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Alloying method for improving high-temperature performance of directionally solidified titanium-aluminum alloy and prepared titanium-aluminum alloy

A titanium-aluminum alloy, directional solidification technology, applied in the direction of improving energy efficiency, improving process efficiency, manufacturing tools, etc., can solve problems such as easy contamination of melts, and achieve solutions to easy contamination of melts, reducing melt contamination, and hindering position. The effect of wrong movement

Pending Publication Date: 2022-07-05
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to solve the problem that the melt is easily polluted during the directional solidification process and further improve the high-temperature performance of titanium-aluminum alloy, the invention provides an alloying method for improving the high-temperature performance of directional solidification titanium-aluminum alloy and the prepared titanium-aluminum alloy

Method used

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  • Alloying method for improving high-temperature performance of directionally solidified titanium-aluminum alloy and prepared titanium-aluminum alloy
  • Alloying method for improving high-temperature performance of directionally solidified titanium-aluminum alloy and prepared titanium-aluminum alloy
  • Alloying method for improving high-temperature performance of directionally solidified titanium-aluminum alloy and prepared titanium-aluminum alloy

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Embodiment 1

[0035] This embodiment provides an alloying method for improving the high temperature performance of directionally solidified titanium-aluminum alloy. The method is completed by using electromagnetic cold crucible directional solidification forming equipment. The equipment mainly includes the following components: (1) Electromagnetic field melting system, mainly including water cooling Copper crucible and electromagnetic induction coil; (2) Cooling system, mainly including water cooling of crucible and furnace body and cooling of titanium aluminum alloy by container containing cooling liquid during solidification; (3) Motion system, mainly including pulling system and The feeder system is driven by two independent servo systems; (4) The vacuum system mainly consists of a diffusion pump, a vacuum pump and a vacuum chamber; (5) The control system is mainly responsible for the precise control of heating power and vacuum during the directional solidification process parameters such...

Embodiment 2

[0042] This embodiment provides an alloying method for improving the high temperature performance of directionally solidified titanium-aluminum alloy. The method is completed by using electromagnetic cold crucible directional solidification forming equipment. The equipment mainly includes the following components: (1) Electromagnetic field melting system, mainly including water cooling Copper crucible and electromagnetic induction coil; (2) Cooling system, mainly including water cooling of crucible and furnace body and cooling of titanium aluminum alloy by container containing cooling liquid during solidification; (3) Motion system, mainly including pulling system and The feeder system is driven by two independent servo systems; (4) The vacuum system mainly consists of a diffusion pump, a vacuum pump and a vacuum chamber; (5) The control system is mainly responsible for the precise control of heating power and vacuum during the directional solidification process parameters such...

Embodiment 3

[0049] Based on the same electromagnetic cold crucible directional solidification molding equipment as in Embodiment 2, the present embodiment provides an alloying method for improving the high temperature performance of directional solidification titanium-aluminum alloy, including the following steps:

[0050] Step 1. A ternary high-niobium-titanium-aluminum alloy ingot is prepared by primary arc melting and secondary vacuum induction melting. The composition ratio of the titanium-aluminum alloy ingot is composed of the following atomic percentages: Al 45.89at.%, Nb 7.08at %, W0.44at.%, Cr 0.63at.%, B 0.11at.%, the balance is Ti, and the sum of each component is 100%;

[0051] The primary arc smelting is to prepare the alloy raw material into a primary smelting ingot by using the vacuum consumable arc smelting equipment commonly used in the prior art. Then put the first smelted ingot into the cold crucible vacuum induction melting furnace for secondary smelting. First, use a ...

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Abstract

The invention relates to an alloying method for improving the high-temperature performance of a directional solidification titanium-aluminum alloy and the prepared titanium-aluminum alloy, and belongs to the technical field of directional solidification of titanium-aluminum alloys. In order to solve the problem that a melt is easy to pollute in the directional solidification process, the alloying method for improving the high-temperature performance of the directional solidification titanium-aluminum alloy is provided, in electromagnetic cold crucible directional solidification forming equipment, a titanium-aluminum alloy ingot casting round bar is melted under the action of electromagnetic induction heating in the downward movement process and drops into a molten pool one by one, and the titanium-aluminum alloy ingot casting round bar is formed. And the molten pool moves downwards and is directionally solidified under the action of cooling liquid to obtain a directionally solidified titanium-aluminum alloy sample. According to the method, soft contact of the melt and the crucible is achieved, melt pollution of the titanium-aluminum alloy in the casting process is effectively reduced, the using temperature of the titanium-aluminum alloy is increased, the columnar crystal structure and the strip-shaped B2 phase distance are refined, the strengthening and toughening effect is enhanced by adding trace elements of W, Cr and B, and the mechanical property of the titanium-aluminum alloy in the axial direction is improved.

Description

technical field [0001] The invention belongs to the technical field of directional solidification of titanium-aluminum alloys, and in particular relates to an alloying method for improving the high-temperature performance of directional-solidified titanium-aluminum alloys and the prepared titanium-aluminum alloys. Background technique [0002] Due to its low density, high specific strength and specific stiffness, good oxidation resistance and creep resistance, and high resistance to crack propagation, titanium-aluminum alloys have a very wide range of application prospects in aerospace and automotive energy fields. Compared with the nickel-based superalloys that are widely used now, TiAl-based alloys have superior high-temperature performance. The operating temperature can reach 700 to 900 °C, and the density is only half that of nickel-based superalloys. Therefore, it is considered to be a promising nickel-based high-temperature alloy. Alternative materials for alloys, whic...

Claims

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Application Information

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IPC IPC(8): C22F1/18C21D1/42C21D1/78C21D11/00
CPCC22F1/183C21D1/42C21D1/785C21D11/00Y02P10/25
Inventor 丁宏升徐雪松黄海涛梁贺陈瑞润郭景杰傅恒志
Owner HARBIN INST OF TECH
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