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High-strength and high-plasticity alpha-beta titanium alloy and preparation method thereof

A titanium alloy and high-strength technology, which is applied in the field of high-strength and high-plastic α+β-type titanium alloy and its preparation, can solve the problems of reducing the specific strength, strength, and plastic variation of secondary alloys, and is not suitable for practical applications, and achieves a reduction in Grain size, effect of improving tensile strength

Inactive Publication Date: 2018-03-02
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0002] At present, the widely used commercial high-strength α+β-type titanium alloy mainly composed of titanium is Ti62222S (Ti 6 Al 2 sn 2 Mo 2 Cr 2 Zr 0.25 Si)Ti-6242(Ti 6 Al 2 sn 4 Zr 6 Mo) and BT23 (Ti 5 Al 4.5 V 2 Mo 1 Cr 0.6 Fe) The strength of these alloys is mainly 1100-1200Mpa, and the alloy strength is low; in addition, the α+β-type titanium alloy mainly composed of double alloy elements under development has extremely high cost, such as the patent No. 201310541532.1, "a titanium-zirconium-based Alloy preparation method "the weight percent of alloying elements contained in the titanium alloy is: Al: 5%; V: 3%; Zr: 30%-51%; although the tensile strength of its alloy (micron size detection) has reached At 1500Mpa level, the elongation (micron size detection) reaches 7-8%. However, the Zr content in this alloy is very high, even exceeding 50%. It is a Ti-Zr alloy rather than a titanium alloy in the traditional sense. Due to Zr The density is higher, and the high Zr content will reduce the specific strength of the alloy (that is, the strength of the alloy under the same weight); and Zr has high cost, and the high Zr content will inevitably lead to an increase in the cost of the alloy
In addition, in the processing method and performance testing method introduced in the patent, it is mentioned that the samples and tensile samples provided by the alloy are samples with a thickness of 0.3 mm (300 μm), which have reached the micron level. As we all know, metal materials exist The size effect is ubiquitous, that is, when the size of the alloy decreases to a certain critical size (usually micron level) or below, usually the strength, plasticity and other properties will have a large change (usually the strength and plasticity will be greatly improved), so the patent said It is unlikely that the alloys described above will perform as well in normal sized samples as they do in micron sized samples.
Furthermore, samples of this size are not suitable for practical applications
According to the information provided by the patent, its performance advantages are mainly due to its complex thermal processing process, that is, rolling at room temperature, and room temperature rolling has high requirements on the rolling mill and slow efficiency, which is undoubtedly also increased cost

Method used

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  • High-strength and high-plasticity alpha-beta titanium alloy and preparation method thereof
  • High-strength and high-plasticity alpha-beta titanium alloy and preparation method thereof
  • High-strength and high-plasticity alpha-beta titanium alloy and preparation method thereof

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Embodiment 1

[0030] The high-strength and high-plastic α+β-type titanium alloy of this embodiment includes the following chemical elements in weight percentage: Zr: 25wt.%, Al: 6wt.%, V: 4wt.%, O: ≤0.2wt.%, C: ≤0.08wt.%, N: ≤0.05wt.%, the balance being titanium and unavoidable impurities.

[0031] The preparation method of the high-strength and high-plasticity α+β-type titanium alloy of the above-mentioned present embodiment is as follows:

[0032] Weigh sponge titanium, Al-V master alloy, pure Al, and pure Zr according to the above proportions, wherein titanium is provided by sponge titanium, V is provided by Al-V master alloy, Al is provided by pure Al and Al-V master alloy, and Zr The mixed raw materials are provided by pure Zr; the components are mixed according to the design and then pressed into electrodes, and the electrodes are melted in a vacuum consumable arc melting furnace for secondary preparation to obtain alloy ingots with a diameter of 160 mm, which are then used in free fo...

Embodiment 2

[0036] The high-strength and high-plastic α+β-type titanium alloy of this embodiment includes the following chemical elements in weight percentage: Zr: 25wt.%, Al: 6wt.%, V: 4wt.%, O: ≤0.2wt.%, C: ≤0.08wt.%, N: ≤0.05wt.%, the balance being titanium and unavoidable impurities.

[0037] The preparation method of the above-mentioned high-strength and high-plasticity α+β-type titanium alloy in this embodiment is as follows: weigh sponge titanium, Al-V master alloy, pure Al, and pure Zr according to the above ratio, wherein, titanium is provided by sponge titanium, and V is provided by Provided by Al-V master alloy, Al is provided by pure Al and Al-V master alloy, Zr is provided by pure Zr to obtain mixed raw materials; after mixing according to the design composition, it is pressed into electrodes, and the electrodes are melted in a vacuum consumable arc melting furnace Alloy ingots with a diameter of 160mm were obtained through secondary preparation, and blank forging was carried...

Embodiment 3

[0040] The high-strength and high-plastic α+β-type titanium alloy of this embodiment includes the following chemical elements in weight percentage: Zr: 25wt.%, Al: 6wt.%, V: 4wt.%, O: ≤0.2wt.%, C: ≤0.08wt.%, N: ≤0.05wt.%, the balance being titanium and unavoidable impurities.

[0041] The preparation method of the high-strength and high-plasticity α+β-type titanium alloy of the above-mentioned present embodiment is as follows:

[0042] Weigh sponge titanium, Al-V master alloy, pure Al, and pure Zr according to the above proportions, wherein titanium is provided by sponge titanium, V is provided by Al-V master alloy, Al is provided by pure Al and Al-V master alloy, and Zr The mixed raw material is provided by pure Zr; after mixing according to the design components, it is pressed into an electrode, and the electrode is smelted in a vacuum consumable arc melting furnace to obtain an alloy ingot with a diameter of 160 mm), which is freely forged in a hydraulic press or a forging ...

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Abstract

The present invention discloses a high-strength and high-plasticity alpha-beta titanium alloy and a preparation method thereof, wherein the titanium alloy comprises, by weight, 20-30% of Zr, 4.5-7.5%of Al, 3-5% of V, less than or equal to 0.2% of O, less than or equal to 0.08% of C, less than or equal to 0.05% of N, and the balance of titanium and unavoidable impurities. The preparation method comprises: mixing titanium sponge, an Al-V intermediate alloy, pure Al and pure Zr according to a certain ratio, and pressing to form an electrode; carrying out two smelting to prepare a Ti-Al-Zr-V alloy casting ingot; cogging, and carrying out first forging to obtain a large-size forging member; carrying out second forging to obtain a large-size bar; carrying out third forging to obtain a small size bar; carrying out solid solution treatment, and carrying out air cooling; and carrying out aging treatment, and carrying out air cooling. According to the present invention, the obtained high-strength and high-plasticity alpha-beta titanium alloy has advantages of low cost, high strength, high plasticity and the like.

Description

technical field [0001] The invention relates to the technical field of metal material preparation and processing, and in particular relates to a high-strength and high-plasticity α+β-type titanium alloy and a preparation method thereof. Background technique [0002] At present, the widely used commercial high-strength α+β-type titanium alloy mainly composed of titanium is Ti62222S (Ti 6 Al 2 sn 2 Mo 2 Cr 2 Zr 0.25 Si)Ti-6242(Ti 6 Al 2 sn 4 Zr 6 Mo) and BT23 (Ti 5 Al 4.5 V 2 Mo 1 Cr 0.6 Fe) The strength of these alloys is mainly 1100-1200Mpa, and the alloy strength is low; in addition, the α+β-type titanium alloy mainly composed of double alloy elements under development has extremely high cost, such as the patent No. 201310541532.1, "a titanium-zirconium-based Alloy preparation method "the weight percent of alloying elements contained in the titanium alloy is: Al: 5%; V: 3%; Zr: 30%-51%; although the tensile strength of its alloy (micron size detection) has rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C1/03C22C14/00C22F1/183
Inventor 刘立斌吴迪章立钢王振宇盛金文
Owner CENT SOUTH UNIV
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