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Method for improving superplasticity of semi-stable beta titanium alloy

A technology of β titanium alloy and superplasticity, which is applied in the field of titanium alloy, can solve the problems of limiting the wide application of metastable β titanium alloy and low superplasticity of metastable β titanium alloy, and achieve the effect of increasing elongation and increasing superplasticity

Active Publication Date: 2016-06-08
江西景航航空锻铸有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the superplasticity of metastable β titanium alloy is low, which limits the wider application of metastable β titanium alloy in superplastic forming process.

Method used

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  • Method for improving superplasticity of semi-stable beta titanium alloy
  • Method for improving superplasticity of semi-stable beta titanium alloy
  • Method for improving superplasticity of semi-stable beta titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The metastable β titanium alloy Ti-15Mo-3Al-2.7Nb-0.2Si was placed in an XY-1200 high-temperature box-type resistance furnace for pre-aging treatment. The temperature in the resistance furnace was limited to 520°C. The metastable β titanium alloy was After 20 minutes of heat preservation in the resistance furnace, take it out and cool it naturally in the air, and the cooled metastable β titanium alloy according to figure 1 The samples shown were processed and then tested on a SANS-CMT4104 electronic tensile testing machine at 840°C and 0.001s -1 Under the condition of the strain rate, the tensile performance test is carried out, and the sample after fracture is as follows Figure 4 As shown, the obtained elongation was 287%.

Embodiment 2

[0049] On the basis of the pre-aging treatment parameters in Example 1, keep the pre-aging temperature 520°C unchanged, change the pre-aging time, the pre-aging time is 40min and 70min respectively, and the metastable β titanium alloy Ti-15Mo-3Al-2.7Nb- 0.2 Si is placed in XY-1200 high temperature box-type resistance furnace for pre-aging treatment, and then it is taken out and cooled naturally in the air, and the cooled metastable β titanium alloy is figure 1 The samples shown were processed and then tested on a SANS-CMT4104 electronic tensile testing machine at 840°C and 0.001s -1 Under the condition of the strain rate, the tensile property test is carried out. After the pre-aging temperature is 520 ℃, and the pre-aging holding time is 40min, the fractured sample is as follows: Figure 5 As shown, the obtained elongation rate is 361.8%, and the pre-aging treatment is 520 ° C for 70 min after fracture. Figure 6 As shown, the obtained elongation was 303%. Comparing the elon...

Embodiment 3

[0051] On the basis of the pre-aging treatment parameters in Example 3, keep the pre-aging heat preservation time 40min unchanged, change the pre-aging temperature, the pre-aging temperature is 440°C, 480°C and 545°C respectively, and the metastable β titanium alloy Ti-15Mo- 3Al-2.7Nb-0.2Si was placed in an XY-1200 high-temperature box-type resistance furnace for pre-aging treatment, and then it was taken out and cooled naturally in the air, and the cooled metastable β-titanium alloy was figure 1 The samples shown were processed and then tested on a SANS-CMT4104 electronic tensile testing machine at 840°C and 0.001s -1 Under the condition of the strain rate, the tensile performance test is carried out. The pre-aging treatment after the pre-aging temperature is 440 ° C and the pre-aging holding time is 40 minutes is shown in 7. The obtained elongation is 174%, and the pre-aging treatment is 480 ℃ holding for 40min after breaking the sample such as Figure 8 As shown, the obtai...

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Abstract

The invention provides a method for improving superplasticity of a semi-stable beta titanium alloy. The method is used for preageing treatment of the semi-stable beta titanium alloy. According to the method, the semi-stable beta titanium alloy is subjected to preageing treatment for 20-70 min at the temperature of 440-545 DEG C, a certain quantity of alpha phases are separated out from the semi-stable beta titanium alloy, the alpha phases are separated out in a beta crystal boundary position firstly, the hardness of the alpha phases is higher than that of beta phases, the alpha phases with high hardness perform stress concentration relative to matrix beta phases, beta-phase grains are fined to a certain extent, the finer the crystal grains are, the better the superplasticity is, and the superplasticity of the semi-stable beta titanium alloy is further improved. The elongation of the treated semi-stable beta titanium alloy reaches 361.8% and is increased by 167.8% by comparison with the elongation of an untreated semi-stable beta titanium alloy.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a method for improving the superplasticity of a metastable β titanium alloy. Background technique [0002] The superplasticity of metal means that the material exhibits abnormally low rheological resistance and abnormally high rheological properties under certain internal conditions of grain shape, grain size and phase composition structure, and certain external conditions of temperature and strain rate. For example, the elongation rate is as high as several hundred percent. [0003] The application of superplastic forming technology is more and more extensive. The superplasticity of titanium alloy is mainly studied on the basis of the plastic properties of titanium alloy itself. The application of superplastic forming of titanium alloy mainly includes: superplastic isothermal forging, air pressure Forming, superplastic extrusion, vacuum forming, etc. [0004] Metastabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22F1/183
Inventor 董洪波邹忠波
Owner 江西景航航空锻铸有限公司
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