Direct control method for titanium-aluminum-niobium alloy lamellar structure

A technology of direction control and titanium-aluminum-niobium, which is applied in chemical instruments and methods, self-solidification methods, crystal growth, etc., can solve problems such as uneven composition and properties of directionally solidified alloys, complex preparation processes, etc.

Inactive Publication Date: 2012-09-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the preparation process is complex, and the composition of the seed crystal is usually diffe

Method used

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  • Direct control method for titanium-aluminum-niobium alloy lamellar structure
  • Direct control method for titanium-aluminum-niobium alloy lamellar structure
  • Direct control method for titanium-aluminum-niobium alloy lamellar structure

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Experimental program
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Effect test

Embodiment 1

[0032] The research composition is Ti-46Al-5Nb (49Ti-46Al-5Nb) alloy, the experiment adopts the typical Bridgman method, when the vacuum reaches 5x10 -3 After Pa, the protective gas high-purity argon is introduced to make the vacuum degree reach -0.068MPa, and then the electric heating is applied to raise the temperature above the melting point of titanium-aluminum alloy, and the temperature is kept for 8 minutes, and then pulled at a speed of 30μm / s. Under experimental conditions G=5.2×10 3 K / m, when the drawing length is half of the sample length, start the quick quenching device to retain the solid-liquid interface shape at the drawing rate. Then, samples were cut from the directional solidification samples for microstructure observation, and the growth conditions of the first solidified β-phase dendrites, the growth conditions of the peritectic phase in the quenching zone along the growth direction and perpendicular to the direction of directional solidification, and the ...

Embodiment 2

[0035] The titanium-aluminum alloy whose composition is Ti-45Al-8Nb(W, B, Y) (47Ti-45Al-8Nb) is studied. The experiment adopts the typical Bridgman method. When the vacuum degree reaches 5x10 -3 After Pa, the protective gas high-purity argon is introduced to make the vacuum degree reach -0.06MPa, and then the electric heating is applied to raise the temperature above the melting point of titanium-aluminum alloy. Under experimental conditions G=3.8×10 3 K / m, when the drawing length is half of the sample length, start the quick quenching device to retain the solid-liquid interface shape at the drawing rate. After the system was cooled to room temperature, the sample was taken out and polished on multiple surfaces, and the sample was cut from the directionally solidified sample for microstructure observation. The growth conditions perpendicular to the direction of directional solidification, the grain size and crystal orientation of the peritectic phase transformation process w...

Embodiment 3

[0037] The titanium-aluminum alloy whose composition is Ti-46Al-2Nb (52Ti-46Al-2Nb) is studied. The experiment adopts the typical Bridgman method. When the vacuum degree reaches 5x10 -3 After Pa, the protective gas high-purity argon is introduced to make the vacuum degree reach -0.05MPa, and then the electric heating is applied to raise the temperature above the melting point of titanium-aluminum alloy. Under experimental conditions G=7.7×10 3 K / m, when the drawing length is 45mm, start the quick quenching device to retain the solid-liquid interface morphology at the drawing rate. After the system was cooled to room temperature, the sample was taken out and polished on multiple surfaces, and the sample was cut from the directionally solidified sample for microstructure observation. The growth conditions perpendicular to the direction of directional solidification, the grain size and crystal orientation of the peritectic phase transition process were analyzed, and it was foun...

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Abstract

The invention discloses a direct control method for a titanium-aluminum-niobium alloy lamellar structure, and belongs to the technical field of control research of high-temperature alloy structures. The method is a control method for a titanium-aluminum alloy structure based on a full peritectic transformation process. By applying a directional solidification technology, the alloy is controlled to be subjected to full peritectic reaction by changing solidification conditions (temperature gradient G and drawing speed V), so that primary beta phase dendritic crystals are fully dissolved in a solidification process, and adverse effects which may be probably caused by the beta phase to the alloy structure are eliminated; and thus, the aim of controlling the direction of the lamellar structure is fulfilled. The method can be realized only in a normal Bridgman directional solidification system, so that the defects of complex preparation process and non-uniform components and performance in a seed crystal method are overcome; the method is a new method for directly controlling the orientation of titanium-aluminum-niobium alloy directionally solidified lamellas through a non-seed crystal method, and has great significance to improving the performance of the titanium-aluminum alloy; and the industrial application of the directionally solidified titanium-aluminum alloy is promoted.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy microstructure control research, and relates to a method for controlling the microstructure direction of a titanium-aluminum-niobium alloy sheet. Background technique [0002] Peritectic alloys are widely used engineering alloys. Many important engineering materials have peritectic reactions during preparation, which has attracted great attention from researchers. As a typical peritectic alloy, titanium aluminum alloy has the advantages of light weight, high specific strength, high specific rigidity, corrosion resistance, wear resistance, high temperature resistance and excellent oxidation resistance, and has excellent mechanical properties at room temperature and high temperature , the service temperature can reach 700-900 ℃, and it is one of the excellent candidate high-temperature structural materials in the fields of aerospace industry, weapon industry and civil industry. Titan...

Claims

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Application Information

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IPC IPC(8): B22D27/20
CPCC30B29/52B22D27/04C30B11/006B22D27/20C30B29/605
Inventor 丁贤飞林均品张黎伟王永胜程芳叶丰
Owner UNIV OF SCI & TECH BEIJING
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