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Preparation method of TC21 titanium alloy large-specification bar

A technology of TC21 and titanium alloy, which is applied in the field of preparation of large-scale rods of TC21 titanium alloys, can solve the problems of less reported processing methods, unevenness, and large deformation resistance of alloy large-scale rods, and achieve high-quality and qualified products. High efficiency and good tissue uniformity

Inactive Publication Date: 2014-01-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the high content of β-stabilizing elements, the TC21 alloy has better hot-working plasticity, but the deformation resistance is relatively large, and is limited by the pressure of the forging machine. At present, there are many studies on the small-size bars of the alloy, but the research on the large-size bars of the alloy Processing methods are less reported
Due to the problem of forgeability, for large-scale bars with a diameter of more than 160mm, especially super-large bars with a diameter of more than 300mm, conventional forging methods are very easy to produce uneven high- and low-magnification structures in the radial direction. To improve the microstructure uniformity of TC21 titanium alloy large-scale rods and meet the development requirements of aviation and aerospace industries, it is urgent to develop a new preparation method for TC21 titanium alloy large-scale rods

Method used

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  • Preparation method of TC21 titanium alloy large-specification bar
  • Preparation method of TC21 titanium alloy large-specification bar
  • Preparation method of TC21 titanium alloy large-specification bar

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Embodiment 1

[0037] The preparation method of the present embodiment TC21 titanium alloy large-scale bar comprises the following steps:

[0038] Step 1. The TC21 titanium alloy ingot with a specification of Ф720mm×1030mm is subjected to three times of billet forging, wherein the first time of billet forging is two upsetting and two drawing, the initial forging temperature is 1150°C, and the forging ratio is 5.6. The second blanking forging is three upsetting and three drawing, the initial forging temperature is 1100°C, the forging ratio is 8.4, the third firing forging is three upsetting and three drawing, the initial forging temperature is 1050°C, the forging ratio is 8.4, After the billet forging, the material is cut and blanked to obtain the primary forging billet; after each billet forging, the surface of the TC21 titanium alloy ingot is subjected to surface grinding treatment;

[0039] Step 2. Under the condition that the initial forging temperature is 20°C below the β transformation ...

Embodiment 2

[0044] The preparation method of the present embodiment TC21 titanium alloy large-scale bar comprises the following steps:

[0045] Step 1. The TC21 titanium alloy ingot with a specification of Φ720mm×930mm is subjected to 3 times of billet forging, wherein the first time of billet forging is two upsetting and two drawing, the initial forging temperature is 1150°C, and the forging ratio is 5.6. The second blanking forging is three upsetting and three drawing, the initial forging temperature is 1100°C, the forging ratio is 8.4, the third firing forging is three upsetting and three drawing, the initial forging temperature is 1050°C, the forging ratio is 8.4, After the billet forging, the material is cut and blanked to obtain the primary forging billet; after each billet forging, the surface of the TC21 titanium alloy ingot is subjected to surface grinding treatment;

[0046] Step 2. Under the condition that the initial forging temperature is 15°C below the β transformation point...

Embodiment 3

[0051] The preparation method of the present embodiment TC21 titanium alloy large-scale bar comprises the following steps:

[0052] Step 1. The TC21 titanium alloy ingot with a specification of Φ560mm×700mm is subjected to three times of billet forging, wherein the first time of billet forging is two upsetting and two drawing, the initial forging temperature is 1150°C, and the forging ratio is 5.6. The second blanking forging is three upsetting and three drawing, the initial forging temperature is 1100°C, the forging ratio is 8.4, the third firing forging is three upsetting and three drawing, the initial forging temperature is 1050°C, the forging ratio is 8.4, After the billet forging, the material is cut and blanked to obtain the primary forging billet; after each billet forging, the surface of the TC21 titanium alloy ingot is subjected to surface grinding treatment;

[0053] Step 2. Under the condition that the initial forging temperature is 50°C below the β transformation p...

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Abstract

The invention provides a preparation method of a TC21 titanium alloy large-specification bar, which comprises the following steps: 1, carrying out cogging forging on a TC21 titanium alloy ingot to obtain a primary forging stock; 2, carrying out upsetting forging on the primary forging stock to obtain an intermediate forging stock; 3, carrying out homogenization treatment; 4, carrying out forming forging on the intermediate forging stock to obtain the cylindrical TC21 titanium alloy large-specification bar with a section diameter of 160 mm to 400 mm. According to the invention, by carrying out homogenization treatment and optimizing a forging process, control of an alloy from an equiaxed structure to a tristate structure can be implemented, so that comprehensive regulation and control on intensity, plasticity, toughness and fatigue property are implemented. The preparation method adopts a simple and feasible process; the prepared TC21 alloy large-specification bar has uniform and fine tissues and high mechanical property, is suitable for large-scale industrial production and meets the development requirements of the aerospace industry on the high-quality large-specification TC21 titanium alloy bar.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a method for preparing large-scale rods of TC21 titanium alloy. Background technique [0002] TC21 alloy is a new type of titanium alloy with independent intellectual property rights in my country. Its strength, plasticity and toughness can reach: R m ≥1100MPa, Z≥10%, K IC ≥70MPa·m 1 / 2 , at the same time has a low crack growth rate, etc., has the international advanced performance level, is a high-strength, high-toughness and high damage tolerance titanium alloy with good application prospects. Due to its excellent comprehensive mechanical properties, it is an important material for main load-bearing structural parts used in aviation and aerospace in my country. With the development of my country's aviation and aerospace industries, higher specifications and quality requirements are put forward for TC21 alloy rods. [0003] Due to the hi...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 侯智敏毛小南赵永庆雷文光张鹏省洪权于兰兰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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