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Method for smelting titanium aluminum base alloy

A technology of base alloy and titanium-aluminum, applied in the smelting field of titanium-aluminum-base alloy, can solve the problems of segregation, element residue, hot cracking, etc., and achieve the effect of low hydrogen cost, short time and simple process

Inactive Publication Date: 2014-01-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for smelting a titanium-aluminum-based alloy, which solves the problem that the addition of relevant elements in the existing smelting method will remain in the alloy, resulting in defects such as thermal cracking and segregation, so as to improve the fluidity of the titanium-aluminum-based alloy melt

Method used

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  • Method for smelting titanium aluminum base alloy
  • Method for smelting titanium aluminum base alloy
  • Method for smelting titanium aluminum base alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Vacuumize the non-consumable arc melting furnace to 6×10 -3 Pa, and then feed hydrogen, wherein the partial pressure of hydrogen is 5kPa.

[0031] The titanium-aluminum-based alloy melt is smelted four times: for the first time, 260g of sponge titanium and 130g of pure aluminum are used for smelting, and the titanium-aluminum-based alloy melt is cooled to become an alloy ingot; after the alloy ingot is turned over, Carry out the second smelting, wait for the titanium-aluminum-based alloy melt to cool to become a secondary alloy ingot; after turning over the alloy ingot, perform the third smelting, wait for the titanium-aluminum-based alloy melt to cool to become a tertiary alloy ingot; After turning over the alloy ingot for the third time, the fourth smelting is carried out to obtain a titanium-aluminum-based alloy melt to be cast with uniform composition and superheat. The arc current is gradually increased for each smelting, the maximum arc current is 1300A, and the ...

Embodiment 2

[0034] Vacuumize the non-consumable arc melting furnace alloy melting furnace to 6×10 -3 Pa, then pass into hydrogen, pass into argon while passing into hydrogen, wherein the partial pressure of hydrogen is 10kPa, the partial pressure of argon is 20kPa, and the purity of argon is 99.999%.

[0035] The titanium-aluminum-based alloy melt is smelted four times: for the first time, 260g of sponge titanium and 130g of pure aluminum are used for smelting, and the titanium-aluminum-based alloy melt is cooled to become an alloy ingot; after the alloy ingot is turned over, Carry out the second smelting, wait for the titanium-aluminum-based alloy melt to cool to become a secondary alloy ingot; after turning over the alloy ingot, perform the third smelting, wait for the titanium-aluminum-based alloy melt to cool to become a tertiary alloy ingot; After turning over the alloy ingot for the third time, the fourth smelting is carried out to obtain a titanium-aluminum-based alloy melt to be c...

Embodiment 3

[0038] It includes the step of melting the alloy and the step of introducing hydrogen:

[0039] Alloy melting step: In a water-cooled crucible induction melting furnace, vacuumize to 6×10 -3 Pa, and then directly start smelting titanium-aluminum-based alloys, the raw materials for smelting are 260g sponge titanium and 130g pure aluminum. After the raw materials are completely melted, they are kept warm for 5 minutes to obtain a titanium-aluminum-based alloy melt with uniform composition and superheat.

[0040] The step of feeding hydrogen: vacuumize the water-cooled crucible induction melting furnace to 6×10 -3 Pa, then feed hydrogen, continue smelting the obtained titanium-aluminum-based alloy melt, make hydrogen react with the titanium-aluminum-based alloy melt, feed the partial pressure of hydrogen to be 5kPa, feed the smelting time after hydrogen is 2 minutes, obtain Titanium-aluminum-based alloy melt to be poured.

[0041] After the smelting is completed and the electr...

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Abstract

A method for smelting titanium aluminum alloy belongs to the manufacturing method of titanium aluminum base alloy, solves the problems of element residual, hot crack and segregation of a melting method in the prior art, and improves the liquidity of a titanium aluminum base alloy melt. According to the invention, hydrogen is introduced in the smelting process of the titanium aluminum base alloy to obtain the casting titanium aluminum base alloy melt; and the partial pressure of introduced hydrogen is not less than 5kPa, and action time of hydrogen with the titanium aluminum base alloy melt is not less than 2 min. The invention has the advantages of simple process, low energy consumption, low cost, and easiness for implement in production, effectively improves the liquidity of the titanium aluminum base alloy melt during casting, and is not only applicable to common consumable arc melting and cold crucible induction melting, but also applicable to most casting methods, such as fusible pattern casting, metal mold casting and centrifugation casting.

Description

technical field [0001] The invention belongs to a method for manufacturing a titanium-aluminum-based alloy, in particular to a method for smelting a titanium-aluminum-based alloy, which is used for improving the fluidity of a titanium-aluminum-based alloy melt. Background technique [0002] With the continuous improvement of the performance of engines such as aviation, aerospace, automobiles, and ships, high-temperature materials are required to have higher strength, higher oxidation resistance and lighter density. In γ-TiAl-based alloy materials, metal bonds and covalent bonds coexist, and have good high-temperature strength, creep resistance and oxidation resistance. It is considered to be a new generation of new lightweight high-temperature structural materials with broad application prospects. , can be used to manufacture compressors, gas turbine blades, compressor stator windshields, stator frames and other complex-shaped large-scale casting and forging parts to partial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C14/00
Inventor 刘鑫旺张兆龙刘富初樊自田
Owner HUAZHONG UNIV OF SCI & TECH
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