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Thermo-mechanical treatment method for controlling TiAl alloy fine grain structure

A technology of deformation heat treatment and heat treatment furnace, which is applied in the field of thermal processing and preparation of high-temperature structural materials, can solve the problems of room temperature plasticity but poor high-temperature performance, poor mechanical properties of near-γ structures, and no patent publication, etc., to promote phase transformation and microstructure evolution , reduce the production cycle, eliminate the effect of defective structure

Active Publication Date: 2020-12-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2013, H. Clemens et al. conducted a comprehensive evaluation of the mechanical properties of four typical microstructures of TiAl alloys in the document "Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys" published in Volume 15 of the "Advanced Engineering Materials" journal, pointing out that The advantages of lamellar structure are good strength, toughness and creep resistance, excellent high temperature performance, bimodal structure has high room temperature plasticity but poor high temperature performance, and near lamellar structure combines full lamellar structure and bimodal structure. Performance characteristics, with relatively balanced room temperature and high temperature performance, and poor mechanical properties of near-γ tissue, which does not have engineering application value
At present, for TiAl alloys, there is no public report on obtaining fine-grained full-lamellar and fine-grained near-lamellar microstructures by combining pre-deformation treatment in the α single-phase region and isothermal heat treatment in the α+γ two-phase region. Corresponding patent publication

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  • Thermo-mechanical treatment method for controlling TiAl alloy fine grain structure
  • Thermo-mechanical treatment method for controlling TiAl alloy fine grain structure
  • Thermo-mechanical treatment method for controlling TiAl alloy fine grain structure

Examples

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Embodiment 1

[0053] This example is a deformation heat treatment method for obtaining a fine-grained full-lamellar structure of TiAl alloy by using pre-deformation treatment and isothermal heat treatment in combination, and Ti-48.5Al-4Nb-2Cr-0.3(Fe, C, N) Alloy as an example, to be described in detail.

[0054] The Ti-48.5Al-4Nb-2Cr-0.3 (Fe, C, N) alloy is obtained by vacuum electrode self-consumption + water-cooled copper crucible induction melting centrifugal casting method, and the α of the composition alloy is obtained by metallography and differential thermal analysis. The temperature range of the single-phase region is 80°C, the temperature at the junction of the α single-phase region and the α+γ two-phase region, that is, the Tα temperature is 1390°C, the temperature range of the α+γ two-phase region is 130°C, and the Tγ temperature is 1260°C. Such as image 3 As shown, its microstructure is composed of coarse lamellar clusters with an average size greater than 300 μm and γ grains,...

Embodiment 2

[0060] This embodiment is a deformation heat treatment method for obtaining TiAl alloy fine-grained near-lamellar layers by combining pre-deformation treatment and isothermal heat treatment, and taking Ti-47Al-2Nb-2Cr-0.2(C, N) alloy as an example, be described in detail.

[0061]The Ti-47Al-2Nb-2Cr-0.2(C, N) alloy is obtained by vacuum electrode self-consumption + water-cooled copper crucible induction melting gravity casting method, and the α single phase of the composition alloy is obtained by metallographic method and differential thermal analysis method The temperature range of the zone is 130°C, the temperature at the junction of the α single-phase zone and the α+γ two-phase zone, that is, the Tα temperature is 1340°C, the temperature range of the α+γ two-phase zone is 200°C, and the Tγ temperature is 1140°C. Such as Figure 5 As shown, its microstructure is completely composed of coarse lamellar clusters with an average size of more than 500 μm, which belongs to the fu...

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Abstract

The invention discloses a thermo-mechanical treatment method for controlling a TiAl alloy fine grain structure, and relates to the technical field of hot working preparation of high-temperature structural materials. The thermo-mechanical treatment method is used for obtaining TiAl alloy fine grain near-lamellar structure and a fine grain full-lamella structure through combined use of pre-deformation treatment and isothermal thermal treatment means, a TiAl alloy blank is placed into a box-type heat treatment furnace, pre-heat-preservation is conducted, pre-deformation treatment is completed, then isothermal heat treatment is conducted, and the TiAl alloy fine grain structure is obtained. According to the thermo-mechanical treatment method, the thermo-mechanical treatment process with accurate temperature control is adopted, according to accurate analysis of the two-phase temperature interval range and accurate design and control of the deformation amount, the deformation rate and the heat preservation temperature in the deformation heat treatment process, accurate adjustment and control over the TiAl alloy structure can be achieved, and the fine grain near-lamellar structure and thefine grain full-lamellar structure are obtained.

Description

technical field [0001] The invention relates to the technical field of thermal processing and preparation of high-temperature structural materials, in particular to a deformation heat treatment method for obtaining TiAl alloy fine-grain near-lamellar and fine-grain full-lamellar structures by combining pre-deformation treatment and isothermal heat treatment. Background technique [0002] TiAl alloy has the advantages of high melting point, high specific strength, high creep strength, and good oxidation resistance. It is a hot light-weight structural heat-resistant material for the development of aerospace active equipment. It can replace traditional high-temperature materials in the temperature range of 650-1000 °C. Alloy with great application potential. [0003] Microstructure is an important characteristic of alloys. In 1992, Y.W.Kim published the document "Microstructural Evolution and Mechanical Properties of A Forged Gamma Titanium l Auminide Alloy" in the journal "Ac...

Claims

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Application Information

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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 杨劼人高子彤胡锐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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