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Smelting method for high-Nb-TiAl based alloy

A base alloy and smelting technology, which is applied to the smelting field of high Nb-TiAl base alloys, can solve the problems of non-friction, cracking, segregation, etc., and achieve the effects of no segregation and inclusion, uniform composition and simple method.

Active Publication Date: 2014-05-07
西安超晶科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of producing high Nb-TiAl based alloys by traditional technology, it is easy to form defects such as non-melting lumps, segregation, and cracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Taking Ti-48at%Al-7at%Nb-2.5at%V-1at%Cr alloy as an example, the specific steps of melting are as follows:

[0035] 1) Ingredients:

[0036] Sponge titanium, aluminum beans, aluminum vanadium alloy, niobium titanium alloy and metal chromium were weighed to prepare Ti-48at%Al-7at%Nb-2.5at%V-1at%Cr alloy.

[0037] 2) Preparation of electrode block:

[0038] The above weighed aluminum-vanadium alloy, niobium-titanium alloy, and metal chromium are mixed into granular sponge titanium to form a mixture A. Divide the mixture A into three equal parts: A1, A2, A3, and divide the aluminum beans into two equal parts, namely B1 and B2; Then pour into A2, sprinkle B2 evenly on it, and rake it; finally pour A3, rake it, and press it into a single electrode block with a weight of 10Kg with a press, a total of 3 pieces.

[0039] 3) One smelting:

[0040] A single electrode block is used as a consumable electrode for smelting in a vacuum consumable electric arc furnace. A copper cru...

Embodiment 2

[0053] Taking Ti-45at%Al-8.5at%Nb-0.2at%W-0.2at%B-0.02at%Y alloy as an example, the specific steps of the melting method are as follows:

[0054] 1) Ingredients:

[0055]Weigh titanium sponge, niobium-titanium alloy, aluminum beans, tungsten powder, titanium diboride, and metal yttrium to prepare Ti-45at%Al-8.5at%Nb-0.2at%W-0.2at%B-0.02at%Y alloy .

[0056] 2) Preparation of electrode block:

[0057] Mix the above-mentioned weighed niobium-titanium master alloy, tungsten powder, titanium diboride, and metal yttrium into granular sponge titanium to form a mixture A. Divide the mixture A into three equal parts: A1, A2, A3, and divide the aluminum beans into two equal parts, namely B1 and B2; ; Then pour into A2, spread B2 evenly on it, and rake it; finally pour into A3. After raking, use a press to press into 3 electrode blocks with a single weight of 10Kg.

[0058] 3) One smelting:

[0059] A single electrode block is used as a consumable electrode for smelting in a vacuu...

Embodiment 3

[0072] Taking Ti-46at%Al-9at%Nb-0.9at%B alloy as an example, the specific steps are as follows:

[0073] 1) Ingredients:

[0074] Weigh titanium sponge, niobium-titanium alloy, aluminum beans, and titanium diboride to prepare Ti-46at%Al-9at%Nb-0.9at%B alloy.

[0075] 2) Preparation of electrode block:

[0076] Mix the niobium-titanium alloy and titanium diboride weighed above into granular sponge titanium to form a mixture A. Divide the mixture A into three equal parts: A1, A2, A3, and divide the aluminum beans into two equal parts, namely B1 and B2; Then pour into A2, sprinkle B2 evenly on it, and rake it; finally pour A3, rake it, and press it into a single electrode block with a weight of 10Kg with a press, a total of 3 pieces.

[0077] 3) One smelting:

[0078] A single electrode block is used as a consumable electrode for smelting in a vacuum consumable electric arc furnace. During smelting, a copper crucible with a diameter of 190mm is used to obtain a primary ingot ...

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Abstract

The invention provides a smelting method for a high-Nb-TiAl based alloy. According to the smelting method, titanium sponge, a niobium-titanium alloy and aluminum shots are used as raw materials and are pressed and welded to form a consumable electrode; the consumable electrode is smelted in a vacuum consumable electric arc furnace to obtain the high-Nb-TiAl based alloy. According to the smelting method, an electrode block is prepared by a manner of combining material mixing and material distribution; the vacuum consumable electric arc furnace is used for carrying out three times of smelting; after the materials are discharged from the furnace, the materials are slowly cooled by adopting a manner of sand burying treatment or annealing treatment so that the high-Nb-TiAl based alloy with uniformly-distributed components and no cracks can be obtained. The smelting method for the high-Nb-TiAl based alloy is simple in method and strong in maneuverability; with the adoption of the method, the high-Nb-TiAl based alloy with the uniformly-distributed components and no segregation or impurities can be produced.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and in particular relates to a melting method for high-Nb-TiAl-based alloys. Background technique [0002] Titanium-aluminum alloy has the advantages of light weight, high specific strength, corrosion resistance, wear resistance, high temperature resistance and oxidation resistance, and has excellent mechanical properties at room temperature and high temperature. It has become an excellent candidate in the fields of contemporary aerospace, weapons and civil industries. As one of the high-temperature structural materials, it has important engineering application potential. [0003] High Nb alloying brings the development of TiAl alloy into a new stage. The yield strength at room temperature can reach 800MPa, and the high temperature strength at 760°C can reach 550MPa. At the same time, the original room temperature tensile elongation is maintained, especially the oxidation resistan...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C30/00
Inventor 刘娣寇宏超白钰唐斌薛祥义李金山
Owner 西安超晶科技股份有限公司
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