Hot deformation behavior and processing parameters optimization of SP700 titanium alloy

Abstract

The Gleeble-3800 thermal simulator is used to perform isothermal and constant strain rate compression tests on SP700 titanium alloy under the conditions of deformation temperature of 700–950 °C and strain rate of 0.001–1 s−1. The processing map technology can be obtained based on dynamic material model, through this technology, its thermal deformation behavior can be studied and the appropriate processing parameter range can be optimized by combining the changes in the strain rate sensitivity exponent m, strain hardening exponent n and deformation activation energy Q. The results show that the flow stress of SP700 titanium alloy is sensitive to deformation temperature and strain rate. When the strain is 0.9, the strain rate sensitivity exponent m is greater than 0.5 when the deformation temperature is 800 °C and the strain rate is 0.001 s−1 and 1 s−1. Under this condition, the SP700 titanium alloy may have superplastic deformed. In addition, the analysis shows that when the deformation temperature is 775–825 °C, the strain rate is 0.3–1 s−1 and 0.001–0.002 s−1, this condition is the best processing parameter range of SP700 titanium alloy.