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Low-cost high-strength alpha+beta titanium alloy and preparation method thereof

A β-titanium alloy, low-cost technology, applied in the field of titanium alloy processing, can solve the problem of plastic elongation reduction, etc., to achieve the effect of low cost, uniform alloy composition, and simple preparation process

Inactive Publication Date: 2018-11-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comparing Example 6 and Example 7, it was found that when Cr and Fe element content were substantially constant, the Al content changed from 0 to 3%, the tensile strength changed from 950MPa to 1090MPa, the yield strength changed from 890MPa to 1020MPa, and the elongation From 18% to below 12%, in several examples in this application, the addition of B increases the room temperature tensile strength and room temperature yield strength of the alloy, but the plastic elongation drops to about 11%

Method used

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  • Low-cost high-strength alpha+beta titanium alloy and preparation method thereof
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  • Low-cost high-strength alpha+beta titanium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The alloy composition is Ti-3wt%Al-3.5wt%Fe-0.1wt%B(K β =0.7), the temperature of the phase transition point is about 900°C, mix the purchased sponge titanium, Fe-B master alloy, pure iron particles, and pure aluminum particles according to the ratio of 900g for each ingot, and then put them into the cold crucible for suspension In the water-cooled copper crucible of the smelting furnace, a certain amount of high-purity argon gas is introduced after the furnace body is evacuated, and the alloy is first smelted at 1600°C for 10 minutes. After the ingot is fully cooled, turn the ingot upside down and put it into a water-cooled copper crucible for re-melting to homogenize the alloy composition. After repeating this for 3-5 times, the phase transition temperature of the ingot is measured, and then the ingot The blank is forged at 50-200 °C above the change point to form a regular-shaped plate. The plate was kept at 870°C for 1 hour, then air-cooled to room temperature, and...

Embodiment 2

[0032] The alloy composition is Ti-3wt%Al-3wt%Fe-0.1wt%B(K β=0.6), the temperature of the phase transition point is about 908°C, mix the purchased sponge titanium, Fe-B master alloy, pure iron particles, and pure aluminum particles according to the ratio of 900g for each ingot, and then put them into the cold crucible for suspension In the water-cooled copper crucible of the smelting furnace, a certain amount of high-purity argon gas is introduced after the furnace body is evacuated, and the alloy is first smelted at 1600°C for 10 minutes. After the ingot is fully cooled, turn the ingot upside down and put it into a water-cooled copper crucible for re-melting to homogenize the alloy composition. After repeating this for 3-5 times, the phase transition temperature of the ingot is measured, and then the ingot The blank is forged at 50-200°C above the change point to form a regular-shaped plate. The plate was kept at 878°C for 1 hour, then air-cooled to room temperature, and the...

Embodiment 3

[0038] The alloy composition is Ti-3wt%Al-3.5wt%Fe-0.15wt%B(K β =0.7), the temperature of the phase transition point is about 900°C, mix the purchased sponge titanium, Fe-B master alloy, pure iron particles, and pure aluminum particles according to the ratio of 900g for each ingot, and then put them into the cold crucible for suspension In the water-cooled copper crucible of the smelting furnace, a certain amount of high-purity argon gas is introduced after the furnace body is evacuated, and the alloy is first smelted at 1600°C for 10 minutes. After the ingot is fully cooled, turn the ingot upside down and put it into a water-cooled copper crucible for re-melting to homogenize the alloy composition. After repeating this for 3-5 times, the phase transition temperature of the ingot is measured, and then the ingot The blank is forged at 50-200°C above the change point to form a regular-shaped plate. The plate was kept at 870°C for 1 hour, then air-cooled to room temperature, and...

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Abstract

The invention provides low-cost high-strength alpha+beta titanium alloy. The titanium alloy takes titanium as a main body element, and takes alpha stable elements, namely, Al and B, and beta stable element, namely, Fe, as alloy elements; and the titanium alloy is prepared from the following components in percentage by weight: 2.5 to 4.5 percent of Al, 2.5 to 4 percent of Fe, 0.05 to 0.2 percent ofB, and the balance of titanium and unavoidable impurities. The invention also provides a preparation method of the low-cost high-strength alpha+beta titanium alloy; the preparation method comprises the following steps: adding raw materials into a water-cooled crucible suspension melting furnace into which argon gas is introduced according to a designed proportion alloy component proportion; obtaining an ingot casting after repeated melting; cogging and forging above a phase transition point; sampling a forged alloy and performing heat treatment; and finally, characterizing tissue structures and performance. The prepared titanium alloy is uniform in alloy components and fine in tissues; the tensile strength is greater than or equal to 1,000 MPa, and the plastic elongation percentage is greater than or equal to 15 percent; and the alloy has the advantages of low cost and high strength, and can replace part expensive titanium alloys in certain fields.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a low-cost high-strength α+β titanium alloy and a preparation method thereof. Background technique [0002] Since the 1950s, due to the urgent needs of aerospace technology, the titanium industry has developed rapidly. Today, titanium and titanium alloys are not only indispensable structural materials in the aerospace industry, but also widely used in chemical industry, metallurgy, and medical treatment. In recent years, my country has vigorously developed the field of marine engineering, and titanium and titanium alloys have broad application prospects in marine engineering due to their excellent corrosion resistance. Compared with aerospace, marine engineering has more low-cost requirements for titanium alloys. urgent. [0003] High-strength titanium alloy is a titanium alloy with room temperature tensile strength between 800 and 1400 MPa, mainly ...

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 常辉刘畅董月成郭艳华孙洋洋张堂俊周廉
Owner NANJING UNIV OF TECH
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