Abstract
The thin-walled seamless Ti-6Al-4V alloy tubing was prepared by cold rotary swaging (RS) with a 40% wall reduction. The microstructure, texture and residual stress of the tubing samples under different annealing temperatures were investigated. The results show that the grains of the tubing samples after RS are obviously refined and streamlined. The maximum density level displayed in the cut of orientation distribution function (ODF) increases from 4.51 to 8.32, with a basal tilt angle of 10° around the radial direction of the tubing, which indicates that the radial texture of the Ti-6Al-4V alloy tubing become stronger after RS. Additionally, the post-swaging annealing at 400 °C and 500 °C for 2.5 h were adopted to relieve the residual stress of the tubing samples. The former can just relieve at most 80% of the residual stress, while the latter can relieve 97% of the residual stress to achieve an almost stress-free state. Hence, it is thought that the annealing at 500 °C can achieve the better effect to relief the residual stress.
Published Version
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