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Titanium-aluminum base alloy with excellent room temperature ductility and casting fluidity and preparation method of titanium-aluminum base alloy

A fluidity, base alloy technology, applied in the field of superalloys, can solve the problems of poor room temperature plasticity and casting fluidity, inconvenience in the industrial casting of titanium-aluminum parts, etc., and achieve good room temperature plasticity, good casting fluidity, and huge market prospects Effect

Inactive Publication Date: 2013-01-02
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a high-temperature-resistant titanium-aluminum-based alloy material, which belongs to the γ-TiAl alloy, which has good room temperature plasticity and good casting fluidity, and is suitable for casting thin-walled parts, such as The turbine rotor of the turbocharger of the automobile engine; thereby overcoming the technical problems that the room temperature plasticity and casting flow properties of the existing titanium-aluminum alloy materials are very poor, and it is not convenient for the industrialized casting of titanium-aluminum parts

Method used

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  • Titanium-aluminum base alloy with excellent room temperature ductility and casting fluidity and preparation method of titanium-aluminum base alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the preparation process, titanium sponge, AlCr50 alloy, pure Ni, and pure Al are used as raw materials to prepare titanium-aluminum alloy Ti-48Al-3.0Cr-0.2Ni (at%). Pre-evacuate the vacuum to 3.5Pa in the vacuum induction furnace, then fill it with argon to 60000Pa and then smelt it. When the titanium-aluminum alloy material is completely melted, continue to smelt and stir for 2 minutes, then stop the smelting, and cool the titanium-aluminum alloy ingot to room temperature; press the above Process Titanium-aluminum ingots are repeatedly smelted three times in total, and the direction of the ingot is reversed before each smelting, and then cast titanium-aluminum alloy thin-walled parts and mechanical test bars.

[0027] The room temperature performance and casting filling rate of titanium-aluminum alloy after testing are shown in Table 1.

Embodiment 2

[0029] In the preparation process, titanium sponge, AlCr50 alloy, pure Ni, and pure Al are used as raw materials to prepare titanium-aluminum alloy Ti-44Al-0.5Cr-3.0Ni (at%). Pre-evacuate the vacuum to 3.5Pa in the vacuum induction furnace, then fill it with argon to 60000Pa and then smelt it. When the titanium-aluminum alloy material is completely melted, continue to smelt and stir for 2 minutes, then stop the smelting, and cool the titanium-aluminum alloy ingot to room temperature; press the above Process Titanium-aluminum ingots are repeatedly smelted three times in total, and the direction of the ingot is reversed before each smelting, and then cast titanium-aluminum alloy thin-walled parts and mechanical test bars.

[0030] The room temperature performance and casting filling rate of titanium-aluminum alloy after testing are shown in Table 1.

Embodiment 3

[0032] In the preparation process, titanium sponge, AlCr50 alloy, pure Ni, and pure Al are used as raw materials to prepare titanium-aluminum alloy Ti-47Al-2.0Cr-2.0Ni (at%). Pre-evacuate the vacuum to 3.5Pa in the vacuum induction furnace, then fill it with argon to 60000Pa and then smelt it. When the titanium-aluminum alloy material is completely melted, continue to smelt and stir for 2 minutes, then stop the smelting, and cool the titanium-aluminum alloy ingot to room temperature; press the above Process Titanium-aluminum ingots are repeatedly smelted three times in total, and the direction of the ingot is reversed before each smelting, and then cast titanium-aluminum alloy thin-walled parts and mechanical test bars.

[0033] The room temperature performance and casting filling rate of titanium-aluminum alloy after testing are shown in Table 1.

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Abstract

The invention discloses a titanium-aluminum base alloy with excellent room temperature ductility and casting fluidity and a preparation method of the titanium-aluminum base alloy. The alloy belongs to gamma-TiAL alloys, and comprises the following components: 44.0 to 48.0 atom percent of Al, 0.5 to 3.0 atom percent of Cr, 0.2 to 3.0 atom percent of Ni, 0 to 0.8 atom percent of Si, and the balanceof Ti and inevitable impurity elements. The preparation method comprises the following steps of: smelting qualified raw materials in a vacuum consumable electrode arc skull furnace or vacuum induction furnace, and performing casting forming; and during the casting forming, performing vacuum melting on a titanium-aluminum alloy cast ingot, and then performing casting or performing the casting after argon filling melting. The titanium-aluminum base alloy has high room temperature ductility and casting fluidity and is suitable for casting thin-wall parts, and when the titanium-aluminum base alloy is in use at 800 to 850 DEG C for a long time, the surface needs no antioxidation treatment.

Description

technical field [0001] The invention relates to a technology in the field of high-temperature alloys, in particular to a titanium-aluminum-based alloy with excellent room-temperature plasticity and casting fluidity and a preparation method thereof. Background technique [0002] With the continuous improvement of the performance of engines such as aviation, aerospace, automobiles, and ships, higher requirements are put forward for the performance of high-temperature materials, that is, higher strength, oxidation resistance, and lighter density. γ-TiAl-based alloy materials have the advantages of good high temperature strength, creep resistance and oxidation resistance, etc., and are developing into a new generation of aero-engine materials, which can be used to manufacture compressors, gas turbine blades, compressor stator windshields, stator machines Blocks and other large-scale casting and forging parts with complex shapes can partially replace bulky nickel-based supera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C30/00C22C1/03
Inventor 周洪强包淑娟陈志强王孟光吴胜男
Owner LUOYANG SUNRUI TI PRECISION CASTING
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