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Method for preparing TiAl alloy plate by argon atomization in powder metallurgy

A technology of alloy plate and atomized powder, which is applied in metal rolling and other directions, can solve the problems of difficult TiAl alloy plate and less research on TiAl alloy pre-alloyed powder metallurgy technology, and achieve high quality and reliability, uniform deformation, Good overall mechanical properties

Active Publication Date: 2012-06-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0007] Due to the great difficulty in the preparation of TiAl alloy sheets, domestic research on powder metallurgy TiAl alloy sheets generally focuses on the elemental powder method, and there are few studies on TiAl alloy pre-alloyed powder metallurgy technology.

Method used

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Embodiment Construction

[0033] The preparation method of this kind of argon atomized powder TiAl alloy plate is characterized in that: the steps of the method are:

[0034] (1) Raw material preparation

[0035] The TiAl alloy powder is produced by the cold-wall crucible vacuum induction melting argon atomization method, the atomization pressure is between 6 and 9 MPa, the atomized powder is sieved, and the pure TiAl alloy powder with a particle size of less than 250 μm is obtained as a raw material. The chemical composition and atomic percentage at.% of the powder are: Al: 45-48%, Cr: 1-10%, Nb: 1-10%, W: 0-1%, B: 0-0.2%, and the balance is Ti, the oxygen content of the powder is <0.15% by weight;

[0036] (2) Powder package preparation

[0037] The sheath material is stainless steel, pure titanium or titanium alloy. After processing and welding the sheath, clean the sheath with alcohol and dry it in an oven;

[0038] (3) Vacuum degassing

[0039] Argon atomized TiAl alloy powder is heated and va...

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Abstract

The invention relates to a method for preparing a TiAl alloy plate by argon atomization in powder metallurgy. The method comprises the following steps of: reducing the content of inclusions in TiAl alloy powders by purity smelting in a cold-wall crucible and high-purity argon atomization; performing hot isostatic pressure compaction on the high-purity prealloy powder which is atomized by pure argon under such conditions that the temperature is 1100 to 1300 DEG C, the pressure is 140 to 200 MPa and the compaction time is 2 to 4 hours; removing coatings of the alloy blank after hot isostatic pressure compaction and then performing surface treatment and coating; heating alloy and rolling at a high temperature; and removing coatings to obtain a powder TiAl alloy plate. The plate has the advantages of uniform deformation, good surface quality, fine and uniform texture, low oxide and impurity contents, small thickness, good overall mechanical property and high quality and reliability. The method solves the key problems in development and application of TiAl alloy powder-metallurgy plates, and provides a technical support for innovation and progress of civil industry and aerospace industry.

Description

technical field [0001] This patent is a preparation method of argon atomized powder TiAl alloy plate, which belongs to the technical field of powder metallurgy. The method is to prepare TiAl alloy plate by sheathing high-temperature rolling. Background technique [0002] With the rapid development of aviation, national defense and other industries, especially advanced military aircraft require high flexibility and a large propulsion ratio of the engine, the development of key materials is accelerated in the direction of high performance, high reliability and light weight. At the same time, in terms of civil industry, an important problem facing modern automobiles is the pollution caused by the exhaust gas emitted by automobiles. The fundamental way to solve this problem is to increase the combustion rate of fuel, and the lightweight of components is One of the effective means to improve. TiAl alloy has the characteristics of high melting point, low density, high elastic mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/14B22F9/08C22C14/00C22C30/00B21B3/00B23P15/00
Inventor 刘娜李周袁华许文勇张勇
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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