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Blisk with bicrystal structure and manufacturing method thereof

A technology of an integral blisk and a manufacturing method, applied in the field of manufacturing, can solve the problems of poor fatigue resistance and easy failure of the integral blisk, achieve good fatigue resistance, solve the poor fatigue resistance, and avoid the effects of mutation

Active Publication Date: 2020-05-22
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an integral blisk with twin-crystal structure and a manufacturing method thereof. In the integrated blisk provided by the invention, the blisk has a fine equiaxed crystal structure, the blade has a thick columnar crystal structure, and the boss has a The gradually larger transition crystal structure and the transition crystal structure of the boss effectively solve the problem of poor fatigue resistance and easy failure of the overall blisk caused by the mismatch of crystal structure between the disc and the blade

Method used

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  • Blisk with bicrystal structure and manufacturing method thereof
  • Blisk with bicrystal structure and manufacturing method thereof
  • Blisk with bicrystal structure and manufacturing method thereof

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preparation example Construction

[0045] In the present invention, the preparation method of the roulette with equiaxed crystal structure preferably includes:

[0046] Machining the alloy after casting to obtain a wheel disc with equiaxed crystal structure;

[0047] Or, forging the alloy and machining it to obtain a wheel disc with equiaxed crystal structure;

[0048] Alternatively, alloy powder metallurgy is used to obtain a wheel disc with equiaxed crystal structure.

[0049] The present invention does not have any special requirements for the specific implementation method of mechanically processing the wheel disk with equiaxed crystal structure after alloy casting, and it is only necessary to adopt methods well known to those skilled in the art.

[0050] The present invention does not have any special requirements for the specific implementation method for obtaining a wheel disk with equiaxed crystal structure by mechanical processing after alloy forging, and a method well known to those skilled in the art may be us...

Embodiment 1

[0075] (1) Preparation of equiaxed crystal roulette

[0076] The GH4169 alloy powder is sintered to obtain a pre-formed wheel at a sintering temperature of 1150°C; the pre-formed wheel is heated to 1080°C in a high-temperature furnace and then forged in a forging die. The relative density of the material after hot forging can reach more than 99%, and the wheel can obtain a uniform equiaxed crystal structure, and the average grain size of the equiaxed crystal structure is 20μm.

[0077] (2) Boss processing

[0078] The bosses with rounded corner transition characteristics are processed on the wheel disc with equiaxed crystal structure by wire cutting by traditional machining. The height of the boss is 5mm, and the length and width of the boss are at the same position as the hub. The blades are of the same size and the upper surface of the boss is milled flat.

[0079] (3) Surface heat treatment of the boss

[0080] Wrap the roulette with asbestos insulation cloth to expose the boss. I...

Embodiment 2

[0091] (1) Preparation of equiaxed crystal roulette

[0092] Use TC4 titanium alloy powder to press into the desired shape under 400MPa pressure. Afterwards, sintering is carried out in a high-temperature furnace or vacuum furnace with a protective atmosphere. The sintering temperature is 1200℃ and the sintering time is 2h. During the sintering process, the powder particles undergo a series of physical chemistry such as diffusion, recrystallization, welding, compounding, and dissolution. Through the process, a wheel disk with equiaxed grain structure is finally obtained, and the average grain size of equiaxed grain structure is 25 μm.

[0093] (2) Boss processing

[0094] The bosses with rounded transition characteristics are processed on the wheel disc with equiaxed crystal structure by traditional machining method. The height of the boss is 5mm, and the length and width of the boss are at the same position as the hub. The size is equivalent, the upper surface of the boss is mille...

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Abstract

The invention relates to the technical field of manufacturing, and provides a blisk with a bicrystal structure. The blisk comprises a wheel disk, a boss and a blade; the inner side of the boss is connected with the wheel disk, and the outer side of the boss is connected with the blade; the wheel disk has an isometric crystal structure; the blade has a columnar crystal structure; and the boss has acrystal grain structure which gradually becomes larger from inside to outside. In the provided blisk, as the boss has the crystal grain structure which gradually becomes larger from inside to outside, a transition effect on fine isometric crystals and bulky columnar crystals in the wheel disk and the blade is achieved, it is avoided that a huge difference of the grain structures of the blade andthe wheel disk leads to a sudden change of the mechanical properties of the blisk, and the problems that the blisk is poor in fatigue resistance and liable to fail can be effectively solved. Besides,in the blisk, as the wheel disk has the fine isometric crystal structure, the blisk can have good fatigue resistance; and as the blade has the directionally solidified structure characteristics of thecolumnar crystals, the blisk still has good creep performance at high temperature.

Description

Technical field [0001] The present invention relates to the field of manufacturing technology, in particular to an integral blisk with twin crystal structure and a manufacturing method thereof. Background technique [0002] The integral blisk technology is one of the core technologies for the new generation of aero-engines to achieve structural innovation and technological leapfrogging. It integrates the rotor blades of the engine and the wheel disc, which reduces the airflow loss of the tenon and improves the starting efficiency on the basis of simplifying the traditional aero engine manufacturing process. Compared with the traditional structure, it has the advantages of weight reduction, grade reduction, efficiency increase and reliability improvement. [0003] At present, the manufacturing methods of integral blisks mainly include precision milling, precision welding manufacturing, and integral precision casting. Among them, the precision washing processing mainly relies on th...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D9/32B22F3/105B22F5/00C22C14/00C22C19/05C22C30/00C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22F1/10C23C24/10F01D5/34F01D5/28B33Y10/00
CPCC21D9/0068C21D9/32C23C24/103C22C19/056C22F1/10B22F5/00C22C14/00C22C19/07C22C30/00C22C38/48C22C38/44C22C38/50C22C38/06C22C38/02C22C38/04C22C38/002F01D5/34F01D5/28B33Y10/00F05D2300/174F05D2300/175F05D2300/171B22F10/00B22F10/36B22F10/66B22F10/366B22F10/25B22F10/64B22F10/34Y02P10/25
Inventor 刘奋成吕飞阅黄春平刘秀霞
Owner NANCHANG HANGKONG UNIVERSITY