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Method for improving hot processing performance of TiAl alloy

A thermal processing and alloying technology, which is applied in the direction of manufacturing tools and other manufacturing equipment/tools, etc., can solve the problems of poor high-temperature thermal processing performance, high production cost, and narrow thermal processing window of TiAl alloy, so as to improve thermal processing performance and thermal processing performance. Wide processing window and good thermal processing performance at high temperature

Inactive Publication Date: 2010-09-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of high production cost, poor high-temperature thermal processing performance and narrow thermal processing window of the existing methods for improving the thermal processing performance of TiAl alloys, and provides a method for improving the thermal processing performance of TiAl alloys. method

Method used

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  • Method for improving hot processing performance of TiAl alloy
  • Method for improving hot processing performance of TiAl alloy
  • Method for improving hot processing performance of TiAl alloy

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specific Embodiment approach 1

[0016] Specific embodiment one: the method for improving the hot workability of TiAl alloy in this embodiment is carried out according to the following steps:

[0017] 1. Melting: first add Mo element to TiAl alloy, and then use water-cooled copper crucible induction melting method to produce TiAl alloy ingot;

[0018] 2. Hot isostatic pressing: heat-preserve the TiAl alloy ingot at a temperature of 1250-1280°C and a pressure of 130-140Mpa for 4-5 hours, then cool it with the furnace and take it out of the furnace;

[0019] 3. Homogenization annealing: the TiAl alloy ingot obtained after hot isostatic pressing is heat-preserved at a temperature of 1250-1300°C for 12-24 hours, then cooled with the furnace and taken out of the furnace;

[0020] 4. Wire electric discharge cutting: cutting the TiAl alloy ingot obtained after homogenizing annealing into cylindrical ingots;

[0021] 5. Wrapping sealing welding: Spray the glass lubricant with a thickness of 0.1-0.15mm on the surface...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2, the temperature is 1270° C. and the pressure is 135 Mpa, and the heat preservation treatment is carried out for 4.5 hours. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0027] Specific embodiment 3: This embodiment differs from specific embodiments 1 to 2 in that: in step 3, heat preservation treatment is carried out at a temperature of 1270° C. for 16 hours. Other steps and parameters are the same as those in Embodiments 1 to 2.

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Abstract

The invention discloses a method for improving hot processing performance of TiAl alloy, which relates to a method for improving the hot processing performance of alloy and solves the problems that the conventional method for improving the hot processing performance of the TiAl alloy has high manufacturing cost and the manufactured TiAl alloy has poor high-temperature hot processing performance and narrow hot processing window. The method comprises the following steps of: 1, smelting; 2, hot isostatic pressing; 3, homogenizing annealing; 4, electro-spark wire cutting; 5, sheathing and sealing; 6, heat preservation and hot extrusion to improve the hot processing performance of the TiAl alloy. The TiAl alloy manufactured by the method has wide hot processing window and good high-temperature hot processing performance; and compared with the conventional multi-step hot mechanical processing method for improving the hot processing performance of the TiAl alloy, the manufacturing method of the invention reduces the cost by over 50 percent.

Description

technical field [0001] The invention relates to a method for improving the thermal processing performance of an alloy. Background technique [0002] The research and application of high-temperature structural materials is an important factor for the revolutionary change and development of aerospace propulsion systems in the 21st century. Due to its excellent high-temperature performance, TiAl intermetallic compound has become a new type of lightweight high-temperature structural material that has been widely concerned and rapidly developed at home and abroad, and has entered the stage of practical research. The NASA report pointed out that by 2020, the amount of TiAl-based alloys and their composite materials will account for about 20% of aerospace engines. [0003] By controlling and optimizing the microstructure of TiAl-based alloys, an alloy with a fine-grained full-lamellar structure can be obtained, which can basically solve the defect that the tensile strength, plasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/04
Inventor 单德彬徐文臣张浩柏杨吕炎
Owner HARBIN INST OF TECH
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