Hot deformation characteristics and dynamic recrystallization of Ti−6Al−4V−0.5Mo−0.5Zr alloy used for petroleum drill pipe

Abstract

The high-temperature compression deformation behavior of Ti−6Al−4V−0.5Mo−0.5Zr alloy was investigated at temperatures from 890 to 1030 °C and strain rates from 0.01 to 10 s⁻¹, and the corresponding dynamic recrystallization (DRX) mechanism was revealed. The results indicate that under different deformation conditions, the intensity of flow stress oscillations varied significantly. During thermal deformation in the α + β phase region, the stress−strain curves exhibited DRX. At temperatures below 950 °C, continuous dynamic recrystallization (CDRX) of the α grains and fracturing of the strip-like phase were apparent. At temperature higher than 950 °C, the β phase and a part of secondary α colonies underwent DRX.