SEDL / STP / STP796-EB / STP28938S

Influence of Heat Treatment on the Fatigue Lives of Ti-6Al-4V and Ti-4.5Al-5Mo-1.5Cr

Imam, MA
Research scientist and professor, The George Washington University, Washington, D.C.,

Fraker, AC
Metallurgist and general physical scientist, The National Bureau of Standards, Washington, D.C.,

Harris, JS
Metallurgist and general physical scientist, The National Bureau of Standards, Washington, D.C.,

Gilmore, CM
Research scientist and professor, The George Washington University, Washington, D.C.,

Pages: 15    Published: Jan 1983

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Abstract

This paper reports on the effects of heat treating on phase composition and fatigue behavior of the Ti-6Al-4V and the Ti-4.5Al-5Mo-1.5Cr alloys. Corrosion-fatigue experiments show that the Ti-6Al-4V alloy has the longest fatigue life when heat treated at 900°C and quenched. The Ti-4.5Al-5Mo-1.5Cr alloy has an increased fatigue life under higher strain when heat treated at higher temperatures in the α-β region. Comparison of the fatigue lives of the Ti-6Al-4V and Ti-4.5Al-5Mo-1.5Cr alloys in the mill-annealed condition shows that Ti-4.5Al-5Mo-1.5Cr has improved fatigue behavior in the high-cycle region, but Ti-6Al-4V is superior in the low-cycle region.