SYMPOSIA PAPER Published: 01 January 1969

Effect of Microstructure on the Fatigue Properties of Ti-6Al-4V Bar


Microstructure can have a significant effect on the mechanical properties of titanium alloys. The extent of this effect on the fatigue properties of the Ti-6Al-4V alloy in small diameter bar (0.625 in., 15.875 mm) was studied. Microstructural variations were produced by heat treating from 1550 to 1950 F at 100 F intervals. Three different cooling rates (furnace cooling, air cooling, and water quenching) were employed for each temperature. The room-temperature tensile, smooth, and notch-fatigue properties were evaluated for each thermal condition.

Thermal treatments that resulted in grain coarsening were found to lower the fatigue strength of the alloy. Beta quenching resulted in good tensile and fatigue strengths but low tensile ductility. Optimum tensile and fatigue properties occur in material consisting of fine grained alpha-beta structures or in material containing mixtures of fine primary alpha and martinisitic alpha.

Author Information

Bartlo, LJ
Reactive Metals, Inc., Niles, Ohio
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Developed by Committee: E08
Pages: 144–154
DOI: 10.1520/STP33654S
ISBN-EB: 978-0-8031-4581-8
ISBN-13: 978-0-8031-0016-9