Preparing method for large-size beta-gamma TiAl alloy plate

A technology of alloy sheet and large size, which is applied in the field of preparation of TiAl alloy sheet, can solve problems such as narrow thermal processing window of TiAl alloy, easy cracking of sheet, and sheet fracture, so as to improve comprehensive mechanical properties, avoid cracking, and increase final rolling temperature Effect

Inactive Publication Date: 2017-10-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the plate is easy to crack and difficult to form due to the narrow thermal processing window of the TiAl alloy and the temperature drop in the non-isothermal rolling process during

Method used

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specific Embodiment approach 1

[0030] Specific embodiment 1: This embodiment is a method for preparing a large-size beta-gamma TiAl alloy sheet, which is specifically completed according to the following steps:

[0031] 1. Preparation of TiAl alloy blank:

[0032] The TiAl alloy preform is prepared by the method of TiAl secondary forging and billeting, and then the TiAl alloy preform is subjected to hot isostatic pressing, the hot isostatic pressing temperature is 1000 ℃ ~ 1250 ℃, the hot isostatic pressing pressure is 140 MPa ~ 200 MPa , The hot isostatic pressing time is 1h-5h, and then the TiAl alloy preform blank after the hot isostatic pressing treatment is processed into a block blank by the mechanical processing method to obtain the TiAl alloy blank;

[0033] The nominal chemical composition of the TiAl alloy mentioned in step one is Ti-(40~45)Al-(7~9)X-(0.1~0.5)Z(at%), where X is a stable beta element and Z is a trace amount Alloying elements

[0034] The TiAl alloy blank mentioned in step one has a thickn...

specific Embodiment approach 2

[0054] Specific embodiment two: this embodiment is different from specific embodiment one in that the beta stabilizing element described in step one is one or a mixture of several of Cr, V and Mn. The other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0055] Specific embodiment three: This embodiment is different from specific embodiment one or two in that, in step three, the TiAl alloy blank with a smooth surface and the inside of the groove sheath are sprayed with a glass lubricant with a thickness of 1.5 mm to 3 mm. The other steps are the same as the first or second embodiment.

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Abstract

The invention discloses a preparing method for a large-size beta-gamma TiAl alloy plate and relates to a preparing method for the TiAl alloy plate. According to the purpose, the problems that due to the fact that a TiAl alloy hot working window is narrow, the plate is likely to be cracked and is hardly formed in the large-size TiAl alloy plate preparing process due to cooling in the non-isothermal rolling process, and secondary cracking of the plate is caused in the machining sheath removing process are solved. The method includes the steps that firstly, a TiAl alloy blank is prepared; secondly, a sheath is machined; thirdly, a glass lubricating agent is sprayed; fourthly, the TiAl alloy blank is subjected to sealing; fifthly; a high-temperature rolling stage is conducted; sixthly, residual stress is removed through homogenizing heat treatment; and seventhly, the sheath is removed through machining, and the large-size beta-gamma TiAl alloy plate is obtained. The preparing method is suitable for preparing of the large-size beta-gamma TiAl alloy plate.

Description

Technical field [0001] The invention relates to a method for preparing TiAl alloy plates. Background technique [0002] TiAl alloy has good physical and mechanical properties, and the density is less than half of that of Ni-based alloy (3.9~4.2g / cm 3 ), is considered a high-temperature structural material with great development potential. After years of research, the development of TiAl alloy has entered the practical stage. At present, TiAl alloy missile tails, automobile exhaust valves and engine turbine blades prepared by casting, forging and superplastic forming methods have been widely used in aerospace vehicles and automobile engines. And other fields. However, with the rapid development of aviation and aerospace technology, in order to further improve the overall performance of the aircraft, higher requirements have been put forward for the overall weight reduction and endurance of the aircraft. The development of traditional high-temperature Ti alloys has reached the lim...

Claims

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Application Information

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IPC IPC(8): C22F1/18B21C37/02B21B45/02B21B37/74
CPCB21B37/74B21B45/0242B21C37/02C22F1/183
Inventor 陈玉勇张宇孔凡涛王晓鹏
Owner HARBIN INST OF TECH
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