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Warm rolling processing method for controlling texture of titanium alloy seamless pipe and titanium alloy pipe

A technology for seamless pipes and processing methods, which is applied in metal processing equipment, manufacturing tools, temperature control, etc., can solve problems such as difficulty in obtaining high-ratio, high-strength radial textures, and achieve improved texture distribution, radial Effect of Texture Enhancement, High Strength and Fatigue Properties

Active Publication Date: 2020-03-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of the above-mentioned prior art, and provides a warm rolling processing method for controlling the texture of titanium alloy pipes, which solves the problem that it is difficult to obtain a high-ratio, high-strength radial texture of titanium alloy pipes through cold rolling. The problem is to improve the CSR of titanium alloy pipes, obtain titanium alloy pipes with high strength, plasticity and fatigue resistance, and the method is simple, easy to operate and control, and suitable for industrial scale production

Method used

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  • Warm rolling processing method for controlling texture of titanium alloy seamless pipe and titanium alloy pipe
  • Warm rolling processing method for controlling texture of titanium alloy seamless pipe and titanium alloy pipe
  • Warm rolling processing method for controlling texture of titanium alloy seamless pipe and titanium alloy pipe

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Effect test

Embodiment 1

[0037] This embodiment provides a titanium alloy pipe with a specification of TA18 with an outer diameter of φ6×wall thickness of 0.5mm, which is prepared by the following steps: tube blank: prepare a TA18 titanium rod with a diameter of φ100mm, cover it after drilling and drilling, and heat it On a 1600-ton extrusion machine, a φ39×6mm tube blank is extruded;

[0038] Warm rolling: heat the tube billet to 100°C in the induction coil, keep it warm for 15-30min, send it into the three-roller tube mill, carry out rolling deformation, and carry out 3-6 passes of warm rolling, and control the temperature of each pass. The rolling deformation rate is not less than 40% and not more than 55%; stress relief annealing: after warm rolling, the tube billet is sent to a vacuum heat treatment furnace, heated at 450°C, and the vacuum degree is less than 8×10 -2 Pa, time 24min;

[0039] Then pickling, cutting to length, and obtaining the titanium alloy pipe material of TA18 with the specifi...

Embodiment 2

[0041]The difference between this embodiment and embodiment 1 is that in the warm rolling step, the tube blank is heated to 200°C;

Embodiment 3

[0043] The difference between this embodiment and embodiment 1 is that in the warm rolling step, the tube blank is heated to 300°C;

[0044] Sampling is carried out for mechanical performance testing. The tensile strength of the stress-relieved annealed pipe after warm rolling is not less than 860MPa, and the plasticity is not less than 11%.

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Abstract

The invention provides a warm-rolling machining method capable of controlling the texture of a titanium alloy seamless tube and the titanium alloy tube. The machining method is characterized in that warm-rolling is carried out on the tube to form the texture which is mainly in the radial direction, wherein the radial texture is composed of a first radial texture and a second radial texture, the temperature of warm-rolling is 100-400 DEG C, and the temperature is preferably 200-350 DEG C. Compared with a cold rolling process, the warm-rolling machining method has the advantages that the comprehensive strength of the radial texture of the titanium alloy tube can reach more than 12, and the radial texture of the tube is advantageously enhanced by more than 17%; the distribution state of the texture of the tube is improved, and the CSR value is improved to be more than 2.0; and on the premise that the plasticity of the titanium alloy tube is not reduced, the tube acquires high strength andfatigue performance. The machining method is easy to control, simple and convenient to operate and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a warm rolling processing method for controlling the texture of titanium alloy seamless pipes and titanium alloy pipes. Background technique [0002] Titanium alloy pipes are used in aviation, aerospace, petroleum and sporting goods and other fields, and their weldability, mechanical properties, corrosion resistance, processing plasticity and formability are relatively good. Industrial pure titanium and low-alloyed TA18 belong to α-type titanium alloys. The α phase has close-packed hexagonal crystals and obvious anisotropy. Using the anisotropy of the texture to strengthen the pipe wall is of great significance to improve the performance of the pipe. Compared with traditional pure titanium, TA18 alloy has greatly improved the strength, and the advantages of cold working performance have also been retained. Therefore, it has become the prefer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/78B21B3/00C22F1/18B21B37/74
CPCB21B3/00B21B37/74B21B37/78B21B2201/08C22F1/183
Inventor 张旺峰张晖王玉会李野
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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