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Preparation method of beta-gamma TiAl alloy sheet containing fine lath-like γ-recrystallized structure

A technology of recrystallization structure and alloy sheet, which is applied in the field of preparing TiAl alloy sheet, can solve the problems of low alloy fracture toughness, complex heat treatment process, and low tensile strength, so as to improve the tensile performance at room temperature, save the tedious heat treatment process, The effect of uniform and fine tissue

Inactive Publication Date: 2019-01-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems that current beta-gamma TiAl alloys have low fracture toughness, low tensile strength, complex heat treatment process and high cost, and provide beta-gammaTiAl alloy plates containing fine lath-like gamma recrystallized structures preparation method

Method used

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  • Preparation method of beta-gamma TiAl alloy sheet containing fine lath-like γ-recrystallized structure
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  • Preparation method of beta-gamma TiAl alloy sheet containing fine lath-like γ-recrystallized structure

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specific Embodiment approach 1

[0023] Specific embodiment one: the present embodiment is the preparation method of the beta-gammaTiAl alloy sheet material that contains fine lath-like γ recrystallization structure, specifically carries out according to the following steps:

[0024] 1. Preparation of TiAl alloy blank: forging and opening the TiAl alloy prefabricated blank to prepare the TiAl alloy prefabricated blank, then subjecting the TiAl alloy prefabricated blank to hot isostatic pressing, and then using mechanical processing to process the TiAl alloy prefabricated blank after hot isostatic pressing into Cuboid blank, obtains TiAl alloy blank;

[0025] The parameters of the hot isostatic pressing treatment described in step 1 are: the temperature of the hot isostatic pressing is 1000°C to 1250°C, the pressure of the hot isostatic pressing is 140MPa to 200MPa, and the time of the hot isostatic pressing is 1h to 5h;

[0026] The thickness of the TiAl alloy blank described in step 1 is 3 mm to 30 mm;

[0...

specific Embodiment approach 2

[0033] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the machining method described in step 1 is wire cutting. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0034] Specific embodiment 3: This embodiment differs from specific embodiment 1 or 2 in that: the parameters for preparing the TiAl alloy prefabricated billet by forging blank described in step 1 are: the initial forging temperature is 1220°C-1260°C, and the deformation rate is 0.005s -1 ~0.05s -1 , The total deformation is 65% to 85%. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a beta-gamma TiAl alloy panel containing fine lath-shaped gamma recrystallization textures and relates to a TiAl alloy panel preparation method. The preparation method aims at solving the technical problems that at present, a beta-gamma TiAl alloy is low in fracture toughness, low in tensile strength, complex in heat treatment process and high in cost. The preparation method comprises the steps of 1, preparation of a TiAl alloy blank; 2, package sheathing; 3, the rolling stage; 4, stress relief annealing; and 5, machining to remove a package. According to the preparation method, the TiAl alloy panel containing fine lath-shaped gamma recrystallization textures is directly obtained through a low-temperature package rolling means; and comprehensive mechanical performance of the TiAl alloy panel can be improved, meanwhile, the process of the TiAl alloy panel is simplified, and manufacturing cost is saved. The method is used for preparing the beta-gamma TiAl alloy panel containing the fine lath-shaped gamma recrystallization textures.

Description

technical field [0001] The invention relates to a method for preparing TiAl alloy plate. Background technique [0002] With the advancement of modern industrial technology, the development of aerospace has put forward higher requirements for high-temperature structural materials, and the high performance and lightweight of new materials have become the trend of future development. As a light-weight high-temperature structural material, TiAl alloy has low density, high specific strength and specific stiffness, excellent oxidation resistance and high-temperature creep performance, etc., and has broad application prospects in the aerospace field. However, the narrow thermal processing window and poor high-temperature deformation ability of TiAl alloys bring great challenges to the thermal processing of TiAl alloys, especially for the rolling of TiAl alloy sheets, which further restricts the practical engineering applications of TiAl alloys. [0003] After years of in-depth and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/183
Inventor 陈玉勇张宇孔凡涛王晓鹏
Owner HARBIN INST OF TECH
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