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Preparation method for gamma-TiAl alloy small fully-lamellar tissue

A full-lamellar and microstructure technology, which is applied in the field of fine full-lamellar microstructure preparation of γ-TiAl alloys, can solve the problems of low plasticity of γ-TiAl alloy parts at room temperature, and achieve the effects of avoiding adverse effects, reducing requirements, and reducing production costs

Inactive Publication Date: 2014-04-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing fine full-lamellar structures of γ-TiAl alloys, which can effectively solve the problem of low plasticity of γ-TiAl alloy parts at room temperature, reduce the difficulty of manufacturing process and production cost of deformed parts, reduce or even avoid Adverse Effects of Existing γ-TiAl Alloy Fine Full Lamellar Fabrication Process on Mechanical Properties

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  • Preparation method for gamma-TiAl alloy small fully-lamellar tissue
  • Preparation method for gamma-TiAl alloy small fully-lamellar tissue
  • Preparation method for gamma-TiAl alloy small fully-lamellar tissue

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[0032] Such as figure 1 As shown, the process of preparing the fine full-lamellar structure of γ-TiAl alloy is as follows: ① Preparation of γ-TiAl alloy; ② γ-TiAl alloy in the α+γ two-phase region, T α -100~T α Deformation in the -40°C temperature range to obtain α 2 The phase has a strong single deformation texture, and α 2 The phase grains are fine and uniform; ③The deformed structure is solid solution treated in the α single-phase region, and the solid solution time does not exceed the critical time for the texture to effectively inhibit the growth of α grains. α Incubate at +5°C for 5-40 minutes to obtain a fine and uniform full-lamellar tissue.

[0033] In the present invention, T α Represents the α phase transition temperature, which varies with the Al content. When the Al content is 47%, T α It is 1340°C. In terms of atomic percentage, the composition of γ-TiAl alloy is: Al43~48%; B0~0.15%; Nb2~8%; Cr1.5~3%; Ti balance. α in deformed tissue 2 The phase grain siz...

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Abstract

The invention belongs to the field of gamma-TiAl alloy intermetallic compounds, in particular to a preparation method for a gamma-TiAl alloy small fully-lamellar tissue. The method has the technical characteristics that (a), gamma-TiAl alloy is subjected to thermal deformation in an alpha+gamma three-phase area to obtain a deformation tissue of which the alpha2-phase has a strong single deformation texture; (b), the grains in the alpha2-phase in the deformation tissue are small and uniform; (c), the deformation tissue is subjected to solid solution treatment in an alpha single-phase area for a certain time; (d), the gamma-TiAl alloy can be free of or contain trace element B; (e), the gamma-TiAl alloy tissue can be free of a beta phase. By the preparation method, the problem that the gamma-TiAl alloy part is low in plasticity at room temperature can be effectively solved, the manufacturing process difficulty and the production cost of deformation components are reduced, and the adverse influence of the conventional manufacturing process for the gamma-TiAl alloy small fully-lamellar tissue on mechanical properties is reduced.

Description

technical field [0001] The invention belongs to the field of gamma-TiAl alloy intermetallic compounds, and specifically relates to a method for preparing a fine full-lamellar structure of a gamma-TiAl alloy. Background technique [0002] γ-TiAl alloy has the characteristics of low density, high specific strength, high specific modulus, good flame retardancy and oxidation resistance, etc. High-temperature structural components have broad application prospects. Among them, key structural components with higher safety and reliability requirements need to be thermally deformed to eliminate shrinkage cavity defects and uneven structure properties in the cast structure. Deformed γ-TiAl alloy can obtain four typical microstructures through heat treatment, among which the full lamellar microstructure has excellent room temperature fracture toughness and high temperature mechanical properties, but poor room temperature plasticity restricts its practical application. [0003] The exi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 刘仁慈刘冬崔玉友杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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