Abstract
Ti-3Al-2.5V alloy was usually the α phase of HCP structure at room temperature which had obvious anisotropy. During tube rolling, α grain would be influenced by stress-strain state, deformation amount, ‘Q’ ratio to result the preferred orientation and formed texture. In order to obtain radial texture tube by rolling and improve the service quality of tube in the pipeline system, Φ25 mm Ti-3Al-2.5V alloy tubes was selected as billet for the experiment, and four kinds of tubes with outer diameter of Φ16mm was produced by single pass cold rolling with ‘Q’ ratios ranging from 0.65 to 2.0. The effect of ‘Q’ ratio on the texture of Ti-3Al-2.5V tube was studied. The result indicted that the initial texture of the tube is radial-circumferential equally distributed, and the radial basal texture enhances gradually with increasing ‘Q’ ratio. Since the angle between the C-axis of grain and the radial axis of RD decreases, the C-axis of grain distributes to the radial direction, and the more grain orientation from {112X} pyramidal to {0001} basal plane. The different ‘Q’ ratio would lead to different strain along the radial direction, circumferential direction, axial direction, thus affected the crystal orientation and distribution during tube rolling deformation. When ‘Q’ > 1, the tube mainly produced radial basal texture. By comparison with ‘Q’ < 1, the tube mainly produced circumferential basal texture. As a result, when the initial texture of the tube is radial-circumferential equally distributed, the ideal radial texture of the tube can be obtained by choosing rolling process with ‘Q’ > 2.0.
Highlights
In the selection of materials for aerospace applications, Ti-6Al-4V alloy is the most common titanium alloy
If the texture can be optimized or controlled by a reasonable process so that the basal texture could mainly be distributed along the radial direction of the tube, and the ability of resisting the thinning of the tube wall can be greatly enhanced when the hydraulic thin-walled tubing is subjected to the action of internal pressure, so as to improve the service reliability of the tube
The Φ25 × 2.8 mm Ti-3Al-2.5V alloy tube produced by Baoji Titanium Industry Co., Ltd. (Baoji, China). was selected as experimental material, which was the intermediate tube billet processed by Ti-3Al-2.5V titanium alloy ingot after forging, extrusion, multi-pass cold rolling and recrystallization annealing
Summary
In the selection of materials for aerospace applications, Ti-6Al-4V alloy is the most common titanium alloy. Low-alloying Ti-3Al-2.5V has high strength, high corrosion resistance and great cold deformation ability, which was used to produce tubes and was applied to aircraft hydraulic systems [1]. If the texture can be optimized or controlled by a reasonable process so that the basal texture could mainly be distributed along the radial direction of the tube, and the ability of resisting the thinning of the tube wall can be greatly enhanced when the hydraulic thin-walled tubing is subjected to the action of internal pressure, so as to improve the service reliability of the tube. When producing titanium and zirconium tube, the loading direction are mainly influenced by ‘Q’ ratio, and ‘Q’ ratio is the ratio of natural logarithm for wall reduction rate to diameter reduction rate
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