The hot deformation behavior of Ti600 titanium alloy has been studied using the processing map technique. Compression test with gleeble-1500 thermal simulator were performed in the temperature range of 800–1100 °C and the strain rate range of 0.001–10 s −1 . The flow stress data obtained from the test were used to develop processing map according to dynamic material model and Prasad's instability criterion. In the processing map, the variation of the efficiency of the power dissipation is plotted as a function of temperature and strain rate. The map exhibits two domains of dynamic recrystallization occurring at the temperature range of 800–950 °C in the strain rate of 0.003–1 s −1 and the temperature range of 970–1070 °C in the strain rate range of 0.03–1 s −1 , respectively. Moreover, the superplastic of Ti600 alloy occurs at low strain rate ranges of 0.001–0.01 s −1 and high temperature range of 930–1100 °C with the peak efficiency higher than 60%, which are the optimum domain for hot working of Ti600 titanium alloy. The instability domain (flow localization and adiabatic shear) of flow behavior can also be recognized at the temperature range of 800–950 °C in the strain rate of 0.03–10 s −1 and the temperature range of 1070–1100 °C in the strain rate of 1–10 s −1 . The evidences of deformation in these domains were identified and validated through microstructure observations.

Clarification on the physical dimension of K in a constitutive equation for superplastic flow

Optimization of forging process parameters of Ti600 alloy by using processing map

The flow behavior of forged commercial purity (CP) titanium powder compact was studied by developing a processing map. CP titanium powder was sintered to 94% relative density, then hot compressed in a Gleeble thermal–mechanical simulator at strain rates ranging from 0.001 to 10 s−1 and deformation temperatures ranging from 600 to 800 °C. The hot forging process improved the densification to 98–99.9% and reduced the grain size from 93 to 10 µm by the occurrence of dynamic recrystallization. The fully dynamic recrystallization region is in the range of deformation temperature of 750–800 °C and strain rate of 0.001–0.01 s−1, with a power dissipation efficiency higher than 40%, determined by constructing a processing map and analyzing the volume fraction of dynamic recrystallization. This research provides a guide for powder compact forging of power metallurgy titanium by providing the hot compression parameters, which can lead to an improved microstructure and densification.

Clarification on the physical dimension of K in a constitutive equation for superplastic flow

Citations

Optimization of forging process parameters of Ti600 alloy by using processing map

Flow behavior and processing map of forging commercial purity titanium powder compact

References

Something ambiguous with superplasticity: a foreword to the special issue on superplasticity and superplastic technology in Japan

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