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Preparation method of 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, to avoid the effect of surface oxidation

Active Publication Date: 2018-03-16
山西中工重型锻压有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0032] (1) Weigh the raw materials: the composition is 48% Al, 2% Nb, 2% Cr, 3% Ni, and the balance Ti and unavoidable impurities according to the atomic percentage of each element. Weigh 18,000 g of sponge titanium, pure aluminum, high-purity chromium, high-purity nickel, and aluminum-niobium alloy (54.56% Nb content) as raw materials.

[0033] (2) Melting and casting ingots: Put 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 condensing shell melting furnace for smelting, and the vacuum degree is 1.0×10 -3 mbar; then poured into the preheated metal mold to obtain an ingot.

[0034] (3) Pretreatment of the extruded billet: a. The TiAl alloy ingot is processed by hot isostatic pressing. The hot isostatic pressing process parameters are 1250℃, 150MPa, argon atmosphere protection, heat pre...

Embodiment 2

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

[0038] (1) Weigh the raw materials: according to the atomic percentage of each element, the composition is 45% Al, 5% Nb, the balance is Ti and inevitable impurities. Weigh respectively 18000g of sponge titanium, pure aluminum and aluminum-niobium alloy (with 54.56% Nb content) as raw materials.

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

[0040] (3) Pretreatment of the extrusion billet: a. The TiAl alloy ingot is processed by hot isostatic pressing, the hot isostatic pressing process parameter is 1250℃, 155MPa, and argon atmosphere protection (the quality of argon is 99.99%) , Heat preservation for 5h, cool out with the furnace, then put the ingot in a box-type...

Embodiment 3

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

[0045] (1) Weigh the raw materials: the composition is 43% Al according to the atomic percentage of each element, and the balance is Ti and unavoidable impurities. Weigh 18,000 g of sponge titanium and pure aluminum as raw materials.

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

[0047] (3) Pretreatment of the extrusion billet: a. The TiAl alloy ingot is processed by hot isostatic pressing, the hot isostatic pressing process parameters are 1280 ℃, 160 MPa, and argon atmosphere protection (the quality of argon is 99.99%) , Heat preservation for 4h, cool out with the furnace, then place the ingot in a box-type muffle furnace, keep it at 1000°C for 24h, air cooling;...

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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 preparation method of TiAl alloy bars. Background technique [0002] TiAl alloy has low density, high specific strength, excellent high temperature oxidation resistance, and has broad application prospects in the aerospace field. The existing TiAl alloy bar preparation technology is mainly divided into ingot metallurgy technology and powder metallurgy technology. Ingot metallurgy technology is mainly to cut the ingot to obtain the billet, and then the billet is wrapped in a specific temperature range Extruded into TiAl alloy bars. This process has certain requirements for the sheathing 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 sheathing material and TiAl alloy, resulting in uneven diameter of the bar. When the extrusion temperature is...

Claims

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Application Information

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Patent Type & Authority Patents(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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