Low-cost, high-strength and high-plasticity metastable beta titanium alloy and preparation method thereof

A β-titanium alloy, high-strength technology, applied in the field of low-cost, high-strength, high-plasticity metastable β-titanium alloy and its preparation, can solve the problems of high-cost alloy elements, gaps, low alloy strength, etc., to achieve fine structure, reduce The effect of alloy cost and uniform composition

Inactive Publication Date: 2017-12-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently widely used commercial high-strength near-β titanium alloys include Ti-1023, BT22, and VST5553. These alloys either use a large amount of high-cost Mo%+V%, which has a high cost; or has no obvious price Advantages and low alloy strength
For example, the patent number is 201610934241.2, "a low-cost near-β-type high-strength titanium alloy containing Fe and its preparation method", and the weight percentage of alloying elements contained in the titanium alloy is: Al: 2.5%-5.5%; Fe: 0.5- 2.2%; Mo: 4.7%-5.7%; Cr: 3.5%-4.5%; Zr: 1.5%-3.5%; the cheap element Fe content is low, while the expensive element Mo content is high, and because Mo is a high melting point metal , which undoubtedly increases the cost of alloying elements and smelting costs
For example, the patent number is 201410821718, "a low

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  • Low-cost, high-strength and high-plasticity metastable beta titanium alloy and preparation method thereof
  • Low-cost, high-strength and high-plasticity metastable beta titanium alloy and preparation method thereof
  • Low-cost, high-strength and high-plasticity metastable beta titanium alloy and preparation method thereof

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Experimental program
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Embodiment 1

[0039] The low-cost, high-strength, high-plasticity metastable beta titanium alloy of this embodiment includes the following chemical elements in weight percentages: Fe: 5wt.%, Al: 6wt.%, V: 4wt.%, O: ≤0.2wt.% , C: ≤0.08wt.%, N: ≤0.05wt.%, the balance is titanium and unavoidable impurities.

[0040] The method for preparing the low-cost, high-strength, and high-plasticity metastable beta titanium alloy of this embodiment is as follows:

[0041] Weigh the sponge titanium, Al-V master alloy, pure Al, and pure Fe according to the above ratio. Among them, 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 Fe The mixed raw material is provided by pure Fe; after mixing according to the design composition, 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 160mm (a primary ingot such as figure 1 As shown, the seco...

Embodiment 2

[0044] The low-cost, high-strength, high-plasticity metastable beta titanium alloy of this embodiment includes the following chemical elements in weight percentages: Fe: 5wt.%, Al: 6wt.%, V: 4wt.%, O: ≤0.2wt.% , C: ≤0.08wt.%, N: ≤0.05wt.%, the balance is titanium.

[0045] The method for preparing the low-cost, high-strength, and high-plasticity metastable beta titanium alloy of this embodiment is as follows:

[0046] Weigh sponge titanium, Al-V master alloy, pure Al, and pure Fe according to the above-mentioned ratio. 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 Fe The mixed raw material is provided by pure Fe; it is mixed according to the design composition and 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 160mm, which is used in free forging equipment such as hydraulic press or forging hammer Open b...

Embodiment 3

[0049] The low-cost, high-strength, high-plasticity metastable beta titanium alloy of this embodiment includes the following chemical elements in weight percentages: Fe: 5wt.%, Al: 6wt.%, V: 4wt.%, O: ≤0.2wt.% , C: ≤0.08wt.%, N: ≤0.05wt.%, the balance is titanium.

[0050] The method for preparing the low-cost, high-strength, high-plasticity metastable beta titanium alloy of this embodiment is as follows:

[0051] Weigh sponge titanium, Al-V master alloy, pure Al, and pure Fe according to the above-mentioned ratio. 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 Fe The mixed raw materials are provided by pure Fe; after mixing according to the design components, the electrodes are pressed into electrodes, and the electrodes are smelted in a vacuum consumable arc melting furnace to obtain alloy ingots with a diameter of 160mm, which are used in free forging equipment such as hydraulic presses or forging...

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Abstract

The invention discloses a low-cost, high-strength and high-plasticity metastable beta titanium alloy and a preparation method thereof. The titanium alloy comprises the following components in percentage by weight: 3-7% of Fe, 4-7.75% of Al, 3-5% of V, O not more than 0.2%, C not more than 0.08%, N not more than 0.05%, and the balance of titanium and inevitable impurities. The preparation method comprises the following steps: sponge titanium, an Al-V intermediate alloy, pure Al and pure Fe are weighed according to ratios; the raw materials are mixed to press as an electrode; a Ti-Al-Fe-V alloy cast blank is prepared by secondary smelting; the cogging and the primary forging are performed to obtain a large-scale forging; the secondary forging is performed to obtain a larger-size rod; the ternary forging is performed to obtain a small-size rod; the solid-solution treatment and the air cooling are performed; and then, the aging treatment and the air cooling are performed to obtain the low-cost, high-strength and high-plasticity metastable beta titanium alloy. The titanium alloy contains higher-content beta elements and stable elements Fe, and has such advantages as low cost, high strength and high plasticity.

Description

Technical field [0001] The invention belongs to the technical field of metal material preparation and processing, and particularly relates to a low-cost, high-strength, high-plasticity metastable beta titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength, high specific rigidity, corrosion resistance, good high and low temperature performance and biological compatibility. Therefore, as an ideal structural material and functional material, it is widely used in aerospace, ship manufacturing, petrochemical industry , Marine engineering, biomedicine and architectural decoration and other fields, and have obtained good economic and social benefits. [0003] Commercial high-strength near-beta titanium alloys currently widely used include Ti-1023, BT22, and VST5553. These alloys either use a larger content of high-cost Mo%+V%, which has a higher cost; or there is no obvious price. Advant...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C14/00C22C1/03C22F1/183
Inventor 刘立斌吴迪章立钢王振宇盛金文
Owner CENT SOUTH UNIV
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