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Cogging and forging method for improving structure uniformity of beta titanium alloy

A β-titanium alloy with uniform structure technology, which is applied in metal processing equipment and other directions, can solve problems such as unevenness, irreversibility, and coarse grains, and achieve the effect of improving structure uniformity, avoiding structure defects, and maintaining uniform structure

Active Publication Date: 2021-07-23
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coarse and uneven structure in the original cast state is often not fully and effectively improved, resulting in the low-magnification structure of the finished forgings prone to coarse and uneven grains, and large or strip-shaped α-equal defects distributed in the high-magnification structure
If there is no reasonable ingot forging process, these structural defects will eventually be inherited in the forging, and this defect cannot be eliminated through subsequent forging and heat treatment, which will eventually have an adverse effect on the structure and performance of the forging, and contribute to the quality of the forging. The use of buried quality hidden dangers

Method used

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  • Cogging and forging method for improving structure uniformity of beta titanium alloy
  • Cogging and forging method for improving structure uniformity of beta titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The specific process of this embodiment is: heat the Ti-1300 titanium alloy ingot with a diameter of Φ160 mm at 1100 ° C for 96 minutes, then place the Ti-1300 titanium alloy ingot along the length direction parallel to the axial direction of the forging anvil, and repeatedly Deform towards flattening with a flattening deformation of 30% to obtain a Ti-1300 titanium alloy forging billet, and then return to the furnace at 1000°C for 128 minutes for homogenization treatment, and finally air-cool to room temperature to obtain a Ti-1300 titanium alloy forging.

[0020] figure 1 It is the microstructure diagram of the Ti-1300 titanium alloy forging prepared by the present embodiment, from figure 1 It can be seen that the microstructure of the Ti-1300 titanium alloy forging is uniform equiaxed primary α phase dispersed in the β matrix.

Embodiment 2

[0026] The specific process of this embodiment is as follows: heat the TB8 titanium alloy ingot with a diameter of Φ160mm at 1180°C for 128min, then place the TB8 titanium alloy ingot along the length direction parallel to the axial direction of the forging anvil, and repeatedly flatten and deform it , and the flattening deformation is 40%, to obtain a TB8 titanium alloy forging billet, and then return to the furnace at 1100 ° C for 160 min for homogenization treatment, and finally air-cool to room temperature to obtain a TB8 titanium alloy forging.

Embodiment 3

[0028] The specific process of this embodiment is: heat the Ti-5553 titanium alloy ingot with a diameter of Φ160mm at 1150°C for 112min, then place the Ti-5553 titanium alloy ingot along the length direction parallel to the axial direction of the forging anvil, and repeatedly Deformation toward flattening, and the flattening deformation is 35%, to obtain Ti-5553 titanium alloy forging billet, and then return to the furnace at 1050 ° C for 144 minutes for homogenization treatment, and finally air-cooled to room temperature to obtain Ti-5553 titanium alloy forging.

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Abstract

The invention discloses a cogging and forging method for improving the structure uniformity of a beta titanium alloy. The cogging and forging method comprises the following steps of carrying out high-temperature heating and heat preservation on a beta titanium alloy cast ingot, carrying out radial forging, returning to a furnace, carrying out homogenization treatment, and carrying out air cooling to room temperature; in a radial forging process, placing the beta titanium alloy cast ingot in parallel with the axial direction of a forging anvil in the length direction, then flattening and deforming the beta titanium alloy cast ingot in the opposite direction repeatedly, and enabling the flattening deformation amount to range from 30% to 40%. According to the cogging and forging method, the beta titanium alloy ingot is placed in parallel with the axial direction of the forging anvil in the length direction through the radial forging process and repeatedly flattened and deformed in the opposite direction, and the homogenization treatment is combined, so that as-cast columnar crystal structures are crushed and then grow through static recrystallization, the structure defects are avoided, the structure uniformity of the beta titanium alloy is improved, and the requirements of aircraft manufacturing on titanium alloy large forgings or parts are met.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a billet forging method for improving the microstructure uniformity of a beta titanium alloy. Background technique [0002] Titanium alloys are widely used in aviation, aerospace and other fields due to their high specific strength, corrosion resistance, and high temperature resistance. Most titanium alloy parts are prepared by spongy titanium and alloying elements, smelted into ingots, and processed by forging to improve the structure and properties. [0003] At present, the traditional method of smelting titanium alloy ingots is vacuum consumable arc melting technology. Although the vacuum consumable arc smelting method is a mature smelting technology, due to the low melting temperature of the arc during the smelting process, the maintenance time of the liquid molten pool is short, and the macrostructure distribution of the ingot is fine grain a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J1/06C22F1/18
CPCB21J5/00B21J1/06C22F1/183
Inventor 周伟辛社伟张思远贾蔚菊毛成亮李倩李思兰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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