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Preparation method of TiAl alloy quasi seed crystals

An alloy and seed crystal technology is applied in the field of preparation of TiAl alloy quasi-seed crystals, which can solve problems such as difficulty in obtaining TiAl alloy seed crystals.

Inactive Publication Date: 2015-11-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the shortage of difficulty in obtaining TiAl alloy seed crystals in the prior art, the present invention proposes a preparation method of TiAl alloy quasi-seed crystals

Method used

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  • Preparation method of TiAl alloy quasi seed crystals
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  • Preparation method of TiAl alloy quasi seed crystals

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[0031] The invention is a method for preparing a TiAl alloy quasi-seed crystal. The implementation process of the present invention will be specifically described through 28 examples. Wherein the preparation process of each embodiment is the same, the difference lies in the process parameters in each embodiment, and the composition of the TiAl alloy involved, specifically see Table 1:

[0032] Table 1: Alloy composition and preparation parameters of each embodiment

[0033]

Embodiment 1

[0036] This example is a method for preparing Ti-48Al-2Nb-2Cr alloy quasi-seed crystal. Specific steps are as follows:

[0037]The first step, ingredients: according to the relationship between the mass fraction and the atomic fraction, prepare 1 kg of TiAl alloys with different atomic fractions shown in Table 1, and use a vacuum water-cooled copper crucible induction melting furnace to melt the Ti-48Al-2Nb-2Cr alloy The material is smelted.

[0038] The second step, smelting and pouring: put the prepared raw materials in a vacuum water-cooled copper crucible induction melting furnace, and use a conventional melting method for the first smelting. The melting temperature is 1650°C to 1750°C, and the temperature is kept for 5 minutes to obtain an alloy melt. After the heat preservation is completed, the power is turned off to cool the alloy melt to room temperature in a cold crucible to obtain an alloy ingot. Turn the cooled ingot over, put it back into the cold crucible, and ...

Embodiment 2

[0043] This example is a method for preparing Ti-48Al-2Nb-2Cr alloy quasi-seed crystal. Specific steps are as follows:

[0044] The first step, ingredients: according to the relationship between the mass fraction and the atomic fraction, prepare 1 kg of TiAl alloys with different atomic fractions shown in Table 1, and use a vacuum water-cooled copper crucible induction melting furnace to melt the Ti-48Al-2Nb-2Cr alloy The material is smelted.

[0045] The second step, smelting and pouring: put the prepared raw materials in a vacuum water-cooled copper crucible induction melting furnace, and use a conventional melting method for the first smelting. The melting temperature is 1650°C to 1750°C, and the temperature is kept for 5 minutes to obtain an alloy melt. After the heat preservation is completed, the power is turned off to cool the alloy melt to room temperature in a cold crucible to obtain an alloy ingot. Turn the cooled ingot over, put it back into the cold crucible, and...

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Abstract

A preparation method of TiAl alloy quasi seed crystals comprises steps as follows: TiAl alloy ingots which are consistent in lamellar orientation and parallel with the axial direction are obtained through smelting and casting by a vacuum water-cooled copper crucible induction melting furnace; heat treatment is performed, and lamellar structure orientations of the TiAl alloy ingots are kept stable with a quick heating method during heat treatment, so that the quasi seed crystals capable of controlling lamellar orientations during directional solidification are obtained. With the adoption of the method, alloys with primary phases being beta phases can have lamellar structures consistent in orientation and parallel with axial directions of the ingots, and orientations of the lamellar structures of the seed crystals can be controlled under the condition of quick heating.

Description

technical field [0001] The invention relates to solidification and heat treatment technology, in particular to a method for preparing a TiAl alloy quasi-seed crystal. Background technique [0002] TiAl alloy has good high temperature resistance, low density, high specific strength, high specific stiffness and good oxidation resistance. It has important application value in the fields of aviation industry and automobile industry. It is a very Lightweight high-temperature structural materials with application prospects. In addition, the oriented full lamellar structure of TiAl alloy has better high temperature strength and room temperature toughness than γ single phase structure and double state structure. Yamaguchi et al. systematically studied the properties of the full-lamellar structure of TiAl alloy with a single orientation, and found that the mechanical properties of the full-lamellar structure of TiAl alloy have strong directionality, and its strength and plasticity v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/04C30B29/52
Inventor 杜玉俊沈军张桓熊义龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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