| Summary: | Isothermal compression tests of TC18 titanium alloy at the deformation
temperatures ranging from 25°C to 800°C and strain rate ranging from 10-4
to 10-2 s-1 were conducted by using a WDW-300 electronic universal testing
machine. The hot deformation behavior of TC18 was characterized based on an
analysis of the true stress-true strain curves of TC18 titanium alloy. The
curves show that the flow stress increases with increasing the strain rate
and decreases with increasing the temperature, and the strain rate play an
important role in the flow stress when increasing the temperatures. By
taking the effect of strain into account, an improved constitutive
relationship was proposed based on the Arrhenius equation. By comparison
with the experimental results, the model prediction agreed well with the
experimental data, which demonstrated the established constitutive
relationship was reliable and can be used to predict the hot deformation
behavior of TC18 titanium alloy.
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