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Grain refining heat treatment method for Ti-44Al-4Nb-4V-0.3Mo alloy

A technology of ti-44al-4nb-4v-0.3mo and 1.ti-44al-4nb-4v-0.3mo is applied in the field of thermal processing technology of titanium aluminum alloy, which can solve the problems of unfavorable mechanical properties, titanium aluminum alloy casting, etc. Coarse grains of the structure and inability to obtain fine and uniform problems can reduce the reaction temperature, refine the structure and increase the reaction speed.

Active Publication Date: 2017-11-24
山西中工重型锻压有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the titanium-aluminum alloy casting structure has coarse grains, which is not conducive to the improvement of mechanical properties. The current thermomechanical treatment cannot obtain a fine and uniform structure.

Method used

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  • Grain refining heat treatment method for Ti-44Al-4Nb-4V-0.3Mo alloy
  • Grain refining heat treatment method for Ti-44Al-4Nb-4V-0.3Mo alloy

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Experimental program
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Effect test

Embodiment 1

[0015] 1. Heat the Ti-44Al-4Nb-4V-0.3Mo alloy to 1250°C, and perform isothermal forging, with a deformation of 80%;

[0016] 2. Air-cool the deformed Ti-44Al-4Nb-4V-0.3Mo alloy to make solid solution of Nb, V and Mo into the high-temperature α phase of Ti-44Al-4Nb-4V-0.3Mo alloy to obtain supersaturated Ti- α phase of 44Al-4Nb-4V-0.3Mo alloy;

[0017] 3. Put the Ti-44Al-4Nb-4V-0.3Mo alloy treated in step 2 in a high-temperature furnace at 950°C for 30 minutes, and cool down with the furnace to ensure the discontinuous reaction. A fine-grained titanium-aluminum alloy structure with a grain size of less than 5 μm is obtained.

[0018] Adopt the backscatter imaging technique (SEM-BSE) under the scanning electron microscope to amplify 4000 times and detect this method to prepare fine-grained titanium-aluminum alloy, such as figure 1 shown by figure 1 It can be seen that the titanium-aluminum alloy prepared by this method is very fine.

Embodiment 2

[0020] 1. Heat the Ti-44Al-4Nb-4V-0.3Mo alloy to 1200°C, and perform isothermal forging, with a deformation of 85%;

[0021] 2. Air-cool the deformed Ti-44Al-4Nb-4V-0.3Mo alloy to make solid solution of Nb, V and Mo into the high-temperature α phase of Ti-44Al-4Nb-4V-0.3Mo alloy to obtain supersaturated Ti- α phase of 44Al-4Nb-4V-0.3Mo alloy;

[0022] 3. Put the Ti-44Al-4Nb-4V-0.3Mo alloy treated in step 2 in a high-temperature furnace at 1000°C for 30 minutes, and cool down with the furnace to ensure the progress of the discontinuous reaction. A fine-grained titanium-aluminum alloy structure with a grain size of less than 5 μm is obtained.

[0023] Adopt the backscatter imaging technique (SEM-BSE) under the scanning electron microscope to amplify 4000 times and detect this method to prepare fine-grained titanium-aluminum alloy, such as figure 2 shown by figure 2 It can be seen that the titanium-aluminum alloy prepared by this method is very fine.

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Abstract

The invention relates to a hot working treatment technology for an titanium-aluminum alloy, in particular to a grain refining heat treatment technology for a Ti-44Al-4Nb-4V-0.3Mo alloy. A grain refining heat treatment method for the Ti-44Al-4Nb-4V-0.3Mo alloy comprises the steps that the Ti-44Al-4Nb-4V-0.3Mo alloy is heated to an alpha+beta two-phase region of a Ti-44Al alloy, isothermal high-temperature deformation is carried out on the Ti-44Al-4Nb-4V-0.3Mo alloy, then air cooling is carried out, and finally heat treatment is carried out on the air-cooled structure so as to obtain the fine and uniform fine-grain structure finally. The method has the advantage that the subsequent machining capability of the titanium-aluminum alloy can be improved.

Description

technical field [0001] The invention relates to a heat treatment process of titanium-aluminum alloy, in particular to a Ti-44Al-4Nb-4V-0.3Mo alloy fine-grain heat treatment process. Background technique [0002] Titanium-aluminum alloy has excellent high-temperature oxidation resistance and creep resistance, and excellent high-temperature strength below 750 ° C. It is a potential material for spacecraft skins and engine panels. However, the coarse grains of the titanium-aluminum alloy cast structure are not conducive to the improvement of mechanical properties, and the current thermomechanical treatment cannot obtain a fine and uniform structure. Contents of the invention [0003] The technical problem to be solved by the present invention is: the technical problem to be solved by the present invention is how to heat treat the Ti-44Al-4Nb-4V-0.3Mo alloy casting, so that the alloy can obtain a uniform fine-grained structure. [0004] The technical solution adopted in the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 张树志张长江侯赵平赵玉彬宋志文韩建超徐萌
Owner 山西中工重型锻压有限公司
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