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A kind of preparation method of large size tial base alloy seed crystal

A large-size, base alloy technology, which is applied in the field of preparation of TiAl-based alloy seed crystals, can solve the problems of small seed crystal size and unstable growth of columnar crystals, and achieve the effects of stable growth, improved melting effect, and easy operation

Active Publication Date: 2021-10-01
ANHUI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the directional solidification of the seed crystal method, the preparation of the seed crystal is a crucial step, but the size of the seed crystal prepared by the existing method is generally small, and the growth of the columnar crystal is unstable

Method used

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  • A kind of preparation method of large size tial base alloy seed crystal
  • A kind of preparation method of large size tial base alloy seed crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of a kind of large-sized TiAl-based alloy seed crystal that the present invention proposes comprises the following steps:

[0025] S1. Prepare seed crystal raw materials respectively, including 0-grade sponge titanium, high-purity aluminum, aluminum-tungsten master alloy, and high-purity silicon. Among them, Al is 46 at.%, W is 0.5 at.%, and Si is 0.5 at.%. The rest is Ti;

[0026] S2, adding the seed crystal raw material prepared in step S1 into a water-cooled copper crucible vacuum induction melting furnace;

[0027] S3. Vacuumize the melting chamber in the vacuum induction melting furnace to 3×10 -3 Below Pa, feed argon to 0.05Pa into the vacuum induction melting furnace;

[0028] S4. Under the protection of argon, add 0.07% of the modified product of the total mass of the seed crystal raw material into the melting furnace;

[0029] The modification is prepared by the following method: in the first step, Na is prepared in a mass ratio of 3:1...

Embodiment 2

[0034] The preparation method of a kind of large-sized TiAl-based alloy seed crystal that the present invention proposes comprises the following steps:

[0035] S1. Prepare seed crystal raw materials respectively, including 0-grade sponge titanium, high-purity aluminum, aluminum-tungsten master alloy, and high-purity silicon. Among them, Al is 47 at.%, W is 1 at.%, Si is 0.5 at.%, and the rest for Ti;

[0036] S2, adding the seed crystal raw material prepared in step S1 into a water-cooled copper crucible vacuum induction melting furnace;

[0037] S3. Vacuumize the melting chamber in the vacuum induction melting furnace to 1×10 -3 Pa below, into the vacuum induction melting furnace into argon to 0.03Pa;

[0038] S4. Under the protection of argon, add 0.09% of the modified product of the total mass of the seed crystal raw material into the melting furnace;

[0039] The modification is prepared by the following method: in the first step, Na is prepared in a mass ratio of 4:1 ...

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Abstract

The invention discloses a method for preparing a large-sized TiAl-based alloy seed crystal, which includes the following steps: S1, respectively preparing sponge titanium, high-purity aluminum, aluminum-tungsten intermediate alloy, and high-purity silicon, controlling the Al to be 46-47 at .%, W is 0.5-1at.%, Si is 0.5at.%, and the rest is Ti; S2, adding the seed crystal raw material into the melting furnace; S3, vacuuming the melting furnace with argon; S4, under the protection of argon , add the modified substance into the melting furnace; S5, turn on the power supply, increase the power supply to 55-60kW, and smelt; S6, reduce the power supply power to 50-55kW, keep warm, and obtain the seed crystal melt; S7, directly cut off the power supply, The seed crystal melt is chilled in the water-cooled copper crucible by using a water-cooled copper crucible, cooled to room temperature, and the seed crystal ingot is obtained. The preparation method proposed by the invention has the advantages of simple operation and practical production, and the obtained seed crystal has a large size, and the growth of the columnar crystal is stable.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a method for preparing a large-sized TiAl-based alloy seed crystal. Background technique [0002] TiAl-based alloys have been widely concerned by researchers because of their low density, good high-temperature strength, creep resistance, oxidation resistance, and large elastic modulus. The room temperature microstructure of TiAl-based alloys usually consists of γ phase (TiAl) and α 2 Phase (Ti 3 Al) composition, and according to the structure of γ phase and α 2 Depending on the phase morphology and content, TiAl-based alloys usually have various types of structures at room temperature, such as full lamellar structure, nearly full lamellar structure, dual state structure and γ lath structure. Among them, the comprehensive performance of the TiAl-based alloy with full lamellar structure is the best. The performance tests of TiAl-based alloys conducted by Japanese scholars usin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C14/00C22C1/06B22D27/04
CPCB22D27/045C22C1/03C22C1/06C22C14/00
Inventor 刘桐李建生鹿宪珂桂凯旋王刚
Owner ANHUI POLYTECHNIC UNIV