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Method for weakening phase-change texture of high-niobium titanium-aluminum alloy

A titanium-aluminum alloy and high-niobium technology, which is applied in the field of weakening the phase change texture of high-niobium titanium-aluminum alloy, can solve the problems of reduced production efficiency, long holding time, and α grain growth, so as to reduce stress concentration and weaken Cracking tendency, short cycle time effect

Active Publication Date: 2018-06-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat treatment can significantly reduce the content of phase change texture, but at the cost of long holding time or slow cooling rate, on the one hand, it will lead to a significant reduction in production efficiency, and on the other hand, it will lead to a sharp growth of α grains , thus forming a coarse lamellar structure

Method used

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  • Method for weakening phase-change texture of high-niobium titanium-aluminum alloy
  • Method for weakening phase-change texture of high-niobium titanium-aluminum alloy
  • Method for weakening phase-change texture of high-niobium titanium-aluminum alloy

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Embodiment 1

[0030] Figure 7 It is a flowchart of an embodiment of the present invention, such as Figure 7 As shown, a method for weakening the phase transformation texture of high niobium titanium aluminum alloy includes:

[0031] (1) Preparation of high-niobium titanium-aluminum alloy test rods. Wire cutting is used to intercept alloy test rods of Φ8×12 mm. The high-niobium titanium-aluminum alloy is Ti40Al8Nb0.5B alloy. The obtained high-niobium-titanium-aluminum alloy test rod was ground and ultrasonically cleaned.

[0032] (2) Vacuumize and backfill with argon, put the test rod into the thermal simulation testing machine, and use the pressure head to fix the test rod. The chamber of the thermal simulator is evacuated to 1 Pa, and after the evacuation is completed, the chamber is filled with argon to 0.06 MPa. Repeat the above-mentioned vacuuming-argon backfilling process once, and then enter step 3 to heat the alloy test rod.

[0033] (3) Heating. The high-niobium titanium-alumi...

Embodiment 2

[0038] Figure 7 It is a flowchart of an embodiment of the present invention, such as Figure 7 As shown, a method for weakening the phase transformation texture of high niobium titanium aluminum alloy includes:

[0039] (1) Preparation of high-niobium titanium-aluminum alloy test rods. Wire cutting is used to cut alloy test rods of Φ8×12 mm. The high-niobium titanium-aluminum alloy is Ti45Al10Nb0.5B alloy. The obtained high-niobium-titanium-aluminum alloy test rod was ground and ultrasonically cleaned.

[0040] (2) Vacuumize and backfill with argon, put the test rod into the thermal simulation testing machine, and use the pressure head to fix the test rod. Evacuate the chamber of the thermal simulator to 9 x 10 -2 Pa, fill the chamber with argon gas to 0.06MPa after vacuuming. Repeat the above-mentioned vacuuming-argon backfilling process twice, and then proceed to step 3 to heat the alloy test rod.

[0041] (3) Heating. The high-niobium titanium-aluminum alloy test rod wa...

Embodiment 3

[0045] Figure 7 It is a flowchart of an embodiment of the present invention, such as Figure 7 As shown, a method for weakening the phase transformation texture of high niobium titanium aluminum alloy includes:

[0046] (1) Preparation of high-niobium titanium-aluminum alloy test rods. Wire cutting is used to intercept alloy test rods of Φ8×12 mm. The high-niobium titanium-aluminum alloys are Ti42Al5Nb1B alloys. The obtained high-niobium-titanium-aluminum alloy test rod was ground and ultrasonically cleaned.

[0047] (2) Vacuumize and backfill with argon, put the test rod into the thermal simulation testing machine, and use the pressure head to fix the test rod. The chamber of the thermal simulator is evacuated to 0.4×10-1Pa, and after the evacuation is completed, the chamber is filled with argon to 0.06MPa. Repeat the above-mentioned vacuuming-argon backfilling process once, and then enter step 3 to heat the alloy test rod.

[0048] (3) Heating. The high-niobium titanium...

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Abstract

The invention discloses a method for weakening the phase-change texture of a high-niobium titanium-aluminum alloy, and belongs to the technical field of metal hot-working. According to the method forweakening the phase-change texture of the high-niobium titanium-aluminum alloy, the phase-change texture of the titanium-aluminum alloy is weakened through pre-deformation of a beta single-phase area,operation is easy, the cycle is short, and the production cost is greatly reduced. Compared with a heat treatment method, the method has a short cycle. Compared with a boron adding method, through pre-deformation of the beta single-phase area of the high-niobium titanium-aluminum alloy, thick strip-shaped TiB can be crushed, and thus, the number of heterogeneous nucleation mass points for promoting a non-texture alpha phase is increased. Meanwhile, due to different deformation mechanisms of TiB and a beta phase, the orientation relationship between TiB and the beta phase is changed in the pre-deformation process, the original orientation relationship: {110}betaI (001) and (111) betaI [001] TiB is destroyed, so that it is ensured that the alpha phase separated from borides is a non-texturealphas phase, stress concentration of the high-niobium titanium-aluminum alloy is reduced, crank growth channels are made random, and the tearing tendency of the alloy is weakened.

Description

technical field [0001] The invention relates to the technical field of metal thermal processing, in particular to a method for weakening the phase transformation texture of high-niobium titanium-aluminum alloys. Background technique [0002] Titanium-aluminum alloy has the advantages of low density, high specific rigidity, and high specific strength, and has great application prospects in the fields of aerospace and automobile manufacturing. The temperature range of traditional titanium-aluminum alloys is 650°C to 750°C, which severely limits its application range. In order to increase the service temperature of titanium-aluminum alloy, high melting point elements such as Nb and W are usually added to titanium-aluminum alloy to form a high-niobium titanium-aluminum alloy system with a composition range of Ti-(40-45)Al-(5-10)Nb , improve the high-temperature strength and oxidation resistance of titanium-aluminum alloy, and make its service temperature reach 800°C-900°C. Due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F1/02
CPCC22F1/02C22F1/183
Inventor 杨光任威宋文杰刘延辉王朋义于旻
Owner SHAANXI UNIV OF SCI & TECH
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