Beta-single-phase solidification TiAl-based alloy and structure control method thereof

A control method and alloy-based technology, applied in self-solidification, chemical instruments and methods, single crystal growth, etc., can solve the problems of poor plasticity of β-solidified TiAl alloys, improve high-temperature oxidation resistance, and improve high-temperature creep resistance Performance, the effect of improving high temperature strength

Inactive Publication Date: 2017-11-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of poor plasticity of existing β-solidified TiAl alloys, the present invention provides a β-single-phase solidified TiAl-based alloy and its microstructure control method

Method used

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  • Beta-single-phase solidification TiAl-based alloy and structure control method thereof
  • Beta-single-phase solidification TiAl-based alloy and structure control method thereof
  • Beta-single-phase solidification TiAl-based alloy and structure control method thereof

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specific Embodiment approach 1

[0021] Embodiment 1: The alloy composition of a β single-phase solidified TiAl-based alloy according to the present embodiment is composed of 44% Al, 5.0% Nb, 1.5%-3.5% Cr, 0.5%- Composition of 1.5% W, 0.1%-0.5% Si and the rest Ti.

specific Embodiment approach 2

[0022] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the alloy composition of a β single-phase solidified TiAl-based alloy is 44% Al, 5.0% Nb, 2.5% Al Composition of Cr, 1.0% of W, 0.3% of Si and the balance of Ti. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0023] Specific implementation mode three: a microstructure control method of a β single-phase solidified TiAl-based alloy according to this implementation mode is carried out according to the following steps:

[0024] 1. Weigh sponge titanium, high-purity aluminum, aluminum-niobium master alloy, aluminum-chromium Master alloys, aluminum-tungsten master alloys and high-purity silicon, using water-cooled copper crucible induction melting method to prepare master alloy ingots;

[0025] 2. Cut the master alloy ingot obtained in step 1 into a cylindrical rod, polish the surface to remove the oxide layer, and then put it into a cylindrical rod with Y 2 o 3 Coated Al 2 o 3 In the ceramic tube, connect the ceramic tube to the pull rod in the Bridgman directional solidification device protected by high-purity argon, start the heating system of the Bridgman directional solidification device, heat to a temperature of 1500-1800 ° C, and at 1500-1800 Keep warm for 10min to 40min under...

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Abstract

The invention belongs to the technical field of high-temperature alloy structure control and particularly relates to a beta-single-phase solidification TiAl-based alloy and a structure control method thereof. According to the beta-single-phase solidification TiAl-based alloy and the structure control method thereof, the problem that the plasticity of an existing beta solidification TiAl alloy is poor is solved. The alloy component of the beta-single-phase solidification TiAl-based alloy is composed, by atom, of 44% of Al, 5.0% of Nb, 1.5-3.5% of Cr, 0.5-1.5% of W, 0.1-0.5% of Si and the balance Ti. The structure control method comprises the steps that firstly, a master alloy ingot is prepared through a water cooling copper crucible induction smelting method; and secondly, the master alloy ingot is cut into a cylindrical rod, and directional solidification is conducted with the temperature gradient being 10-30 DEG C / mm at a pulling rate of 3-100 [mu]m / s, and the beta-single-phase solidification TiAl-based alloy is obtained.

Description

technical field [0001] The invention belongs to the technical field of microstructure control of superalloys, and in particular relates to a β single-phase solidified TiAl-based alloy and a microstructure control method thereof. Background technique [0002] Ti-Al-based alloy is a medium and high-temperature structural material with excellent performance, and its density is less than 50% of that of nickel-based alloys. It has light weight, high specific strength, high specific stiffness, corrosion resistance, wear resistance, high temperature resistance and excellent Antioxidant properties and so on. In recent years, people have added a large amount of β-phase stabilizing elements to the TiAl alloy, so that the primary phase formed during the liquid / solid phase transition of the alloy in the early stage of solidification is the β phase, and the β single phase is directly transformed into the α phase through solid phase transformation. , during the solidification process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03C30B11/00C30B29/52
CPCC22C14/00C22C1/03C30B11/00C30B29/52
Inventor 苏彦庆刘桐骆良顺王亮李新中陈瑞润郭景杰傅恒志
Owner HARBIN INST OF TECH
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