Preparation method for TiAl alloy bar

A technology of alloy rods and alloys, which is applied in the field of preparation of TiAl alloy rods, can solve problems such as hot extrusion difficulties, TiAl alloy rods are easy to introduce impurities, and low density, so as to achieve uniform and fine grains and avoid deformation coordination Poor performance, avoid surface oxidation effect

Active Publication Date: 2017-05-10
山西中工重型锻压有限公司
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Problems solved by technology

[0003] The present invention aims at the problems of difficult hot extrusion of existing ingot metallurgical sheathed extrusion TiAl alloy rods, easy introduction of impurities and low density of TiAl alloy rods prepared by powder metallurgy, and provides a direct extruded TiAl alloy without sheathing. alloy bar method

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  • Preparation method for TiAl alloy bar
  • Preparation method for TiAl alloy bar

Examples

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Effect test

Embodiment 1

[0031] The preparation method of Ti-48Al-2Cr-2Nb-3Ni alloy rod is as follows:

[0032] (1) Weighing the raw materials: according to the atomic percentage of each element, the composition is 48% Al, 2% Nb, 2% Cr, 3% Ni, and the balance is Ti and unavoidable impurities. A total of 18000 g of titanium sponge, pure aluminum, high-purity chromium, high-purity nickel and aluminum-niobium alloy (54.56% Nb content) were weighed as raw materials.

[0033] (2) Melting and ingot casting: add the sponge titanium, pure aluminum, high-purity chromium, high-purity nickel and aluminum-niobium alloy weighed in step 1 into a water-cooled copper crucible induction shell melting furnace for melting, and the vacuum degree is 1.0×10 -3 mbar; then poured into a preheated metal mold to obtain an ingot.

[0034] (3) Pretreatment of the extrusion billet: a. The TiAl alloy ingot is subjected to hot isostatic pressing treatment, the hot isostatic pressing process parameters are 1250 ° C, 150 MPa, protec...

Embodiment 2

[0037] The preparation method of Ti-45Al-5Nb alloy bar is as follows:

[0038] (1) Weighing raw materials: according to the atomic percentage of each element, the composition is 45% Al, 5% Nb, and the balance is Ti and unavoidable impurities. A total of 18,000 g of titanium sponge, pure aluminum, and aluminum-niobium alloy (with a Nb content of 54.56%) were weighed as raw materials.

[0039] (2) Melting ingots: Add the sponge titanium, pure aluminum and aluminum-niobium alloy weighed in step 1 into a water-cooled copper crucible induction melting furnace for melting, and the vacuum degree is 3.0×10 -3 mbar; then poured into a preheated metal mold to obtain an ingot.

[0040] (3) Pretreatment of the extrusion billet: a. The TiAl alloy ingot is subjected to hot isostatic pressing treatment. The hot isostatic pressing process parameters are 1250 ° C, 155 MPa, and the argon atmosphere is protected (the mass purity of argon is 99.99%) , keep warm for 5 hours, and cool out of the ...

Embodiment 3

[0044] The preparation method of Ti-43Al alloy bar is as follows:

[0045] (1) Weighing the raw material: 43% Al according to the atomic percentage of each element, and the balance being Ti and unavoidable impurities. A total of 18,000 g of titanium sponge and pure aluminum were weighed as raw materials.

[0046](2) Melting ingots: Add the sponge titanium, pure aluminum and aluminum-niobium alloy weighed in step 1 into a water-cooled copper crucible induction melting furnace for melting, and the vacuum degree is 2.0×10 -3 mbar; then poured into a preheated metal mold to obtain an ingot.

[0047] (3) Pretreatment of the extrusion billet: a. The TiAl alloy ingot is subjected to hot isostatic pressing treatment, the hot isostatic pressing process parameters are 1280°C, 160MPa, and the argon atmosphere is protected (the mass purity of argon is 99.99%) , keep warm for 4 hours, and cool out of the furnace with the furnace, then place the ingot in a box-type muffle furnace, keep it...

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Abstract

The invention discloses a preparation method for a TiAl alloy bar and relates to a preparation method for a bar. The preparation method for the TiAl alloy bar aims at solving the problems that according to a TiAl alloy bar prepared through an existing method, the preparation process is complex, the surface of the bar cracks, the diameter is nonuniform, the bar structure grain size is nonuniform, and TiAl alloy reacts with package materials and is molten when the extrusion temperature is too high. The preparation method for the TiAl alloy bar comprises the specific steps that 1, all raw material components are weighed; 2, a cast ingot is prepared through water cooling copper crucible induction skull melting; 3, pretreatment is conducted on an extrusion blank; and 4, bar extrusion is conducted, and thus the TiAl alloy bar can be obtained. The surface of the TiAl alloy bar obtained through the preparation method is free of cracking, the diameter is uniform, the bar structure grain size is uniform, and the process is simple.

Description

technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to a method for preparing TiAl alloy rods. Background technique [0002] TiAl alloy has low density, high specific strength, and excellent high temperature oxidation resistance, and has broad application prospects in the aerospace field. The existing TiAl alloy bar preparation technology mainly consists of ingot metallurgy technology and powder metallurgy technology. Extruded into TiAl alloy rods. This process has certain requirements on the sheath material and needs to be welded in a vacuum or argon atmosphere. At the same time, this process has certain defects, such as the poor coordination and deformation ability of the sheath material and the TiAl alloy, resulting in uneven diameters of the rods. When the extrusion temperature is too high, the sheath material is easy to react with the TiAl alloy, which affects the quality of the bar. In addition, the surface of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22C1/03C22F1/04C22F1/18C22F1/02B21C25/02
CPCB21C25/025C22C1/026C22C1/03C22C14/00C22C21/00C22C30/00C22F1/02C22F1/04C22F1/183
Inventor 韩建超王旭东张建林韩世平张长江张树志肖树龙陈玉勇
Owner 山西中工重型锻压有限公司
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