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In-situ synthesized TiB reinforced beta titanium alloy composite, and preparation method thereof

A technology of titanium-based composite materials and β-titanium alloys, which is applied in the field of in-situ self-generated TiB-reinforced β-titanium alloy composite materials and its preparation, can solve the problems of increasing the difficulty of plastic deformation, restricting the development and application of alloys, and uneven deformation. Achieve the effect of reducing the risk of crack initiation, effective refinement and uniform distribution, high stiffness and good matching

Active Publication Date: 2021-06-29
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, the research on titanium-based composites in the industry is centered around α and α+β titanium alloys. There are few reports on titanium-based composites based on β-titanium alloys, and the potential of mechanical properties of β-titanium alloys has not been fully explored. and development
In addition, the plastic deformation resistance of β-titanium alloy is relatively large, and the introduction of the reinforcing phase TiB further increases the difficulty of plastic deformation, making it more prone to defects such as tissue cracking and uneven deformation, which restricts the development and application of the alloy.

Method used

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  • In-situ synthesized TiB reinforced beta titanium alloy composite, and preparation method thereof
  • In-situ synthesized TiB reinforced beta titanium alloy composite, and preparation method thereof
  • In-situ synthesized TiB reinforced beta titanium alloy composite, and preparation method thereof

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preparation example Construction

[0043] Figure 4 It is a schematic flow chart of a method for preparing an in-situ self-generated TiB reinforced β-titanium alloy composite material provided by an embodiment of the present invention, and the method includes the following steps:

[0044] S1. Prepare in-situ self-generated TiB reinforced β-titanium alloy and Ti-55531 composite material ingot by using vacuum consumable arc melting method;

[0045] S2. Combining metallographic method to obtain the phase transition point T of the titanium matrix composite ingot α+β / β , performing multi-pass piercing and near-isothermal thermoplastic deformation at the first set temperature;

[0046] S3. Performing multi-pass piercing and near-isothermal thermoplastic deformation and forging on the billet forging blank at the second set temperature;

[0047] S4. Performing multi-pass hot rolling on the modified forging billet at the third set temperature to obtain a titanium-based composite material billet;

[0048] S5. Perform ...

Embodiment 1

[0061] This embodiment is a preparation method of a TiB reinforced β titanium alloy Ti-55531 composite material, and the specific implementation steps are as follows:

[0062] Step 1. The composition of the composite material is designed to be 2vol.%TiB / Ti-55531, and a titanium-based composite material ingot with uniform composition is prepared by using three vacuum consumable arc melting methods, based on Ti and TiB 2 The chemical reaction of the powder realizes the in-situ self-generation of the TiB reinforcement phase.

[0063] Step 2. The phase transition point measured by metallographic method is T α+β / β =855±5°C, three passes of piercing and near-isothermal thermoplastic deformation are carried out at 1100°C, and the temperature of the isothermal forging furnace is kept at 850°C, so that the deformation of the ingot during each pass of piercing deformation is More than 80% and no cracking occurs, and the coarse primary grains and TiB long fibers are broken to the greate...

Embodiment 2

[0068] The difference between this embodiment and embodiment 1 lies in step 3, that is, to select T α+β / β -(10~20)°C temperature range Carry out four times pier drawing near isothermal thermoplastic deformation and modified forging on the blank forging blank. The morphology of the microstructure is as figure 2 shown. The mechanical performance test results are as follows R m =1419.6MPa, R p0.2=1385.1MPa, E=121.3GPa, A=9.3%, achieving a good match of ultra-high strength, high stiffness and plasticity.

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Abstract

The invention relates to an in-situ synthesized TiB reinforced beta titanium alloy composite which comprises TiB and beta titanium alloy, wherein the volume ratio of the TiB is 1%-2.5%, and the beta titanium alloy is Ti-5Al-5Mo-5V-3Cr-1Zr. The invention further relates to a preparation method for the in-situ synthesized TiB reinforced beta titanium alloy composite. The preparation method comprises the following steps of preparing an in-situ synthesized TiB reinforced beta titanium alloy Ti-55531 composite cast ingot by utilizing a vacuum consumable arc melting method; cogging the cast ingot through multi-pass upsetting and drawing near-isothermal thermal plastic deformation; re-forging the cogging forging blank through multi-pass upsetting and drawing near-isothermal thermal plastic deformation; carrying out multi-pass hot continuous rolling on the re-forged blank to obtain a titanium-based composite blank; and performing solid solution heat treatment to the titanium-based composite blank, performing aging heat treatment to the solid solution forging blank to obtain the TiB reinforced beta titanium alloy composite. According to the in-situ synthesized TiB reinforced beta titanium alloy composite and the preparation method thereof, the purpose of achieving good matching of ultrahigh strength, high rigidity and plasticity of beta titanium alloy is achieved.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to an in-situ self-generated TiB reinforced β-titanium alloy composite material and a preparation method thereof. Background technique [0002] Due to a series of advantages such as low density, high specific strength, high specific stiffness, excellent corrosion resistance, and high temperature creep resistance, titanium alloys have been widely used in aviation, aerospace and other fields, and have become the main structure of advanced aircraft and engines. one of the materials. Because of its excellent heat treatment strengthening effect, large hardening depth, good cold and hot workability and excellent fracture toughness, β titanium alloy is an important load-bearing structural part of aircraft outer plates, frames, connectors and fasteners. ideal material. In recent years, under the guidance of design concepts such as lightweight, long life, and high ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C1/02C22C14/00C22C32/00C22F1/18
CPCC22C1/1036C22C14/00C22C32/0073C22F1/183C22C1/1052
Inventor 周琳刘运玺付明杰陈玮王富鑫
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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