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TC4 titanium alloy fine-equiaxed-structure large-size bar short-process preparation method

A technology of equiaxed microstructure and titanium alloy, which is applied in the field of short-process preparation of large-scale rods with axial microstructure, can solve the problems of high production cost, large grinding loss, and long production cycle, so as to improve the efficiency of grain refinement, Reduced grinding loss and constant deformation temperature

Active Publication Date: 2020-06-16
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned conventional process, the total processing times are generally not less than 10 times, the production cycle is long, the grinding loss is large, and the end of the bar needs to be cut to remove the uneven area of ​​​​the deformed structure. Even if double-scale production is used, each One bar also needs to cut off 1.5 heads, the yield is low, and the production cost remains high

Method used

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  • TC4 titanium alloy fine-equiaxed-structure large-size bar short-process preparation method
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  • TC4 titanium alloy fine-equiaxed-structure large-size bar short-process preparation method

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Embodiment 1

[0030] This embodiment includes the following steps:

[0031] Step 1. Peel the cylindrical 8TC4 titanium alloy ingot with the specification of Ф720mm×550mm (section diameter×length) to the specification of Ф690mm×550mm (section diameter×length), and then perform 2 rounds of billet forging, among which, the first The initial forging temperature of fire billet forging is 1150℃, the final forging temperature is 930°C, and the total forging ratio is 8.4. After forging, it is air-cooled. For the second fire billet forging, the initial forging temperature is 1070℃ and the final forging temperature is 930. ℃, the total forging ratio is 10.8, air-cooled after forging, and the surface of the TC4 titanium alloy ingot is subjected to surface grinding treatment after the billet forging of each fire to obtain the primary forging billet;

[0032] Step 2: Put the primary forging blank obtained in step 1 at the initial forging temperature (T β Under the condition of -15℃), the upsetting forging of...

Embodiment 2

[0037] This embodiment includes the following steps:

[0038] Step 1. Peel the cylindrical TC4 titanium alloy ingot with a specification of Ф820mm×950mm (section diameter×length) to a specification of Ф790mm×550mm (section diameter×length), then perform 3 rounds of billet forging, among which, the first The initial forging temperature of fire billet forging is 1150℃, the final forging temperature is 940°C, and the total forging ratio is 6.0. After forging, it is air-cooled. For the second fire billet forging, the initial forging temperature is 1100℃ and the final forging temperature is 920. ℃, the total forging ratio is 9.6, air cooling after forging, the initial forging temperature of the third round of billet forging is 1050°C, the final forging temperature is 920°C, the total forging ratio is 10.2, after forging, air cooling, and billet opening per fire After forging, the surface of the TC4 titanium alloy ingot is subjected to surface grinding treatment to obtain the primary f...

Embodiment 3

[0044] This embodiment includes the following steps:

[0045] Step 1. Peel the cylindrical TC4 titanium alloy ingot with a specification of Ф640mm×550mm (section diameter×length) to a specification of Ф609mm×550mm (section diameter×length) and then perform 3 rounds of billet forging, among which, the first The initial forging temperature of fire billet forging is 1150℃, the final forging temperature is 910°C, and the total forging ratio is 8.4. After forging, it is air-cooled. The initial forging temperature of the second billet forging and the third billet forging are both The final forging temperature is 1070°C, the final forging temperature is 920°C, and the total forging ratio is 10.2. After forging, it is air-cooled, and the surface of the TC4 titanium alloy ingot is subjected to surface grinding treatment after each firing and forging to obtain the primary forging blank;

[0046] Step 2: Put the primary forging blank obtained in step 1 at the initial forging temperature (T β ...

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Abstract

The invention discloses a TC4 titanium alloy fine-equiaxed-structure large-size bar short-process preparation method which comprises the following steps: 1, a TC4 titanium alloy ingot is subjected tocogging forging by the adoption of a large-tonnage pressing machine, and a primary forged billet is obtained after air cooling; 2, the primary forged billet is subjected to upsetting-stretching forging by the adoption of the large-tonnage pressing machine, and an intermediate forged billet is obtained after quick cooling to the room temperature; 3, the intermediate forged billet is subjected to one-heating-number radial forging by the adoption of a large-tonnage precision forging machine, and a finished radial forged bar is obtained; and 4, the finished radial forged bar is subjected to annealing heat treatment, and a large-size TC4 titanium alloy bar of the fine grain structure is obtained. According to the TC4 titanium alloy fine-equiaxed-structure large-size bar short-process preparation method, the process of billet hot-forging through the large-tonnage pressing machine and radial forming through the large-tonnage precision forging machine is adopted, so that crystal grains can besufficiently crushed and refined, the crystal grain refining efficiency can be improved, the heating number during the forging process can be remarkably reduced, the preparation process can be shortened, the production cost can be reduced, and the TC4 titanium alloy bar yield can be improved.

Description

Technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and specifically relates to a short-process preparation method for a TC4 titanium alloy bar with a fine isometric structure and a large specification. Background technique [0002] Titanium alloy has excellent characteristics such as low density, high specific strength, corrosion resistance, and high temperature resistance. It is an ideal structural material and plays an extremely important role in the development of high-tech defense, weaponry and civilian industries. TC4 titanium alloy has a series of excellent characteristics such as simple composition, good workability, high specific strength, good strength and toughness matching, and long-term use at 400°C. It is currently the most widely used structural titanium alloy. Compared with steel blades, blades for aeroengines and gas turbines made of titanium alloys have a significant weight reduction effect, which can signif...

Claims

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Application Information

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IPC IPC(8): C22F1/18B21J1/02
CPCB21J1/025C22F1/002C22F1/183
Inventor 侯智敏王兴杨健吴晓东张智康聪李维杨佩李进元任利娜欧阳文博
Owner WESTERN TITANIUM TECH
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