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Novel Beta/Gamma-TiAl alloy with ultra-fine grain

A technology of ultra-fine grains and alloys, applied in the field of TiAl alloys, which can solve the problems of the influence of the grain size of the alloy structure and the difference in influence.

Inactive Publication Date: 2013-11-27
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effects of different β-phase stabilizing elements on the microstructure of β / γ-TiAl alloys are different, and the compound addition of β-phase stabilizing elements will have a great impact on the alloy microstructure, especially the grain size.

Method used

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  • Novel Beta/Gamma-TiAl alloy with ultra-fine grain
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  • Novel Beta/Gamma-TiAl alloy with ultra-fine grain

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Selection of raw materials

[0044] The purity of each metal component selected for the preparation of the master alloy ingot of the present invention is shown in Table 1, and the alloy composition is Ti-43Al-6Nb-1Cr-1Mo-0.2B (atomic percentage).

[0045] (2) Preparation of master alloy ingot

[0046] Under the protection of high-purity argon gas, a water-cooled copper crucible electromagnetic induction suspension melting equipment is used to melt master alloy ingots. The specific procedures are as follows:

[0047] 1) After the surface of the metal raw material is mechanically polished to remove the oxide skin on the surface, the material is prepared according to the designed composition ratio, and the weight of each ingot is about 40g. Vacuum down to 5×10 -3 Pa; Fill the furnace with a certain amount of high-purity argon gas (99.999%), and the pressure range of argon gas is 0.8~1.0MPa. Half the weight of Al is smelted together with other alloys int...

Embodiment 2

[0053] Using the same composition as in Example 1, the master alloy ingot preparation method adopts non-consumable arc melting in a water-cooled copper crucible, and its specific procedures are as follows:

[0054] 1) After mechanically grinding the surface of the metal raw material to remove the oxide skin on the surface, prepare the material according to the designed composition ratio; put the prepared material into the water-cooled copper crucible in the melting furnace according to the weight of about 40g per ingot, cover Vacuum the upper furnace cover to 2×10 -3 Pa; fill a certain amount of high-purity argon (99.999%) into the furnace, and the pressure range of argon is 0.4~0.6MPa.

[0055] 2) Before melting the master alloy ingot, melt the Ti ingot used for gas absorption 2~3 times.

[0056] 3) Multi-pass smelting master alloy ingots: use non-consumable tungsten electrodes to first melt Ti, Nb, Cr, Mo and other high melting point components together unde...

Embodiment 3

[0059] Using the same preparation method as in Example 1, the alloy composition is Ti-43Al-4Nb-4Mo-0.2B (atomic percentage). Such as Figure 4 , the obtained alloy has an average grain size of 10 μm, while stabilizing a large amount of β-phase to room temperature and enriching at the lamellar grain boundaries ( Figure 5 , 6 ), but black long strips of B compound Ti appeared in the tissue 2 B, will affect the processing properties of the alloy.

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Abstract

The invention discloses an novel beta / gamma-TiAl alloy with the ultra-fine grain. The novel Beta / Gamma-TiAl alloy comprises the following chemical components according to atomic percent: 40-45% of Al, 2-9% of Nb, 0-4% OF Cr, 0-6% of Mo, 0.1-0.3% of B, and the balance of Ti. The preparation method of the alloy comprises the following steps: electromagnetical induction and smelting in suspension by a water-cooling copper crucible, or consumable arc melting by the water-cooling copper crucible. Through the compound addition of different Beta-phase stable elements, the TiAl alloy laminated structure with the uniform structure and the uniform grain of 10 micrometers is obtained in the cast condition, and a large number of Beta-phase stable elements are stabilized to the room temperature and enriched at the grain boundary of the laminated grain.

Description

technical field [0001] The invention belongs to the technical field of TiAl alloys. Specifically, a novel beta / gamma-TiAl alloy with as-cast ultrafine grains with a large amount of beta phase preserved on the lamellar grain grain boundaries is invented through rational design of alloy components. Background technique [0002] γ-TiAl-based alloy has good comprehensive properties such as low density, high temperature strength and elastic modulus, strong creep resistance and oxidation corrosion resistance, and is considered to have development potential in aerospace, automobile, energy, weapon and other industrial fields. High temperature structural materials. However, due to the coarse structure and strong anisotropy of the γ-TiAl alloy, the grain size is between 150 and 500 μm, resulting in poor room temperature plasticity and low hot deformation ability of this alloy, which limits its wide application. At present, through alloying, heat treatment, sheathed isothermal forg...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02
Inventor 陈光王广甫彭英博陈锋
Owner NANJING UNIV OF SCI & TECH
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