A study on hot deformation behavior of Ti-6Al-2V-0.5Zr-1.5Mo alloys

Abstract

Ti-6Al-2V-0.5Zr-1.5Mo alloys is a new type of titanium alloys developed on the basis of Ti-6Al-4V alloys. Compared with Ti-6Al-4V alloys, they are low in cost and excellent in performance. To offer an idea for hot working production, their thermal deformation behavior was studied through a Gleeble3500 machine, and the microstructure evolution during the thermal deformation was analyzed. After the experiment, the true stress-strain curves at strain rates of 0.001 s−1, 0.01 s−1, 0.1 s−1 and 1 s−1 at temperatures of 800 °C, 850 °C, 900 °C, and 950 °C were worked out. The result showed that the flow stress decreased as the deformation temperature rose and the strain rate fell. The peak stress constitutive equation and flow stress prediction model were built through the Arrhenius equation. The correlation coefficient between the predicted data and the experimental data reached 0.9811, which meant that the flow stress could be predicated accurately through Arrhenius equation. In addition, the processing map was established based on the DMM theory, and the best process parameters of such an alloy were figured out.