A kind of preparation method of vacuum centrifugal tial intermetallic compound plate

An intermetallic compound and vacuum centrifugation technology, applied in the field of metal material processing and sheet manufacturing, can solve the problems of poor high temperature deformation ability, difficult processing technology, low room temperature plasticity of TiAl alloy, etc. The effect of less equal defects and fewer shrinkage porosity defects

Active Publication Date: 2022-01-18
NORTHEASTERN UNIV
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Problems solved by technology

[0007] In order to overcome the deficiencies of the prior art and solve the problems of low room temperature plasticity, poor high temperature deformation ability and difficult traditional processing technology of the TiAl alloy in the prior art, the present invention provides a vacuum centrifugal TiAl intermetallic compound pipe / plate preparation method

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  • A kind of preparation method of vacuum centrifugal tial intermetallic compound plate
  • A kind of preparation method of vacuum centrifugal tial intermetallic compound plate
  • A kind of preparation method of vacuum centrifugal tial intermetallic compound plate

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preparation example Construction

[0039] Such as figure 1 As shown, the present embodiment provides a method for preparing a vacuum centrifuged TiAl intermetallic compound plate, comprising the following steps:

[0040] S1. Melting: Melting pure Ti, pure Al and other alloys in a vacuum environment or under the protection of argon to prepare a TiAl alloy melt. Alloy smelting under vacuum or argon protection can effectively reduce the oxidation and loss of alloy elements and avoid waste.

[0041] S2. Vacuum centrifugal casting: the TiAl alloy melt obtained in step S1 is poured into the casting mold of the centrifugal casting equipment under the condition of vacuum environment and argon protection, and the TiAl alloy melt is constrained to form under the action of centrifugal force, after After rapid cooling, solidification and demoulding, a hollow TiAl alloy cast tube billet is obtained. Using the vacuum centrifugal casting process, under the action of centrifugal force, the alloy melt can be fed during the fi...

Embodiment 1

[0059] This embodiment provides a method for preparing the aforementioned vacuum centrifuged TiAl intermetallic compound plate, comprising the following steps:

[0060] S1. Smelting: Sponge titanium with a purity of ≥99.95%, Al with a purity of ≥99.99%, Al-50Nb (mass fraction, wt.%) alloy and Al-56Mo (mass fraction, wt.%) alloy, according to the composition ratio , smelted into a TiAl alloy melt of Ti-43Al-4Nb-1.5Mo (atomic fraction, at.%) in a vacuum environment. Among them, the vacuum pressure is 10 -3 Pa, to ensure the purity of the alloy melt.

[0061] In this embodiment, a graphite crucible is selected for alloy smelting to prevent Ti and Al elements from chemically reacting with the crucible to introduce impurities. The pouring temperature of the alloy melt is 1580°C, which ensures the fluidity of the alloy melt and at the same time ensures the forming of the tube blank during the mold pouring process.

[0062] S2. Vacuum centrifugal casting: pour the TiAl alloy melt ...

Embodiment 2

[0072] This embodiment provides another method for preparing the aforementioned vacuum centrifuged TiAl intermetallic compound plate, which includes the following steps:

[0073] S1. Smelting: Sponge titanium with a purity of 99.95%, Al ingot with a purity of 99.99%, Al-50Nb (mass fraction, wt.%) alloy, Al-56Mo (mass fraction, wt.%) alloy, high-purity V The ingot and high-purity B powder are smelted into a TiAl alloy of Ti-44Al-5Nb-1Mo-2V-0.2B (atomic fraction, at.%) in an argon-protected environment according to the composition ratio.

[0074] In this embodiment, a graphite crucible is selected for alloy smelting to prevent Ti and Al elements from chemically reacting with the crucible to introduce impurities. The pouring temperature of the alloy melt is 1600°C, which ensures the fluidity of the alloy melt and at the same time ensures the forming of the tube blank during the mold pouring process.

[0075] S2. Vacuum centrifugal casting: the TiAl alloy melt obtained in step S1...

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Abstract

The invention relates to a preparation method of a vacuum centrifugal TiAl intermetallic compound plate, comprising the following steps: S1, smelting: smelting pure Ti and pure Al into a TiAl alloy melt; S2, centrifugal casting: pouring the TiAl alloy melt into a centrifugal In the casting mold of the casting equipment, the alloy melt is constrained to form under the action of centrifugal force to obtain a TiAl alloy cast tube billet; S3, cutting: cutting the TiAl alloy cast tube billet to obtain a TiAl alloy billet; S4, pressing and forming: The TiAl alloy billet is pressed and surface treated to obtain a TiAl alloy slab. The invention adopts the method of vacuum centrifugal casting, so that the liquid TiAl alloy melt can be directly and rapidly condensed to form a tube blank, and then the structure and size are effectively controlled by pressing forming, and a TiAl alloy slab that can be directly used or suitable for thermal deformation processing is prepared. The realization of low-cost, short-process and large-scale manufacturing broadens the industrial application of TiAl alloy plates.

Description

technical field [0001] The invention belongs to the technical field of metal material processing and plate manufacturing, and in particular relates to a preparation method of a vacuum centrifuged TiAl intermetallic compound plate. Background technique [0002] TiAl alloy is a new lightweight high-temperature structural material that is expected to replace some Ni-based superalloys, because of its excellent properties, including low density, high specific strength and high specific modulus, good high temperature oxidation resistance and creep resistance performance, and has attracted the attention of the industry. TiAl alloys can be used for high-pressure turbine blades, compressor blades, thermal protection plates, exhaust valves and nozzles for engines, and have broad application prospects in aviation, aerospace, and automotive engines. Among them, TiAl alloy plate / strip has become the most urgently needed material in the process of industrialization and practical applicat...

Claims

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Application Information

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IPC IPC(8): B23P15/00B22D13/02
CPCB23P15/00B22D13/02
Inventor 刘国怀王秀琦郭瑞琪徐莽王丙兴田勇王昭东
Owner NORTHEASTERN UNIV
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