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Beta titanium alloy and preparation method thereof

A technology of beta titanium alloy and alloy material, applied in the field of low cost and high strength beta titanium alloy and its preparation, can solve the problems of high price and high melting point, and achieve the effect of low cost and high strength

Inactive Publication Date: 2010-11-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has high strength and high plasticity, the tensile strength is 1060-1200MPa, and the shrinkage rate can reach 30%-50%, but the alloy contains tantalum, a precious metal with a high melting point and expensive price.

Method used

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  • Beta titanium alloy and preparation method thereof
  • Beta titanium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: Preparation of Ti-1.5Fe-2Al-4Cr-8Nb titanium alloy

[0025] Put the spongy titanium into the non-consumable vacuum electric arc furnace first, and evacuate to 5×10 -3 Pa, filled with high-purity argon to 0.7×10 5 After Pa, flip and smelt twice. Then put the high-purity iron, aluminum, chromium, niobium and previously smelted titanium into the non-consumable vacuum electric arc furnace after weighing and cleaning, and repeat the smelting for 5 times according to the previous method with magnetic stirring to obtain β titanium alloy ingot. Put the β titanium alloy ingot obtained above into a vacuum heat treatment furnace for homogenization heat treatment, and the vacuum degree is 5×10 -3 Pa, after heat treatment at 900°C for 24 hours, cool with the furnace. The heat-treated β-titanium alloy ingot is hot-rolled at 700° C., and hot-rolled into a sheet-shaped alloy material with a thickness of 1 mm. The alloy sheet obtained above was cut into dumbbell-shape...

Embodiment 2

[0027] Embodiment 2: Preparation of Ti-2.5Fe-1.5Al-2Cr-11Nb titanium alloy

[0028] Put the spongy titanium into the non-consumable vacuum electric arc furnace first, and evacuate to 5×10 -3 Pa, filled with high-purity argon to 0.7×10 5 After Pa, flip and smelt twice. Then put the high-purity iron, aluminum, chromium, niobium and previously smelted titanium into the non-consumable vacuum electric arc furnace after weighing and cleaning, and repeat the smelting for 5 times according to the previous method with magnetic stirring to obtain β titanium alloy ingot. Put the β titanium alloy ingot obtained above into a vacuum heat treatment furnace for homogenization heat treatment, and the vacuum degree is 5×10 -3Pa, after heat treatment at 1000°C for 12 hours, cool with the furnace. The heat-treated β-titanium alloy ingot is hot-rolled at 800° C., and hot-rolled into a sheet-shaped alloy material with a thickness of 1 mm. The alloy sheet obtained above was cut into dumbbell-sh...

Embodiment 3

[0030] Embodiment 3: Preparation of Ti-0.5Fe-3.5Al-3Cr-6Nb titanium alloy

[0031] Put the spongy titanium into the non-consumable vacuum electric arc furnace first, and evacuate to 5×10 -3 Pa, filled with high-purity argon to 0.7×10 5 After Pa, flip and smelt twice. Then put the high-purity iron, aluminum, chromium, niobium and previously smelted titanium into the non-consumable vacuum electric arc furnace after weighing and cleaning, and repeat the smelting for 5 times according to the previous method with magnetic stirring to obtain β titanium alloy ingot. Put the β titanium alloy ingot obtained above into a vacuum heat treatment furnace for homogenization heat treatment, and the vacuum degree is 5×10 -3 Pa, after heat treatment at 900°C for 24 hours, cool with the furnace. The heat-treated β-titanium alloy ingot is hot-rolled at 800° C., and hot-rolled into a sheet-shaped alloy material with a thickness of 1 mm. The alloy sheet obtained above was cut into dumbbell-sha...

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Abstract

The invention relates to a beta titanium alloy, in particular to a beta titanium alloy with low cost and high strength and a preparation method thereof. The beta titanium alloy comprises the following components in mass percentage: 0.5%-2.5% of ferrum, 1.5%-3.5% of aluminum, 2%-4% of chromium, 6%-11% of niobium and the balance of titanium. The preparation method comprises the following steps of: smelting sponge-state titanium and then smelting the smelted titanium with ferrum, aluminum, chromium and niobium to obtain a beta titanium alloy ingot; and cooling the beta titanium alloy ingot along with a furnace after uniform heat treatment, hot rolling the cooled beta titanium alloy ingot into a sheet alloy material, cutting the sheet alloy material into samples, carrying out ice water quenching after solution treatment and then carrying out ageing treatment to obtain the beta titanium alloy with high strength. The results of stretching experiments indicate that the room-temperature tensile strength of the beta titanium alloy in the solution state is above 850 MPa, and the elongation is above 15%; and the room-temperature tensile strength of the beta titanium alloy in the ageing state is above 1300 MPa, the elongation is above 4%, the strength of the beta titanium alloy can achieve above 1300 MPa, and meanwhile, the beta titanium alloy keeps a certain plasticity.

Description

technical field [0001] The invention relates to a titanium alloy, in particular to a low-cost and high-strength beta titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloys are known as "magic" metals or "magic" metals for their high specific strength, strong corrosion resistance, and good heat and cold resistance. They have been used in aerospace, marine power generation, and chemical metallurgy. Because of its expensive price, it cannot be widely used in people's daily life. But its potential prospects are immeasurable, such as marine divers and rock climbing enthusiasts, lightweight, high-strength and corrosion-resistant appliances are their first choice, and in the field of sports, lightweight, high-strength titanium alloys can also be used as rugby players helmet face protection Materials and bicycle materials, etc. But what must be solved is to reduce the cost of titanium alloys so that titanium alloys can enter people's lives. ...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18
Inventor 马云庆刘旭亮杨水源张欣桥施展黄艺雄张锦彬王翠萍刘兴军
Owner XIAMEN UNIV
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