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Method for preparing B and Y contained fine grain TiAl alloy

An alloy and fine-grained technology, which is applied in the field of TiAl alloy preparation, can solve the problems of poor room temperature performance of the alloy, excessive addition of refinement effect, and insufficient addition amount, so as to reduce machining costs, small structure size, The effect of improving usability

Inactive Publication Date: 2016-03-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of refining the TiAl alloy structure by adding B and Y elements, the addition amount is too small to achieve the refinement effect, and the addition amount is too much to cause poor room temperature performance of the alloy, and to provide a TiAl alloy containing The preparation method of the fine-grained TiAl alloy of B, Y

Method used

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  • Method for preparing B and Y contained fine grain TiAl alloy
  • Method for preparing B and Y contained fine grain TiAl alloy
  • Method for preparing B and Y contained fine grain TiAl alloy

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specific Embodiment approach 1

[0018] Specific embodiment one: the preparation method of a fine-grained TiAl alloy containing B and Y in this embodiment is carried out according to the following steps

[0019] 1. The titanium sponge, aluminum ingot, boron powder and yttrium-aluminum intermediate alloy are pressed into blocks by a metal briquetting machine to obtain a block; before briquetting, the titanium sponge is divided into two parts, and the layers from bottom to top are respectively One part of titanium sponge, aluminum ingot, boron powder, yttrium-aluminum master alloy and another part of titanium sponge;

[0020] 2. Put the block obtained in step 1 into a water-cooled copper crucible induction melting furnace, and then evacuate the water-cooled copper crucible vacuum induction melting furnace to 1.0×10 -3 mbar~3.0×10 -3 mbar, then increase the smelting power to 85kW-90kW at a rate of 10kW / min-15kW / min, and then smelt at a constant power of 85kW-90kW for 300s-360s to obtain a melt;

[0021] 3. Pre...

specific Embodiment approach 2

[0024] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mass purity of the sponge titanium described in step one is 99.7%, the mass purity of the described aluminum ingot is 99.99%, the mass purity of the described boron powder The mass purity is 99.99%, and the mass purity of the yttrium-aluminum master alloy is 99.99%. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0025] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, the block obtained in step one is put into a water-cooled copper crucible induction melting furnace, and then the water-cooled copper crucible vacuum induction melting furnace is pumped Vacuum to 1.8×10 -3 mbar. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for preparing a TiAl alloy, in particular to a method for preparing a B and Y contained fine grain TiAl alloy. The method aims at solving the problems that the refining effect cannot be achieved due to the fact that the addition amount generated by adding B and Y to refine the structure of the TiAl alloy is too small, and the room temperature performance of the alloy is poor due to the fact that the addition amount is too large. The method comprises the steps that 1, a titanium sponge, an aluminum ingot, alloying element X matter, boron powder and yttrium-aluminum intermediate alloy are briquetted and formed through a metal briquetting machine, and a block is obtained; 2, the block obtained in the step 1 is placed into a water cooling copper crucible induction melting furnace to be smelted, and a melt is obtained; and 3, a metal cast is preheated firstly, then the melt obtained in the step 2 is cast into the preheated metal cast, furnace cooling is carried out after casting, and the B and Y contained fine grain TiAl alloy is obtained. The slice layer group structure size of the B and Y contained fine grain TiAl alloy is small, the use performance of TiAl alloy is improved, the utilization rate of TiAl alloy is increased, and the cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of TiAl alloy. Background technique [0002] TiAl alloy is a new type of high-temperature structural material, which has the advantages of high melting point, low density, high elastic modulus, good high-temperature strength, flame retardancy, and oxidation resistance. It is a new type of lightweight material with broad application prospects. Heat-resistant high-temperature structural materials are considered to be one of the structural materials for next-generation aero-engines with great competitive potential. However, the coarse structure and low room temperature plasticity of TiAl alloy limit its wide application. For decades, scholars at home and abroad have done a lot of exploration and research on the structure and properties of TiAl alloys. The results show that by adding a certain amount of B, Y and other elements, borides, yttrium oxides, and carbides hinder the dendrite growth of TiAl alloys du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03
CPCC22C14/00C22C1/03
Inventor 陈玉勇贾燚肖树龙田竟徐丽娟韩建超曹守臻
Owner HARBIN INST OF TECH