Preparation method of TiAl-based alloy with fine fully lamellar microstructure

A technology of base alloy and layer, which is applied in the field of preparation of TiAl base alloy, can solve the problems of unsuitability for industrial production, uneven thermal deformation structure, cracking of sample surface, etc., achieve low production cost, increase room temperature tensile strength, The effect of reducing heat treatment temperature and holding time

Active Publication Date: 2013-11-27
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

At present, there are relatively few studies on the transformation of the near-γ structure of TiAl-based alloys into uniform and fine full-layer lamellar structures.
The commonly used methods to obtain uniform and fine full-layer lamellar structure include thermomechanical treatment, mainly including isothermal forging, extrusion, hot die forging and rolling, etc., but these methods easily lead to cracking on the surface of the sample and uneven thermal deformation structure. , and the production cost is relatively high, so it is not suitable for large-scale industrial production

Method used

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  • Preparation method of TiAl-based alloy with fine fully lamellar microstructure
  • Preparation method of TiAl-based alloy with fine fully lamellar microstructure
  • Preparation method of TiAl-based alloy with fine fully lamellar microstructure

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Experimental program
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Effect test

Embodiment 1

[0055] The α and β phases of powder metallurgy TiAl-based alloys (the composition of which is Ti-47Al-2Cr-2Nb-0.2W in atomic mole percent) with near-γ structure or γ structure to be heat treated are measured by differential thermal analysis (DSC) transition temperature T α is 1330°C;

[0056] The powder metallurgy TiAl-based alloy (its composition is Ti-47Al-2Cr-2Nb-0.2W in atomic mole percentage) prepared by hot isostatic pressing of powder with near γ structure or γ structure is cut into a size of 10× 10×10mm heat treatment sample, after coating a layer of glass powder on the surface of the sample, heat it to 1335 ° C for 15 minutes (take the rapid heating method of setting out at temperature), and then air cool to room temperature. The sample after heat treatment was ground, polished, corroded, and the microstructure of the alloy was observed. image 3 Shown is a relatively uniform, fine full-thickness sheet tissue. The average size of lamellar clusters is about 180 μm, ...

Embodiment 2

[0058] The α and β phases of powder metallurgy TiAl-based alloys (the composition of which is Ti-47Al-2Cr-2Nb-0.2W in atomic mole percent) with near-γ structure or γ structure to be heat treated are measured by differential thermal analysis (DSC) transition temperature T α is 1330°C;

[0059] The powder metallurgy TiAl-based alloy (its composition is Ti-47Al-2Cr-2Nb-0.2W in atomic mole percentage) prepared by hot isostatic pressing of powder with near γ structure or γ structure is cut into a size of 10× 10×10mm heat treatment sample, after coating a layer of glass powder on the surface of the sample, heat it to 1340 ° C for 15 minutes (take the rapid heating method of setting out at temperature), and then air cool the sample to room temperature. The samples after heat treatment were ground, polished and corroded, and the microstructure of the alloy was observed to obtain the following: Figure 5 Shown is a relatively uniform, fine full-thickness sheet tissue. The average si...

Embodiment 3

[0061] The α and β phases of powder metallurgy TiAl-based alloys (the composition of which is Ti-47Al-2Cr-2Nb-0.2W in atomic mole percent) with near-γ structure or γ structure to be heat treated are measured by differential thermal analysis (DSC) transition temperature T α is 1330°C;

[0062] The powder metallurgy TiAl-based alloy (its composition is Ti-47Al-2Cr-2Nb-0.2W in atomic mole percentage) prepared by hot isostatic pressing of powder with near γ structure or γ structure is cut into a size of 10× 10×10mm heat treatment sample, after coating a layer of glass powder on the surface of the sample, heat it to 1340 ° C for 25 minutes (take the rapid heating method of setting out at high temperature), then take the alloy out of the furnace, and air cool it to room temperature. The sample after heat treatment was ground, polished, corroded, and the microstructure of the alloy was observed. Image 6 Full-thickness slice tissue shown. The average size of laminar clusters is ab...

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Abstract

The invention relates to a preparation method of a TiAl-based alloy with a fine fully lamellar microstructure, which belongs to the technical field of preparation of titanium alloys. The preparation method comprises the following steps: placing a powder metallurgic TiAl-based alloy at a temperature which is 5 DEG C-15 DEG C higher than the alpha-phase beta-phase transformation temperature Talpha; and preserving the heat for 15-25 minutes under a protective environment, and cooling to obtain the TiAl-based alloy with the fine fully lamellar microstructure, wherein the powder metallurgic TiAl-based alloy matrix structure is a nearly gamma structure or a gamma structure. According to the preparation method of the TiAl-based alloy with the fine fully lamellar microstructure disclosed by the invention, the fully lamellar microstructure with eutectic cell dimension of 150 microns-320 microns and lamellar spacing of 0.2 micron-0.4 micron can be obtained by a simple thermal treatment method. Moreover, the preparation method is free of hot mechanical treatment, simple in process and low in cost, so that not only can structure optimization be carried out before alloy forming, but also treatment can be directly carried out onto a formed piece. Besides, the preparation method has the advantages of being capable of controlling the microscopic structure of the alloy, simple in production process, regular in used equipment, low in production cost and the like, and is convenient for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a TiAl-based alloy with a fine full-layer lamellar structure, and belongs to the technical field of titanium alloy preparation. Background technique [0002] TiAl-based alloy has the advantages of low density, high melting point, strong oxidation resistance, high temperature strength, high modulus, and good creep resistance. It is a new type of lightweight high-temperature structural material with great application prospects. It can be used as the material of choice for automobiles and aerospace, aeroengines and other components that work at higher temperatures, and is considered to be a new generation of high-temperature structural materials with great competitive potential. [0003] It is well known that TiAl-based alloys have severe room temperature brittleness, low fracture toughness, and difficulty in processing, which limit the practical application of TiAl-based alloys. However, the key way to ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00
Inventor 李慧中张丹阳梁霄鹏宋阳魏忠伟蒋梦玲
Owner CENT SOUTH UNIV
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