High temperature resistant titanium and aluminum based alloy and manufacturing method thereof

A titanium-aluminum alloy, high-temperature-resistant 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

Active Publication Date: 2009-07-08
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

[0022] Example 1

[0023] In the preparation process, sponge titanium, AlNb50 alloy, AlCr50 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%Cr-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 smelting and stirring for 2 minutes, then stop smelting, and cool the titanium-aluminum alloy ingot to room temperature; press the above The process titanium aluminum ingot is repeatedly smelted three times (the direction of the ingot is reversed before each smelting), and then the titanium aluminum alloy thin-walled parts and the mechanical test test bar are cast.

[0024] The room temperature performance of the titanium aluminum alloy tested is: the tensile strength is 360Mpa, and the elongation is 0.80%; the high temperature performance at 900°C: the tensile strength is 340Mpa an...

Example Embodiment

[0025] Example 2

[0026] In the preparation process, sponge titanium, AlNb50 alloy, AlCr50 alloy, pure Ni, and pure Al are used as raw materials to prepare titanium aluminum alloy Ti-44at%Al-5at%Nb-0.2at%Cr-0.8at%Ni. Pre-evacuate 3.5Pa in the vacuum induction furnace, and then fill with argon to 60000Pa before smelting. When the titanium-aluminum alloy material is completely melted, continue smelting and stirring for 2 minutes, then stop smelting, and cool the titanium-aluminum alloy ingot to room temperature; press the above A total of the titanium ingots are smelted three times repeatedly (the direction of the ingot is reversed before each smelting), the thin-walled titanium-aluminum alloy parts and the mechanical test test bars are cast.

[0027] The room temperature performance of the titanium aluminum alloy tested is: the tensile strength is 400Mpa, and the elongation is 0.50%; the high temperature performance at 900°C: the tensile strength is 360Mpa, and the elongation is 3...

Example Embodiment

[0028] Example 3:

[0029] In the preparation process, sponge titanium, AlNb50 alloy, AlCr50 alloy, pure Ni, pure Al and pure Si are used as raw materials to prepare titanium aluminum alloy Ti-48at%Al-3at%Nb-2at%Cr-0.1at%Ni-0.8Si. 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 smelting and stirring for 2 minutes, then stop smelting, and cool the titanium-aluminum alloy ingot to room temperature; press the above A total of the titanium ingots are smelted three times repeatedly (the direction of the ingot is reversed before each smelting), the thin-walled titanium-aluminum alloy parts and the mechanical test test bars are cast.

[0030] The room temperature performance of titanium aluminum alloy tested is: tensile strength is 340Mpa, elongation rate is 0.60%; 900℃ high temperature performance: tensile strength is 300Mpa, elongation rate is 2.0%.

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Abstract

The invention provides a high temperature resistant titanium-aluminium base alloy and a method for preparing the same, wherein, the alloy which belongs to gamma-TiAl alloy has components of Al of 44.0-48.0at%, Nb of 3.0-5.0at%, Cr of 0.2-2.0at%, Ni of 0.1-0.8at%, Si of 0-0.8at% and the rest are Ti and ineluctable impurity elements; the method comprises steps of using titanium sponge, AlNb alloy, AlCr alloy, Ni, Al and Si as the raw material, smelting, casting and shaping the raw material in a vacuum consumable electrode electrical arc skull crucible or a vacuum induction furnace, and when the casting process is performed, Ti-Al alloy casting ingot can be casted after vacuum melting or be casted after argon-filling smelting.The alloy of the invention has characteristics of favorable room-temperature plasticity, creep-resistance capability and anti-oxygenic property, can be used under a temperature of 800-900 DEG C, is suitable for the casting of parts with thin walls, can improve the use characteristics of aircraft engines and car engines, and has a wide market outlook.

Description

technical field [0001] The invention relates to a technology in the field of high-temperature alloys, in particular to a high-temperature-resistant titanium-aluminum-based alloy 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 be partially replaced by bulky nickel-based superalloys, which can reduce weight by ...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C30/00C22C1/02
Inventor 陈志强周洪强
Owner LUOYANG SUNRUI TI PRECISION CASTING
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