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A low-cost near-β-type high-strength titanium alloy containing Fe and its preparation method

A titanium alloy, low-cost technology, applied in the field of low-cost near β-type high-strength titanium alloys, can solve the problems of difficulty in ensuring composition uniformity and increase in alloy cost, and achieve the effects of accelerating aging response speed, improving strength and reducing costs.

Active Publication Date: 2018-08-24
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The titanium alloy maintains the good mechanical properties of the nearly β-type titanium alloy, and only a small amount of expensive element V is added, which reduces the production cost of the alloy to a certain extent. However, the alloy contains Ti, Al, V, Mo, Cr , Zr, Sn, Fe and other eight elements increase the cost of alloy smelting, and it is difficult to ensure the uniformity of its composition

Method used

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  • A low-cost near-β-type high-strength titanium alloy containing Fe and its preparation method
  • A low-cost near-β-type high-strength titanium alloy containing Fe and its preparation method
  • A low-cost near-β-type high-strength titanium alloy containing Fe and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The nominal composition of the titanium alloy in this embodiment is Ti-4Al-5Mo-2Fe-4Cr-2Zr, and the proportions by weight percentage are Al: 4%, Mo: 5%, Fe: 2%, Cr: 4%, Zr: 2%, The balance is Ti and unavoidable impurities.

[0045] Put the raw material sponge titanium, Al-Mo master alloy, elemental iron, electrolytic chromium and sponge zirconium into the vacuum suspension melting furnace, and vacuum to 5×10 -3 Below Pa, then charge 0.5×10 5 Pa high-purity argon (purity 99.999%) protective gas, first smelted at 1700°C to 1800°C for 10 minutes to obtain a crude ingot.

[0046] After the alloy is cooled, open the furnace door, turn the crude ingot upside down, and perform a secondary smelting to fully dissolve the alloy elements. The temperature and time of the secondary smelting are the same as the first one. Repeat the smelting three times to ensure uniform structure and cast The ingot is an 80mm round ingot, which is a fine ingot casting.

[0047] Remove the head and tail of...

Embodiment 2

[0053] The nominal composition of the titanium alloy in this embodiment is Ti-5Al-5Mo-2Fe-4Cr-3Zr, and the proportions by weight percentage are Al: 5%, Mo: 5%, Fe: 2%, Cr: 4%, Zr: 3%, The balance is Ti and unavoidable impurities.

[0054] Put the raw material sponge titanium, Al-Mo master alloy, elemental iron, electrolytic chromium and sponge zirconium into the vacuum suspension melting furnace, and vacuum to 5×10 -3 Below Pa, then charge 0.7×10 5 The high-purity argon gas (purity 99.999%) of Pa is a protective gas, and the first smelting is performed at about 1700°C to 1800°C for 10 minutes to obtain a crude ingot.

[0055] After the alloy is cooled, open the furnace door, turn the crude ingot upside down, and perform a secondary smelting to fully dissolve the alloy elements. The temperature and time of the secondary smelting are the same as the first one. Repeat the smelting three times to ensure uniform structure and cast The ingot is an 80mm round ingot, which is a fine ingot ...

Embodiment 3

[0062] The nominal composition of the titanium alloy in this embodiment is Ti-3Al-5Mo-0.5Fe-4Cr-2Zr, and the proportions by weight percentage are Al: 3%, Mo: 5%, Fe: 0.5%, Cr: 4%, Zr: 2% , The balance is Ti and unavoidable impurities.

[0063] Put the raw material sponge titanium, Al-Mo master alloy, elemental iron, electrolytic chromium and sponge zirconium into the vacuum suspension melting furnace, and vacuum to 5×10 -3 Below Pa, then charge 0.6×10 5 The high-purity argon gas (purity 99.999%) of Pa is a protective gas, and the first smelting is performed at about 1700°C to 1800°C for 10 minutes to obtain a crude ingot.

[0064] After the alloy is cooled, open the furnace door, turn the ingot upside down, and perform a secondary smelting to fully dissolve the alloy elements. The temperature and time of the secondary smelting are the same as the first one. Repeat the smelting three times to ensure uniform structure and ingot casting. It is an 80mm round ingot, which is a fine ingo...

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Abstract

The invention discloses a low-cost high-strength Fe-containing near-Beta titanium alloy. The titanium alloy is characterized by comprising the following alloy elements in percentage by weight: 2.5%-5.5% of Al; 0.5%-2.2% of Fe; 4.7%-5.7% of Mo; 3.5%-4.5% of Cr; 1.5%-3.5% of Zr; and Ti and inevitable impurities in balancing amount. According to the titanium alloy, cheap elements such as Fe, Al and Zr are employed to replace expensive elements such as V on the basis that the mechanical properties of the titanium alloy are guaranteed, so that the cost of the titanium alloy is greatly reduced.

Description

Technical field [0001] The application relates to a low-cost near-beta high-strength titanium alloy containing Fe, which belongs to the field of preparation and processing of metal materials. Background technique [0002] It is known in the prior art that titanium and titanium alloys belong to high-strength, corrosion-resistant lightweight alloys, and they also have good high temperature and low temperature resistance. Therefore, titanium and titanium alloys are widely used in aerospace, petrochemical and marine equipment, etc. field. The beta titanium alloy provides the highest specific strength among titanium alloys due to its high strength and high toughness. Therefore, beta titanium alloy occupies a considerable share in certain applications such as large aircraft landing gear and structural parts. [0003] Commercial β-titanium alloys currently widely used include VT22, Ti-15-3, Ti-10-2-3, β21S, etc. These alloys have added a certain amount of V element (of which 5% V, Ti- 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C1/03C22C14/00C22F1/183
Inventor 常辉李佳佳高桦董月成李栋倪宏健周廉
Owner NANJING TECH UNIV