Preparation method of TC16 titanium alloy wire with superfine grain structures

A technology of TC16 and titanium alloy wire, which is applied in the field of titanium and titanium alloy material processing, can solve problems such as uneven compression deformation at room temperature, and achieve the effect of large-scale industrial production, high repeatability, and excellent room temperature plasticity

Active Publication Date: 2018-05-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the unidirectional compression experiment of TC16 titanium alloy at room temperature, Zhang Zhiqiang et al. found that when the compressive strain reached 1.4 (the deformation amount was 0.75), nanocrystals were found in both the α phase and the β phase in the severe deformation zone of the compressed sample, and the α phase The grain sizes of the β and β phases are 50 and 100 nm, respectively; however, due to the inhomogeneous compression deformation at room temperature, in addition to nanocrystals, there are also large-sized grains in the alloy

Method used

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  • Preparation method of TC16 titanium alloy wire with superfine grain structures
  • Preparation method of TC16 titanium alloy wire with superfine grain structures
  • Preparation method of TC16 titanium alloy wire with superfine grain structures

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Experimental program
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Effect test

Embodiment 1

[0026] The TC16 titanium alloy rough billet with a diameter of 50mm was kept at 880°C for 2 hours, rolled to a diameter of 11.5mm, and then held at 720°C for 2 hours, then furnace cooled to 550°C, and then air-cooled. Peel the skin to φ10.7mm, then centerlessly grind to φ10.5mm, the surface roughness Ra is 6.3μm; then the polished rod is subjected to room temperature roller die drawing deformation, lubricated with metal processing oil, the drawing speed is 4m / min, the deformation amount of each pass It is about 14%, and the cumulative deformation is 88%, and a wire with a diameter of φ3.6mm is obtained. The grain size of the α phase and β phase in the wire was detected, and the average grain size of the two phases was measured to be about 0.3 μm. For the specific SEM microstructure photos, see figure 1 , obtained TC16 titanium alloy wire with ultra-fine grain structure.

Embodiment 2

[0028] The TC16 rough billet with a diameter of 36mm was kept at 900°C for 2 hours, rolled to a diameter of 9.5mm, then kept at 720°C for 2 hours, and then furnace cooled to 550°C and air-cooled. Peel the skin to φ8.7mm, then centerlessly grind to φ8.5mm, the surface roughness Ra is less than 6.3μm; then the polished rod is subjected to room temperature roller die drawing and deformation, lubricated with metal processing oil, the drawing speed is 5m / min, and the amount of deformation per pass It is about 15%, and the cumulative deformation is 78%, and a wire with a diameter of φ4mm is obtained. The grain size of α phase and β phase in the wire was detected, and the average grain size of the two phases was measured to be 0.4 μm. For the specific SEM microstructure photos, see figure 2 , obtained TC16 titanium alloy wire with ultra-fine grain structure.

Embodiment 3

[0030] The TC16 rough billet with a diameter of 30mm was kept at 880°C for 2 hours, rolled to a diameter of 7.5mm, then kept at 760°C for 2 hours, and then furnace cooled to 550°C and air-cooled. Peel the skin to φ6.7mm, then centerlessly grind to φ6.5mm, the surface roughness Ra is less than 6.3μm; then the polished rod is subjected to room temperature roller die drawing deformation, lubricated with metal processing oil, the drawing speed is 8m / min, and the amount of deformation per pass It is about 18%, the accumulative deformation is 76%, and a wire with a diameter of φ3.2mm is obtained. The grain size of the α phase and β phase in the wire was detected, and the average grain size of the two phases was measured to be about 0.4 μm. For the specific SEM microstructure photos, see image 3 , obtained TC16 titanium alloy wire with ultra-fine grain structure.

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Abstract

The invention relates to a preparation method of a TC16 titanium alloy wire with superfine grain structures. The method comprises the following steps: carrying out surface treatment on a TC16 titaniumalloy wire blank, the alpha phase and beta phase dimensions of which are about 1-2[mu]m, after hot working deformation; and carrying out multi-pass room temperature roll-die drawing deformation withthe accumulated deformation reaching 75-90% to obtain the superfine grain TC16 titanium alloy wire, the alpha phase and beta phase average dimensions of which are smaller than 0.5[mu]m. According to the method, phenomena such as restoration and recrystallized softening are seldom generated when the TC16 titanium alloy grains are refined as the alloy is deformed at room temperature, so that the grain refining effect is remarkable. The preparation method provided by the invention is particularly suitable for industrially preparing the superfine wires, is simple in production step and has a goodapplication prospect.

Description

technical field [0001] The invention belongs to the technical field of processing titanium and titanium alloy materials, and in particular relates to a preparation method of TC16 titanium alloy wire with ultra-fine grain structure. Background technique [0002] Grain refinement is an important method to improve the comprehensive mechanical properties of materials. When the grain size of titanium alloy material is reduced to ultra-fine grain, the strength, fracture toughness, fatigue resistance and other properties of the material are greatly improved, and at the same time, the ability of superplastic forming can be greatly improved, and the superplastic forming temperature can be reduced. At present, scholars at home and abroad generally use severe plastic deformation (Severe plastic deformation, SPD) technology, such as equal channel angular extrusion (ECAP), high pressure torsional deformation (HPT), cumulative rolling technology (ARB) and hydrostatic extrusion (HE). ), e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04C22F1/18
Inventor 张志强董利民王海忠张兆雄关少轩
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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