A forming method for realizing microstructure refinement of near β-type titanium alloy thin-walled structural parts

A technology of thin-walled structural parts and titanium alloys, applied in metal processing equipment and other directions, can solve the problems of difficult microstructure control and difficult control of forming stability, and achieve the effects of shortened development cycle, fine grain size and efficient manufacturing.

Active Publication Date: 2022-07-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • 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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  • A forming method for realizing microstructure refinement of near β-type titanium alloy thin-walled structural parts
  • A forming method for realizing microstructure refinement of near β-type titanium alloy thin-walled structural parts
  • A forming method for realizing microstructure refinement of near β-type titanium alloy thin-walled structural parts

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Embodiment 1

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

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

[0043] The TB6 titanium alloy bar with Φ90mm specification is used, and the phase transition temperature is 805°C. The TB6 titanium alloy bar was put into a vacuum heat treatment furnace for multi-stage heat treatment to obtain a lamellar structure. The cooling rate of the bar is furnace-cooled to 750 ° C, and the temperature is continued for 40 minutes; after the heat preservation, the bar is furnace-cooled to room temperature.

[0044] A TB6 titanium alloy bar that has undergone multi-stage heat treatment is obtained. Its microstructure is figure 2 As shown, the average β grain size is 213 μm, the average grain boundary α size is 2.5 μm, and the average thickness of the α sheet inside the β grain is 1 μm.

[0045] ...

Embodiment 2

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

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

[0063] Ti-55531 titanium alloy bar with Φ90mm specification is used, and the phase transition temperature is 845℃. The Ti55531 titanium alloy bar was put into a vacuum heat treatment furnace for multi-stage heat treatment to obtain a lamellar structure. The cooling rate of the bar is furnace-cooled to 650 ℃, and the temperature is kept for 50 minutes; after the heat preservation, the bar is furnace-cooled to room temperature.

[0064] A Ti-55531 titanium alloy bar that has undergone multi-stage heat treatment is obtained. Its microstructure is Figure 5 As shown, the average β grain size is 225 μm, the average grain boundary α size is 2 μm, and the thickness of the α sheet inside the β grain is 0.8 μm.

[00...

Embodiment 3

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

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

[0083] Ti-7333 titanium alloy bar with Φ90mm specification is used, and the phase transition temperature is 850℃. The Ti-7333 titanium alloy bar was put into a vacuum heat treatment furnace for multi-stage heat treatment to obtain a lamellar structure. The bar was furnace-cooled to 700°C at a cooling rate of min, and kept for 30 minutes under this condition; after the heat preservation, the bar was furnace-cooled to room temperature.

[0084] A Ti-7333 titanium alloy bar that has undergone multi-stage heat treatment is obtained. Its microstructure is Figure 7 As shown in the figure, the average β grain size is 230 μm, the average grain boundary α size is 2.1 μm, and the average thickness of the α sheet insid...

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Abstract

A forming method for realizing microstructure fine-graining of near-β-type titanium alloy thin-walled structural parts. +β) The low-speed isothermal forging process in the phase region makes full use of the hierarchical structure induced by the interaction of the lamellar α and matrix β phases during the high-temperature deformation process of the near-β-type titanium alloy to achieve the refinement of the coarse β grains; driven by large plastic deformation Strong crystal rotation accelerates the morphological transformation of α lamellae, weakens the orientation concentration of the matrix to obtain a weak texture structure, and finally achieves a jump in the overall performance of near-β titanium alloy thin-walled structural parts. The invention can effectively realize the forming method of near-beta type titanium alloy thin-walled structural parts controlled by microstructure, and has the characteristics of short process flow, low equipment requirements, good process stability, high forming efficiency and material utilization rate, and can realize mass production production.

Description

technical field [0001] The invention belongs to the technical field of plastic forming and manufacturing, and particularly relates to a forming method for realizing the microstructure of a near-beta type titanium alloy thin-walled structural member. Background technique [0002] Due to its light weight, high strength and high toughness, titanium alloys are widely used in aerospace, medical chemical industry, naval weapons and other fields. Among them, a class of structural parts represented by near-beta titanium alloy thin-walled parts is increasing. It has an incomparable role in the carrying capacity of aircraft equipment and the realization of the overall efficiency jump. [0003] For the forming of such high-performance thin-walled components, the key lies in the coordinated control of its macroscopic forming quality, microstructure properties and overall manufacturing cost. The initial β grains of near-β-type titanium alloys are coarse. Generally, thermal deformation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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