Method for preparing TiAl alloy plate without canning

An alloy sheet and alloy technology, applied in the field of preparing TiAl alloy sheet without sheath, can solve the problems of low utilization rate of raw materials, high processing cost, easy introduction of impurities, etc., and achieve the effect of solving reaction melting, avoiding surface oxidation and simplifying the process

Active Publication Date: 2017-05-10
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems that existing ingot metallurgical sheath rolling of TiAl alloy plates has complex procedures, high processing costs, and low utilization rate of raw materials, while the TiAl alloy bars prepared by powder metallurgy are easy to introduce impurities and have high costs, and provide a non-toxic Method for directly extruding TiAl alloy sheet with sheath

Method used

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  • Method for preparing TiAl alloy plate without canning

Examples

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Effect test

Embodiment 1

[0037] The preparation method of Ti-45Al-8Nb alloy plate is as follows:

[0038] (1) Weighing raw materials: according to the atomic percentage of each element, it is composed of 45% Al, 8% Nb, and the balance is Ti and unavoidable impurities. A total of 10,000 g of titanium sponge, pure aluminum, and an 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 ZrO preheated at 600°C 2 In the ceramic mold, a rectangular ingot is obtained.

[0040] (3), billet pretreatment:

[0041] a. Remove the riser from the TiAl alloy ingot and perform hot isostatic pressing treatment. The treatment process is 1260 ° C, 150 MPa, protected by argon atmosphere, kept for 4 hours, and cooled out of the furnace with the furna...

Embodiment 2

[0053] The preparation method of Ti-43Al-9Nb-0.3Y alloy plate is as follows:

[0054] (1) Weighing raw materials: according to the atomic percentage of each element, the composition is 43% Al, 9% V, 0.3% Y, the balance is Ti and unavoidable impurities. Sponge titanium, pure aluminum, aluminum yttrium alloy (Y content is 87.3%) and aluminum vanadium alloy (V content is 52.12%) totaling 10000g were weighed as raw materials.

[0055] (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 1.0×10 -3 mbar; then poured into ZrO preheated at 500°C 2 In the ceramic mold, a rectangular ingot is obtained.

[0056] (3), billet pretreatment:

[0057] a. Remove the riser from the TiAl alloy ingot and perform hot isostatic pressing treatment. The treatment process is 1250 ° C, 150 MPa, protected by argon atmosphere, kept for 4 hours, and cool...

Embodiment 3

[0069] The preparation method of Ti-44Al alloy plate is as follows:

[0070] (1) Weighing the raw material: 44% Al according to the atomic percentage of each element, and the balance being Ti and unavoidable impurities. A total of 10,000 g of titanium sponge and pure aluminum were weighed as raw materials.

[0071] (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 300℃ preheated Al 2 o 3 In the ceramic mold, a rectangular ingot is obtained.

[0072] (3), billet pretreatment:

[0073] a. Remove the riser from the TiAl alloy ingot and perform hot isostatic pressing treatment. The treatment process is 1250 ° C, 160 MPa, protected by argon atmosphere, kept for 4.5 hours, and cooled with the furnace;

[0074] b. Perform near-γ treatment on the ingot, and place the ingot in a vacuum heat treatm...

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Abstract

The invention discloses a method for preparing a TiAl alloy plate without canning in order to solve the problems that an existing ingot metallurgy canning and rolling the TiAl alloy plate is complicated in process, high in machining cost and low in raw material utilization rate, and a TiAl alloy bar prepared through a powder metallurgy method is easy to introduce impurities and is high in cost. The method comprises the specific steps of 1, weighing all raw material ingredients; 2, preparing a casting ingot through induction skull melting of a water-cooling copper crucible and melted model precision casting; 3, carrying out blank pre-treatment; 4, carrying out a first plate extrusion stage; 5, carrying out a second plate extrusion stage, thus obtaining the TiAl alloy plate. According to the method for preparing the TiAl alloy plate without canning, disclosed by the invention, the surface of the obtained plate is smooth and has no cracks, and the TiAl alloy plate is uniformly organized, is small in crystal grain and has excellent mechanical performance.

Description

technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to a method for preparing TiAl alloy plates without sheathing. Background technique [0002] TiAl alloy has low density, high specific strength, and excellent high-temperature oxidation resistance. It has become one of the excellent candidate high-temperature structural materials in the fields of contemporary aviation, aerospace, and civil industries, and has broad application prospects. [0003] TiAl alloy sheets can not only be directly used as structural materials, but also can be processed into parts of aviation and aerospace engines through superplastic forming technology. The preparation of high-performance TiAl alloy sheets is considered to be the key to realize the engineering application of TiAl alloys. However, TiAl alloys have low room temperature plasticity and poor high temperature deformation ability, which limit the preparation and application of TiAl all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22F1/18C22F1/02C22C1/03
CPCC22C1/026C22C1/03C22C14/00C22C21/00C22C30/00C22F1/02C22F1/04C22F1/183
Inventor 韩建超刘燕萍李林峰赵福亮吴波张长江张树志肖树龙陈玉勇
Owner TAIYUAN UNIV OF TECH
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