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 prac

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1

[0026] In the preparation process, sponge titanium, AlNb50 alloy, AlMo60 alloy, and pure Al are used as raw materials to prepare titanium aluminum alloy Ti-46at%Al-4at%Nb-1.0at%Mo. Pre-evacuate 3.5Pa in the vacuum induction furnace, then fill with argon to 60000Pa and then smelt. When the titanium aluminum alloy material is completely melted, continue to smelt and stir for 2 minutes, then stop melting, and cool the titanium aluminum alloy ingot to room temperature; press the above The process of titanium aluminum ingots is repeated three times in total (the direction of the ingots are reversed before each smelting), and then the titanium aluminum alloy thin-walled parts and mechanical test bars are cast.

[0027] The tested room temperature performance of titanium aluminum alloy is: tensile strength is 380Mpa, elongation is 0.70%; 900℃ high temperature performance: tensile strength is 350Mpa, elongation is 2.5%.

Example Embodiment

[0028] Example 2

[0029] In the preparation process, sponge titanium, 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 3.5Pa in the vacuum induction furnace, then fill with argon to 60000Pa and then smelt. When the titanium aluminum alloy material is completely melted, continue to smelt and stir for 2 minutes, then stop melting, and cool the titanium aluminum alloy ingot to room temperature; press the above The process of titanium aluminum ingots is repeated three times in total (the direction of the ingots are reversed before each smelting), and then the titanium aluminum alloy thin-walled parts and mechanical test bars are cast.

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

Example Embodiment

[0031] Example 3

[0032] In the preparation process, sponge titanium, 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 3.5Pa in the vacuum induction furnace, then fill with argon to 60000Pa and then smelt. When the titanium aluminum alloy material is completely melted, continue to smelt and stir for 2 minutes, then stop melting, and cool the titanium aluminum alloy ingot to room temperature; press the above The process of titanium aluminum ingots is repeated three times in total (the direction of the ingots are reversed before each smelting), and then the titanium aluminum alloy thin-walled parts and mechanical test bars are cast.

[0033] The tested room temperature performance of titanium aluminum alloy is: tensile strength is 400Mpa, elongation rate is 0.70%; 900℃ high temperature performance: tensile strength is 360Mpa, elongation rate is 2.5%.

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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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