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Vacuum melting and slab casting method of titanium-aluminum alloy

A vacuum smelting and titanium-aluminum alloy technology, which is applied in the field of titanium-aluminum alloy slab processing, can solve problems such as composition segregation, lack of uniform structure, and metallurgical defects.

Inactive Publication Date: 2014-03-19
安徽宝泰特种材料有限公司 +1
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Problems solved by technology

[0005] Due to the difference in the melting point and density of the constituent elements of the TiAl-based alloy compound, there will inevitably be metallurgical defects and composition segregation in the ingot, which will make the subsequent thermomechanical processing uncontrollable, and the uniform structure will not be obtained, seriously affecting its comprehensive mechanical properties. performance and high temperature oxidation resistance

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  • Vacuum melting and slab casting method of titanium-aluminum alloy

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[0011] Process example: Titanium-aluminum alloy vacuum melting plus casting slab

[0012] 1. Preparation of electrodes:

[0013] 1) Raw material: Grade 0 titanium sponge (particle size 12.5~25.4mm)

[0014] Aluminum vanadium alloy (58% vanadium content)

[0015] Aluminum beans: (particle diameter less than 10mm)

[0016] The hydraulic press presses the approximate circular electrode block, with a density of more than 3.0 g / cm3. After pressing, use argon shielded plasma welding to weld the electrode block into an electrode to be melted.

[0017] 2. One-time smelting by vacuum self-consumption

[0018] Melting voltage: 25-37 volts

[0019] Current: 40-70 amps / square centimeter

[0020] Melting vacuum degree: 0.4~3 Pascal

[0021] One ingot casting:

[0022] The crucible is made of special metal composite material and is cooled by external water.

[0023] 3. Secondary smelting of vacuum shell

[0024] The primary ingot is melted twice in a 250kg vacuum shell furnace, a...

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Abstract

The invention provides a vacuum melting and slab casting method of a titanium-aluminum alloy, wherein titanium and aluminum metal raw materials are formed into a rectangular slab by a method of multiple vacuum consumable melting and centrifugal casting; the melt is solidified into an ingot in a metal composite material crucible; the crucible is fabricated from a composite material of a special metal and pure copper formed after explosive cladding; the outer layer is cooled by pure copper liquid so that a slow cooling speed is obtained during the melting of the TiAl alloy.

Description

Technical field: [0001] The invention relates to a method for processing a slab of titanium-aluminum alloy Background technique [0002] TiAl intermetallic compound is a new type of light-weight high-temperature structural material. Its volume and mass are less than 50% of that of nickel-based alloys. It has the advantages of light weight, high specific strength, corrosion resistance, corrosion resistance, high temperature resistance and excellent oxidation resistance. And it has excellent mechanical properties at room temperature and high temperature, and the service temperature can reach 700-1000 ° C. It has become a light-weight high-temperature structural material with the broadest application prospects in the contemporary era. It has also become an important material basis for a new generation of weaponry and high-tech products with high performance, low cost, long life and lightweight. Key technologies in the development of vehicle heat-resistant components provide ne...

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Application Information

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IPC IPC(8): C22C1/02C22C14/00B22D13/00B22D7/00B22D27/04
Inventor 邓宁嘉赵瑞晋葛伟徐国俊夏小院孙建王斌
Owner 安徽宝泰特种材料有限公司
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