Abstract
Superplastic forming of Ti-6Al-4V was investigated with three heats of material to examine the effects of extrinsic and intrinsic variables on strain rate sensitivity and flow stress. Tension tests with strain rate jumps and step strain rate tests were used to determine the effects of strain rate, strain, and temperature on strain rate sensitivity of Ti-6Al-4V. Superplastic forming of Ti-6Al-4V is strongly influenced by deformation temperature. The uniform elongation and the strain rate sensitivity were maximized at 900{degree}C in the temperature range tested. In the strain rate range tested, strain rate sensitivity increased slightly as the strain rate decreased. In examining the results, it was apparent that at high strains, grain growth decreased strain rate sensitivity. This decrease was a strong function of temperature, which minimized at 875{degree}C. The strong dependence of superplastic behavior on temperature can be related to relative amounts of alpha and beta in the microstructure, as shown in the model for superplastic deformation of Ti-6Al-4V.
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