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TiAl-based alloy material with excellent high-temperature property and preparation method thereof

A high-temperature performance, titanium-aluminum alloy technology, applied in the field of high-temperature alloys, can solve problems such as poor compositional uniformity of castings, achieve good creep resistance and oxidation resistance, increase service temperature, and good room temperature plasticity

Inactive Publication Date: 2011-01-19
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After many years of research and testing at home and abroad, the γ-TiAl alloy that has undergone peritectic reaction can be used in practice, but the uniformity of the casting composition after solidification is worse than that of the γ-TiAl alloy solidified by the β phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the preparation process, titanium sponge, AlNb50 alloy, AlMo60 alloy and pure Al are used as raw materials to prepare titanium alloy Ti-46at%Al-4at%Nb-1.0at%Mo. 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 were smelted three times in total (reverse the direction of the ingot before each smelting), and then cast titanium-aluminum alloy thin-walled parts and mechanical test bars.

[0027] The room-temperature performance of the titanium-aluminum alloy was tested: the tensile strength is 380Mpa, and the elongation is 0.70%; the high-temperature performance at 900°C: the tensile strength is 350Mpa, and the elongation is 2.5%.

Embodiment 2

[0029] In the preparation process, titanium sponge, AlNb50 alloy, AlMo60 alloy, pure Ni, pure Al and pure Si are used as raw materials to prepare titanium aluminum alloy Ti-46at%Al-4at%Nb-0.6at%Mo-0.2at%Ni-0.1Si . 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 were smelted three times in total (reverse the direction of the ingot before each smelting), and then cast titanium-aluminum alloy thin-walled parts and mechanical test bars.

[0030] After testing, the room temperature performance of the titanium-aluminum alloy is: the tensile strength is 365Mpa, and the elongation is 0.80%; the high temperature performance at 900°C is: the tensile strength is 345Mpa, and the ...

Embodiment 3

[0032] In the preparation process, titanium sponge, AlNb50 alloy, AlMo60 alloy, pure Ni, pure Al and pure Si are used as raw materials to prepare titanium aluminum alloy Ti-44at%Al-5at%Nb-0.1at%Mo-0.8at%Ni-0.3Si . 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 were smelted three times in total (reverse the direction of the ingot before each smelting), and then cast titanium-aluminum alloy thin-walled parts and mechanical test bars.

[0033] After testing, the room temperature performance of the titanium-aluminum alloy is: the tensile strength is 400Mpa, and the elongation is 0.70%; the high temperature performance at 900°C is: the tensile strength is 360Mpa, and the ...

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Abstract

The invention introduces a TiAl-based alloy material with excellent high-temperature property. The TiAl-based alloy belongs to gamma-TiAl alloy and comprises the following chemical compositions in percentage by weight: 44.0 to 48.0 percent of Al, 3.0 to 5.0 percent of Nb, 0.1 to 3.0 percent of Mo, 0 to 0.8 percent of Ni, 0 to 0.8 percent of Si and the balance of Ti and inevitable impurities. A preparation method comprises a step of smelting and casting the materials in a vacuum consumable-electrode arc kish furnace or vacuum induction furnace, wherein a TiAl alloy ingot is subjected to vacuum melting or argon-filling melting first and then is cast in the casting process. Compared with the common TiAl alloy, the TiAl-based alloy material with excellent high-temperature property has higher usage temperature of up to 900 DEG C and has the advantages of good plasticity at room temperature, good creep-deformation resistance and oxidation resistance, good casting property, suitability for casting thin-wall components and great market prospect.

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 material with excellent high-temperature performance 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 superalloys, which ca...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02
Inventor 周洪强姜建伟
Owner LUOYANG SUNRUI TI PRECISION CASTING
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