Preparation method of TiAl alloy with fine grain full synusia tissue

A layered and fine-grained technology, which is applied in the field of TiAl alloy preparation, can solve the problems of difficult casting of TiAl alloy and high cost of preparation methods, and achieve the effects of cost reduction, good mechanical properties, and reduced production costs

Inactive Publication Date: 2010-08-11
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that it is difficult to cast a TiAl alloy with a fine-grained full-lamellar structure with excellent mechanical properties in the existing casting method and the problem of the high cost of the existing TiAl alloy with a fine-grained full-lamellar structure. Provided is a method for preparing a TiAl alloy with a fine-grained full-lamellar structure

Method used

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  • Preparation method of TiAl alloy with fine grain full synusia tissue
  • Preparation method of TiAl alloy with fine grain full synusia tissue
  • Preparation method of TiAl alloy with fine grain full synusia tissue

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specific Embodiment approach 1

[0009] Specific Embodiment 1: The preparation of the TiAl alloy with fine-grained full-layer lamellar structure in this embodiment is carried out according to the following steps: 1. Melting: adopt a water-cooled copper crucible induction melting method to obtain a TiAl alloy ingot, wherein Al in the TiAl alloy ingot is 42at.%~43at.%; 2. Hot isostatic pressing: TiAl alloy ingots are kept at a temperature of 1250-1280°C and a pressure of 130-140MPa for 4-5 hours, and then cooled out of the furnace; 3. EDM Wire cutting: Cut the TiAl alloy ingot obtained after hot isostatic pressing into a cylindrical ingot; 4. Sheath sealing welding: spray the glass lubricant with a thickness of 0.1 to 0.15mm on the surface of the cylindrical ingot, Then wrap the aluminum silicate fiber with a thickness of 2-7mm to obtain the matrix, then place the matrix in the middle of the stainless steel pipe and weld the two ends of the stainless steel pipe with stainless steel plates with a thickness of 2-7...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment is different from Embodiment 1: in step 1, Al in the TiAl alloy ingot is 42 at.%; other steps and parameters are the same as Embodiment 1.

specific Embodiment approach 3

[0012] Embodiment 3: This embodiment is different from Embodiments 1 to 2: In step 2, the temperature is 1270° C. and the pressure is 135 MPa, and the temperature is kept for 4.5 hours. Other steps and parameters are the same as those in Embodiments 1 to 2.

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Abstract

The invention relates to a preparation method of TiAl alloy with fine grain full synusia tissue. The invention solves the problems that the existing casting method is difficult to cast TiAl alloy with fine grain full synusia tissue in excellent mechanical property and the existing preparation method of TiAl alloy with fine grain full synusia tissue is high in cost. The method includes: firstly, melting; secondly, hot isostatic pressing; thirdly, electrospark wire-electrode cutting; fourthly, sheath sealing and soldering; fifthly, heat preservation and hot extrusion, thus obtaining the TiAl alloy with fine grain full synusia tissue. The organizational chart of the TiAl alloy of the invention shows that the TiAl alloy obtained by the invention has fine grain full synusia tissue; compared with the existing preparation method of TiAl alloy with fine grain full synusia tissue, the cost of the method of the invention is reduced by 50-70%.

Description

technical field [0001] The invention relates to a preparation method of TiAl alloy. Background technique [0002] TiAl intermetallic compounds have high specific strength, specific stiffness, excellent oxidation resistance and creep resistance, and higher flame retardancy than conventional titanium alloys, so they are considered to be promising high-temperature structural materials. Adding metal elements such as Nb (5at.%-10at.%) can increase the service temperature of TiAl alloy by 50-100°C, and increase the strength at room temperature by 300-500Mpa, thereby further expanding the use range of TiAl alloy to nearly 1000°C. The high performance of TiAl alloy makes it gradually show remarkable development prospects in aerospace materials, and has become the material of choice for high-pressure compressors and low-pressure turbine blades of advanced military aircraft engines. The NASA report pointed out that by 2020, the amount of TiAl-based alloys and their composite material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P17/04
Inventor 张浩徐文臣单德彬吕炎李新安
Owner HARBIN INST OF TECH
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