://doi.org/10.1007/BF02642458

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  • DOI: https://doi.org/10.1007/BF02642458

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