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Low-cost medium-strength titanium alloy material and preparation method thereof

A titanium alloy, low-cost technology, applied in the field of high-strength titanium alloy materials and its preparation, can solve the problems of increased manufacturing costs, restrictions on large-scale promotion and application, unfavorable promotion and use of titanium alloy materials in a wide range, and achieve the effect of low price

Inactive Publication Date: 2019-01-11
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high cost of titanium alloy materials has seriously restricted its large-scale promotion and application in industries such as ships, weapons, chemicals, and energy. Especially since 2018, the growth rate of Al-V, Al-Mo and other intermediate alloys has reached 200%. , taking Ti-6Al-4V titanium alloy, which is currently the most widely used, as an example, the price increase of Al-V master alloy has caused its manufacturing cost to further increase by about 20%, which is not conducive to the promotion and use of titanium alloy materials on a large scale. Impact

Method used

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  • Low-cost medium-strength titanium alloy material and preparation method thereof
  • Low-cost medium-strength titanium alloy material and preparation method thereof
  • Low-cost medium-strength titanium alloy material and preparation method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned low-cost medium-strength titanium alloy material comprises the following steps:

[0026] 1) According to the mass percentage of the components: Al: 3.0% ~ 5.5%, Fe: 0.4% ~ 2.0%, O: 0.06% ~ 0.50%, Si: 0.05% ~ 0.35%, the balance is titanium and unavoidable Impurities, wherein the weight percentage of impurities is: C: ≤0.05%, N: ≤0.03%, H: ≤0.015%, weighed and mixed, and pressed by a press to form an electrode block;

[0027] 2) Using ion welding or vacuum electron beam welding, the pressed electrode blocks are welded into strip electrodes; among them, the ion welding is vacuum plasma welding or argon shielded ion welding.

[0028] 3) Using the strip electrode prepared in step 2) as a consumable electrode to melt in a vacuum consumable electric arc furnace to obtain a primary ingot; wherein, the melting current is 5-23KA, and the melting voltage is 26-40V.

[0029] 4) Invert the primary ingot and use it as a consumable electr...

Embodiment 1

[0037] Preparation of 300Kg grade Ti-3.0Al-2.0Fe-0.5O-0.35Si alloy ingot and bar:

[0038] (1) Ingredients and electrode pressing:

[0039] Select first-grade sponge titanium, Fe chips, Al beans, titanium dioxide and titanium-silicon alloy, weigh and mix materials according to the above-mentioned composition ratio, and press them into block electrodes.

[0040] (2) Electrode preparation:

[0041] A vacuum plasma welding machine is used to weld the pressed electrode blocks into long strip electrodes.

[0042] (3) Prepare primary ingot

[0043] Use the electrode prepared in the previous step as the consumable electrode to melt in a vacuum consumable electric arc furnace to obtain a primary ingot, the melting current is 5-7KA, and the melting voltage is 26-32V.

[0044] (4) Preparation of ingot

[0045] The primary ingot is turned upside down and used as a consumable electrode for secondary melting in a vacuum consumable electric arc furnace to obtain a finished ingot. The me...

Embodiment 2

[0066] Preparation of 1000Kg grade Ti-5.5Al-0.4Fe-0.06O-0.05Si alloy ingot and its forging:

[0067] (1) Ingredients and electrode pressing:

[0068] Select first-grade sponge titanium, Fe chips, Al beans, titanium dioxide and titanium-silicon alloy, weigh and mix materials according to the above-mentioned composition ratio, and press them into block electrodes.

[0069] (2) Electrode preparation:

[0070] A vacuum plasma welding machine is used to weld the pressed electrode blocks into long strip electrodes.

[0071] (3) Prepare primary ingot

[0072] The electrode prepared in the previous step is used as the consumable electrode to melt in a vacuum consumable electric arc furnace to obtain a primary ingot, the melting current is 8-10KA, and the melting voltage is 26-32V.

[0073] (4) Preparation of ingot

[0074] The primary ingot is turned upside down and used as a consumable electrode for secondary melting in a vacuum consumable electric arc furnace to obtain a finishe...

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Abstract

The invention relates to a low-cost medium-strength titanium alloy material and a preparation method thereof. The method comprises the following steps that sponge titanium, Fe chips, Al shots, titanium dioxide and titanium-silicon alloy are weighed and mixed, and the mixture is pressed into electrode blocks; ion welding or vacuum electron beam welding is adopted, and the pressed electrode blocks are welded into strip-shaped electrodes; the prepared strip-shaped electrodes are used as a consumable electrode to be smelted in a vacuum self-consuming electric arc furnace, and a primary ingot is obtained; the primary ingot is inverted and serves as a consumable electrode, then secondary smelting is carried out in a vacuum self-consuming electric arc furnace, and a secondary ingot is obtained; after the secondary ingot is cooled, the secondary ingot is heated, and cogging forging is carried out to obtain a blank; and after the blank is heated, rod materials or plate blanks are obtained through multiple forging. According to the preparation method, the low-cost Fe element is adopted to replace the high-cost V element and Mo element and is used as an alloy reinforcing agent, the manufacturing cost of the alloy can be reduced by 12% to 20%, and the tensile strength of the prepared titanium alloy material, rod materials, plate materials and forged parts ranges from 700 MPa to 950 MPa, and the elongation percentage is 8% to 25%.

Description

technical field [0001] The invention belongs to the field of titanium alloy material manufacturing, and relates to a low-cost medium-strength titanium alloy material and a preparation method thereof, which are applied in ship manufacturing, weapon equipment manufacturing, chemical energy manufacturing, electronic instrument manufacturing and other industries. Background technique [0002] Due to its relatively low density, high specific strength, good high temperature performance, excellent corrosion resistance and anti-electromagnetic performance, titanium alloy materials are ideal metal structural materials for aviation, aerospace, ships, weapons, chemicals and other industrial fields. It has been widely used in high-end industrial fields such as aviation and aerospace. At present, the alloying elements commonly used in medium-strength titanium alloys mainly include Al, Mo, V, Zr, Nb, etc. Due to the relatively high cost of raw materials such as Mo, V, Zr, and Nb, the pric...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02C22B9/20
CPCC22B9/20C22C1/02C22C14/00
Inventor 薛祥义张利军周中波刘娣吴天栋
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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