Forming method for achieving structure grain refining of near-beta type titanium alloy thin-wall structural part

A technology of thin-walled structural parts and titanium alloys, which is applied in the direction of metal processing equipment, can solve the problems of difficult control of forming stability and difficulty in microstructure regulation, and achieve the effects of shortening the development cycle, fine grains, and efficient manufacturing

Active Publication Date: 2021-06-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of the existing technology that the forming stability is not easy to control and the microstructure is difficult to control, the present invention proposes a forming method to realize the microstructure fine-graining of near-β-type titanium alloy thin-walled structural parts

Method used

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  • Forming method for achieving structure grain refining of near-beta type titanium alloy thin-wall structural part
  • Forming method for achieving structure grain refining of near-beta type titanium alloy thin-wall structural part
  • Forming method for achieving structure grain refining of near-beta type titanium alloy thin-wall structural part

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Embodiment 1

[0041] This embodiment is a forming method for realizing fine-grained structure of TB6 near-β-type titanium alloy structural parts with a wall thickness less than 0.8 mm. The specific process is:

[0042] Step 1, multi-stage heat treatment in the β / (α+β) phase zone:

[0043] TB6 titanium alloy rods with a specification of Φ90mm are used, and the phase transition temperature is 805°C. Put the TB6 titanium alloy rod into a vacuum heat treatment furnace for multi-stage heat treatment to obtain lamellar structure. The heat treatment system is as follows: first heat it to 40°C above the β transformation point and keep it for 50 minutes; Furnace cool the bar to 750°C at a cooling rate of 100°C, and continue to keep it warm for 40 minutes at this temperature; after the heat preservation is over, furnace cool the bar to room temperature.

[0044] A TB6 titanium alloy bar material that has undergone multi-stage heat treatment is obtained. Its microstructure is as figure 2 As shown,...

Embodiment 2

[0061] This embodiment is a forming method for realizing fine-grained structure of Ti-55531 near-β-type titanium alloy structural parts with a wall thickness less than 0.8mm. The specific process is:

[0062] Step 1, multi-stage heat treatment in the β / (α+β) phase zone:

[0063] Ti-55531 titanium alloy rods with a size of Φ90mm are used, and the phase transition temperature is 845°C. Put the Ti55531 titanium alloy bar into a vacuum heat treatment furnace for multi-stage heat treatment to obtain lamellar structure. The heat treatment system is as follows: first heat it to 60°C above the β transformation point and keep it for 40 minutes; Furnace cool the bar to 650°C at a cooling rate of 100°C, and continue to keep it warm for 50 minutes at this temperature; after the heat preservation is over, furnace cool the bar to room temperature.

[0064] A Ti-55531 titanium alloy bar material after multi-stage heat treatment was obtained. Its microstructure is as Figure 5 As shown, th...

Embodiment 3

[0081] This embodiment is a forming method for realizing microstructure refinement of a Ti-7333 metastable β-type titanium alloy structure with a wall thickness less than 0.8 mm. The specific process is:

[0082] Step 1, multi-stage heat treatment in the β / (α+β) phase zone:

[0083] Ti-7333 titanium alloy rods with a specification of Φ90mm are used, and the phase transition temperature is 850°C. Put the Ti-7333 titanium alloy bar into a vacuum heat treatment furnace for multi-stage heat treatment to obtain a lamellar structure. The heat treatment system is as follows: first heat it to 50°C above the β transformation point and keep it for 30 minutes; The cooling rate of min is to furnace cool the bar to 700°C, and continue to keep warm for 30 minutes under this condition; after the heat preservation is completed, furnace cool the bar to room temperature.

[0084] A Ti-7333 titanium alloy bar material that has undergone multi-stage heat treatment is obtained. Its microstructur...

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Abstract

The invention relates to a forming method for achieving structure grain refining of a near-beta type titanium alloy thin-wall structural part. The forming process comprises the steps of beta / (alpha + beta) phase region multi-section heat treatment, (alpha + beta) phase region drawing-out pre-deformation and (alpha + beta) phase region low-speed isothermal forging. A hierarchical structure induced by interaction of a lamella alpha and a matrix beta in a high-temperature deformation process of a near-beta type titanium alloy is fully utilized to realize refining of coarse beta grains; and strong crystal rotation driven by large plastic deformation accelerates alpha lamellar structure form transformation, the orientation concentration degree of the matrix is weakened, a weak texture structure is obtained, and finally, the overall performance of the near-beta titanium alloy thin-wall structural part is increased. The near-beta type titanium alloy thin-wall structural part forming method capable of effectively achieving microstructure regulation and control provided by the invention has the characteristics of being short in technological process, low in equipment requirement, good in technological stability and high in forming efficiency and material utilization rate, and is capable of achieving mass production.

Description

technical field [0001] The invention belongs to the technical field of plastic forming manufacturing, and in particular relates to a forming method for realizing fine-grained structure of a near-β-type titanium alloy thin-walled structural part. Background technique [0002] Due to its light weight, high strength and high toughness, titanium alloys are widely used in aerospace, medical chemical industry, ship weapons and other fields. Among them, a type of structural parts typified by nearly β-type titanium alloy thin-walled parts is increasing. It plays an incomparable role in the carrying capacity of aircraft equipment and the realization of a jump in overall performance. [0003] For the forming of such high-performance thin-walled components, the key lies in the coordinated control of their macroscopic forming quality, microstructural properties and overall manufacturing cost. The initial β grains of near-β-type titanium alloys are coarse, and it is generally necessary ...

Claims

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Application Information

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IPC IPC(8): B21J5/02B21J1/02C22F1/18
CPCB21J5/02B21J1/025C22F1/183
Inventor 樊晓光王俐詹梅陈强舒大禹
Owner NORTHWESTERN POLYTECHNICAL UNIV
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