Heat treatment method for obtaining near-lamellar texture of peritectic casting TiAl alloy

A heat treatment method and over-peritectic technology, applied in the field of metal heat treatment, can solve the problems of long production cycle and loss, and achieve the effect of eliminating casting segregation

Active Publication Date: 2019-04-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the existing anisotropy due to the dissolution and degradation of the lamellar structure in the prior art, avoid the adverse effects caused by the stress and cracks caused by quenching, and the shortcomings of long production cycle, the present invention proposes a method to obtain Heat Treatment Method for Near Lamellar Structure of Peritectic Cast TiAl Alloy

Method used

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  • Heat treatment method for obtaining near-lamellar texture of peritectic casting TiAl alloy
  • Heat treatment method for obtaining near-lamellar texture of peritectic casting TiAl alloy
  • Heat treatment method for obtaining near-lamellar texture of peritectic casting TiAl alloy

Examples

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Embodiment 1

[0049] This example is a heat treatment method for obtaining the nearly lamellar structure of cast TiAl alloy with the characteristics of peritectic solidification through hot isostatic pressing treatment and multi-step heat preservation and cooling treatment, and cast Ti-49.0Al-2Nb-2Cr-X Alloy as an example, to be described in detail.

[0050] The cast Ti-49.0Al-2Nb-2Cr-X alloy is obtained by vacuum electrode self-consumption + cold crucible induction melting anti-gravity casting method, and has the characteristics of peritectic solidification, such as image 3 As shown in a, the cast microstructure is composed of coarse irregular lamellar clusters with an average size of 500 μm and equiaxed coarse gamma grains with an average size of 100 μm between the lamellar clusters.

[0051] The concrete process of this embodiment is:

[0052] Step 1, hot isostatic pressing treatment. Place the cast TiAl alloy in a hot isostatic pressing furnace, raise the temperature to 1200° C., rai...

Embodiment 2

[0058] This example is a heat treatment method for obtaining the near-lamellar structure of cast TiAl alloy with the characteristics of peritectic solidification through hot isostatic pressing treatment and multi-step heat preservation and cooling treatment, and cast Ti-47.8Al-2Nb-2Cr-X Alloy as an example, to be described in detail.

[0059] The cast Ti-47.8Al-2Nb-2Cr-X alloy is obtained by vacuum electrode self-consumption + water-cooled copper crucible induction melting centrifugal casting method, and has the characteristics of peritectic solidification, such as Figure 4 As shown in a, the casting microstructure is completely composed of coarse irregular lamellar clusters with an average size of 500 μm.

[0060] The concrete process of this embodiment is:

[0061] Step 1, hot isostatic pressing treatment. Put the cast TiAl alloy in a hot isostatic pressing furnace, raise the temperature and increase the pressure in an atmosphere of argon protective gas, keep the pressure...

Embodiment 3

[0068] This example is a heat treatment method for obtaining the near-lamellar structure of cast TiAl alloy with peritectic solidification characteristics through hot isostatic pressing treatment and multi-step heat preservation and cooling treatment, and cast Ti-48.3Al-4Nb-2Cr-X Alloy as an example, to be described in detail.

[0069] The cast Ti-48.3Al-4Nb-2Cr-X alloy is obtained by vacuum electrode self-consumption + water-cooled copper crucible induction melting gravity casting method, and has the characteristics of peritectic solidification, such as Figure 5 As shown in a, its cast microstructure is completely composed of irregular lamellar clusters with an average size of 250 μm.

[0070] The concrete process of this embodiment is:

[0071] Step 1, hot isostatic pressing treatment. Put the cast TiAl alloy in a hot isostatic pressing furnace, raise the temperature and increase the pressure under the atmosphere of argon protective gas, keep the pressure at 150 MPa and 1...

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Abstract

The invention relates to a heat treatment method for obtaining a near-lamellar texture of a peritectic casting TiAl alloy. The near-lamellar texture of the peritectic casting TiAl alloy is obtained through hot isostatic pressure treatment, texture regulation and control heat treatment and stabilization heat treatment. According to the heat treatment method, the holding temperature, the holding time and the heating and cooling speed are controlled in the heat treatment process, control over the casting TiAl alloy texture having the peritectic solidification characteristic is achieved, the specific near-lamellar texture is obtained, and the shortcomings that in the prior art, a lamellar texture dissolves and degenerates so that original anisotropy can be lost, and poor influences and the long production period are caused by generation of stress and cracks due to quenching are overcome.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a heat treatment method for obtaining a cast TiAl alloy near-lamellar structure with the feature of peritectic solidification through hot isostatic pressing treatment and multi-step heat preservation and cooling treatment. Background technique [0002] TiAl alloy has attracted much attention due to its excellent properties such as high specific strength and high oxidation resistance, and has a good application prospect in the field of high-temperature structural materials. TiAl alloy is the only candidate structural material that can reduce weight between the upper limit of service temperature of high-temperature titanium alloy and the lower limit of service temperature of high-temperature alloy. [0003] The document "Microstructural Evolution and Mechanical Properties of A Forged Gamma Titanium l Auminide Alloy" published by Y-W.Kim in Volume 40 of the journal "Act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 杨劼人高子彤胡锐吴与伦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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