Method for preparing TiAl alloy clad plate by element powder

A composite plate and element powder technology, which is applied in the field of preparing TiAl alloy composite plate, can solve the problems of unavailable size and thin thickness, etc., and achieve the effect of improving low room temperature plasticity, thin plate thickness, and excellent comprehensive mechanical properties

Inactive Publication Date: 2007-08-08
HARBIN INST OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the prior art cannot obtain a titanium alloy / TiAl alloy composite plate with large size and thin thickness

Method used

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  • Method for preparing TiAl alloy clad plate by element powder

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specific Embodiment approach 1

[0006] Specific embodiment one: (referring to Fig. 1) the technical scheme of the present embodiment is realized through the following steps: one, prepare raw material: get Ti powder, Al powder and other powder, other powder is Nb, Cr, Mn, V, Ni, W, Hf, Ta, Mo, Zr, Si, Y, La, Ce, C, B, TiC, TiB, TiB 2 A mixture of one or more than one powder, the particle size of Ti powder, Al powder and other powders are all less than 200 microns, Ti powder accounts for 35-60 at.% of the total powder in the raw material, and Al powder accounts for 35- 55at.%, the rest is other powders; 2. Powder mixing: mix Ti powder, Al powder and other powders for powder mixing. The mixing time is 1-100 hours, so that several kinds of powders are mixed evenly; 3. Prefabricated board Billet preparation: cold rolled or cold molded powder to obtain a prefabricated slab, the thickness of the prefabricated slab is 0.4-25mm; 4. Wrapping: the prefabricated slab is combined with a certain thickness of titanium allo...

specific Embodiment approach 2

[0007] Embodiment 2: The difference between this embodiment and Embodiment 1 is that a high-temperature rolling step is added, and the titanium alloy / TiAl alloy composite plate obtained in Embodiment 1 is then subjected to high-temperature rolling, and stainless steel is used before rolling. , pure titanium or titanium alloy for sheathing, the thickness of the sheathing is 0.5-20mm, the rolling process is: put the whole material into the heating furnace and heat it to 750-1400℃, keep it warm for 6-45 minutes, and then quickly put it into the rolling mill Start rolling; the deformation of each pass is 4-18%, and the furnace is returned to the furnace for 5-20 minutes between passes. The total deformation of rolling is 10-60%. °C, and air-cooled to room temperature. Through further processing in this embodiment, the obtained plate is denser, thinner, and has better comprehensive mechanical properties.

specific Embodiment approach 3

[0008] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the raw materials are Ti powder, Al powder, Nb powder and Cr powder, the particle size of the powder is 5-30 microns, and the Ti powder accounts for the total amount in the raw materials. 49at.% of powder, 47at.% of Al powder, 2at.% of Nb powder and 2at.% of Cr powder; mix Ti powder, Al powder, Nb powder and Cr powder Powder mixing, the mixing time is 10 hours, so that several powders are mixed evenly, and the mixed element powder is cold molded to obtain a prefabricated slab, the thickness of the prefabricated slab is 7mm; a layer of prefabricated slab and a layer of 3mm The pure titanium plates are placed in layers, and then they are jointly sheathed. The sheath material is 304# stainless steel, and the thickness of the sheath is 2mm; after sheathing, the whole is degassed and sealed; the sealed whole material is subjected to hot isostatic pressing, The hot isostatic ...

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Abstract

The invention relates to the making of TIAl alloy compound plate using element powders, which mixes the element powders like Ti, Al and others in proportion evenly, getting the plate blank after cold rolling or compression, combining the blank and Ti alloy plate with certain thickness for heat compression or hot isostatic treatment to get the compound board. It makes the board with finer structure, thin board, with better comprehensive mechanic feature, being able to make high performance and big size compound board.

Description

technical field [0001] The invention relates to a method for preparing a TiAl alloy composite plate. Background technique [0002] TiAl alloy (or TiAl intermetallic compound) has low density, high specific strength and specific elastic modulus, and can still maintain high enough strength and stiffness at high temperatures, and it also has good creep resistance and oxidation resistance, etc. With outstanding features, it has broad application prospects in the fields of aerospace, aviation and automobiles. The service temperature of TiAl alloy can reach 700-900°C. TiAl alloy sheet is the most urgently needed material in the practical process of this material, but the shortcomings of TiAl alloy sheet, such as low room temperature plasticity and poor processability, seriously hinder the application of the sheet. The patent application number is 200510009906.0, the publication number is CN1672918A, the publication date is September 28, 2005, and the invention patent application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04
Inventor 陈玉勇孔凡涛
Owner HARBIN INST OF TECH
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