Orientation-enhanced tungsten-containing high-niobium-titanium-aluminium alloy and preparation method thereof

A titanium-aluminum alloy, oriented technology, applied in the field of superalloys, can solve the problem that the lamellar structure cannot be guaranteed to be parallel to the preferential growth direction of directional solidification, and achieve the effects of improving comprehensive mechanical properties, broad application prospects and high melting temperature

Inactive Publication Date: 2017-06-20
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the directional solidification technology is mainly used to improve the microstructure of titanium-aluminum alloy and obtain the lamellar structure. However, if the TiAl alloy is controlled by the ordinary directional solidification method, no matter whether the α phase or the β phase is precipitated first, the final lamellar structure cannot be guaranteed. Tissue all parallel to the preferential growth direction of directional solidification

Method used

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  • Orientation-enhanced tungsten-containing high-niobium-titanium-aluminium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Using titanium, aluminum, niobium, and tungsten (all with a purity of 99.99%) as raw materials, according to Ti 48.8 Al 45 Nb 6 W 0.2 The composition ratio of the material is weighed.

[0029] (2) Put the above-mentioned prepared raw materials into an electric arc melting furnace, evacuate to 0.01Pa, fill with high-purity argon to 600Pa, and then melt under the conditions of an electric arc melting furnace current of 200A and a voltage of 2V to prepare The composition is Ti 48.8 Al 45 Nb 6 W 0.2 button ingots, weighing 20g.

[0030] (3) Put the button ingot prepared above into the suspension melting furnace, evacuate to 5Pa, fill with high-purity argon to 0.03MPa, and then use a quartz tube with a diameter of Ф6mm under the condition of the suspension melting furnace power of 20KW Suction casting, the prepared composition is Ti 48.8 Al 45 Nb 6 W 0.2 The cylindrical test rod, the size of the test rod is Ф4×70mm.

[0031](4) Put the cylindrical test rod p...

Embodiment 2

[0034] (1) Using titanium, aluminum, niobium, and tungsten (all with a purity of 99.99%) as raw materials, according to Ti 48.5 al 45 Nb 6 W 0.5 The composition ratio of the material is weighed.

[0035] (2) Put the above-mentioned prepared raw materials into an electric arc melting furnace, evacuate to 0.02Pa, fill with high-purity argon to 630Pa, and then smelt under the conditions of an electric arc melting furnace current of 200A and a voltage of 2V to prepare The composition is Ti 48.5 al 45 Nb 6 W 0.5 button ingots, weighing 25g.

[0036] (3) Put the button ingot prepared above into the suspension smelting furnace, evacuate to 7Pa, fill with high-purity argon to 0.04MPa, and then use a quartz tube with a diameter of Ф6mm under the condition that the power of the suspension smelting furnace is 20KW Suction casting, the prepared composition is Ti 48.5 al 45 Nb 6 W 0.5 The cylindrical test rod, the size of the test rod is Ф4×80mm.

[0037] (4) Put the cylindric...

Embodiment 3

[0040] (1) Using titanium, aluminum, niobium, and tungsten (all with a purity of 99.99%) as raw materials, according to Ti 48.2 al 45 Nb 6 W 0.8 The composition ratio of the material is weighed.

[0041] (2) Put the above-mentioned prepared raw materials into an electric arc melting furnace, evacuate to 0.03Pa, fill with high-purity argon to 650Pa, and then smelt under the conditions of an electric arc melting furnace current of 200A and a voltage of 2V to prepare The composition is Ti 48.2 al 45 Nb 6 W 0.8 button ingots, weighing 30g.

[0042] (3) Put the button ingot prepared above into the suspension smelting furnace, evacuate to 10Pa, fill it with high-purity argon to 0.05MPa, and then use a quartz tube with a diameter of Ф6mm under the condition of the power of the suspension smelting furnace at 20KW Suction casting, the prepared composition is Ti 48.2 al 45 Nb 6 W 0.8 The cylindrical test rod, the size of the test rod is Ф6×90mm.

[0043] (4) Put the cylindr...

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Abstract

The invention discloses an orientation-enhanced tungsten-containing high-niobium-titanium-aluminium alloy and a preparation method thereof. The alloy comprises the following components: 45.0-48.0% of Al, 5.0-8.0% of Nb, 0.2-0.8% of W, and the balance of Ti. The preparation method disclosed by the invention comprises the following steps of preparing a button ingot by utilizing electric arc melting; performing suspension smelting and suction casting to obtain a cylindrical test bar; and performing orientated solidification on the test bar by a Bridgeman method to obtain the orientation-enhanced tungsten-containing high-niobium-titanium-aluminium alloy. The alloy has the advantages that the alloy has a fine and uniform fully lamellar structure, and the included angle of the final lamellar structure direction and the preferentially growing direction of orientated solidification is 0 degree or close to 0 degree.

Description

technical field [0001] The invention belongs to the field of high-temperature alloys, in particular to a tungsten-containing high-niobium titanium-aluminum alloy with enhanced orientation and a preparation method thereof. Background technique [0002] With the development of aerospace, automotive and other industrial fields, people are usually constrained by the performance limit of materials when pursuing higher efficiency and higher performance, and cannot further meet the requirements for material performance. Therefore, the development and utilization of new materials is imminent. In the field of high-temperature alloys, high-temperature intermetallic compounds have the advantages of low density, high melting point, specific strength and high-temperature strength, and good oxidation resistance and creep resistance. Therefore, the emergence of high-temperature intermetallic compounds has made people see new hope. It is hoped that the study of high-temperature intermetal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/02
CPCC22C14/00C22C1/02
Inventor 吴兴超李永胜侯志远
Owner NANJING UNIV OF SCI & TECH
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