Method for low segregation and uniform microstructure refinement of high niobium titanium aluminum alloy

A technology of titanium-aluminum alloy with uniform structure, which is applied in the field of low segregation and uniform structure refinement of high-niobium titanium-aluminum alloy, which can solve the problems of high production cost, low material utilization rate, and poor structure uniformity, and achieve short cycle time and high material utilization High rate, reduce the effect of cracking tendency

Active Publication Date: 2016-04-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the problems of poor structure uniformity caused by segregation of high niobium titanium aluminum alloy in the prior art, as well as low material utilization rate and high production cost, the present invention proposes a method for low segregation and uniform structure refinement of high niobium titanium aluminum alloy

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  • Method for low segregation and uniform microstructure refinement of high niobium titanium aluminum alloy
  • Method for low segregation and uniform microstructure refinement of high niobium titanium aluminum alloy
  • Method for low segregation and uniform microstructure refinement of high niobium titanium aluminum alloy

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Embodiment 1

[0033] This embodiment is a method for high niobium titanium aluminum alloy with low segregation and uniform structure refinement.

[0034] The concrete process of this embodiment is:

[0035] Step 1, raw material preparation. The raw material preparation includes the preparation of the high niobium titanium aluminum alloy test bar and the preparation of the corundum crucible.

[0036] Preparation of high-niobium titanium-aluminum alloy test rod: wire cutting is used to cut an alloy test rod of Φ18×20 mm, and the high-niobium titanium-aluminum alloy is Ti45Al8Nb0.2W0.02Y0.2B alloy. The obtained high-niobium-titanium-aluminum alloy test rod was ground and ultrasonically cleaned.

[0037] Preparation of corundum crucible: Prepare the surface layer material with yttrium oxide powder and zirconium acetate sol at a weight ratio of 4.5:1, and evenly coat the surface layer material on the inner surface of the corundum crucible, dry it naturally for 48 hours and place it in a heat t...

Embodiment 2

[0044] This embodiment is a method for high niobium titanium aluminum alloy with low segregation and uniform structure refinement.

[0045] The concrete process of this embodiment is:

[0046] Step 1, raw material preparation. The raw material preparation includes the preparation of the high niobium titanium aluminum alloy test bar and the preparation of the corundum crucible.

[0047] Preparation of the high-niobium titanium-aluminum alloy test rod: the alloy test rod of Φ18×20 mm is cut by wire cutting, and the high-niobium titanium-aluminum alloy is Ti42Al10Nb alloy. The obtained high-niobium-titanium-aluminum alloy test rod was ground and ultrasonically cleaned.

[0048] Preparation of corundum crucible: The surface layer material was made of yttrium oxide powder and zirconium acetate sol at a weight ratio of 3.5:1, evenly coated on the inner surface of the corundum crucible, dried naturally for 48 hours, placed in a heat treatment furnace, and sintered at 950°C for two ...

Embodiment 3

[0054] This embodiment is a method for high niobium titanium aluminum alloy with low segregation and uniform structure refinement.

[0055] The concrete process of this embodiment is:

[0056] Step 1, raw material preparation. The raw material preparation includes the preparation of the high niobium titanium aluminum alloy test bar and the preparation of the corundum crucible.

[0057] Preparation of high-niobium titanium-aluminum alloy test rod: wire cutting is used to cut an alloy test rod of Φ18×20 mm, and the high-niobium titanium-aluminum alloy is Ti45Al5Nb0.2W0.2B alloy. The obtained high-niobium-titanium-aluminum alloy test rod was ground and ultrasonically cleaned.

[0058] Preparation of corundum crucible: Yttrium oxide powder and zirconium acetate sol were prepared as a surface layer material at a weight ratio of 3.8:1, evenly coated on the inner surface of the corundum crucible, dried naturally for 48 hours, placed in a heat treatment furnace, and sintered at 950°...

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Abstract

Disclosed is a method for high niobium titanium aluminum alloy low segregation and structure uniformization and refinement. The structure uniformization and refinement can be implemented at the high temperature ranging from 1460 to 1540 DEG C, uniformized and fine initial structure can be obtained before ductile brittle transition of the high niobium titanium aluminum alloy, and the cracking tendency of the alloy is lowered. Compared with the method of adding refining agent, the method has the advantages that external impurities are avoided, the alloy solidification path is not changed, and deterioration of the properties of the alloy is avoided; operation is simple, the period is short, material utilizing rate is increased by 40%, and production cost is reduced greatly as compared with that of a heating treatment and heat-processing grain refinement method.

Description

technical field [0001] The invention relates to the field of metal solidification manufacturing, in particular to a technology for achieving low segregation and uniform and refined structure of high-niobium titanium-aluminum alloy through constant temperature treatment in the solidification process. Background technique [0002] Titanium-aluminum alloy is an alloy with low specific gravity and excellent high-temperature performance, making it a promising structural material in the fields of aviation, aerospace and automobile manufacturing. Traditional titanium-aluminum alloys such as Ti-48Al-2Cr-2Nb can serve at 650°C to 750°C. In order to further increase the service temperature of titanium-aluminum alloys, a high-temperature high-temperature Performance titanium aluminum alloy, Nb, W and other high melting point elements are added in this patent, and a high niobium titanium aluminum alloy system with a composition range of Ti-(42-45)Al-(5-10)Nb is proposed, which improves ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/04
Inventor 寇宏超杨光王军杨劼人李金山胡锐薛祥义
Owner NORTHWESTERN POLYTECHNICAL UNIV
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