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Smelting method for manufacturing large-sized titanium-aluminum alloy ingot

A titanium-aluminum alloy, large-size technology, applied in the smelting field of preparing titanium-aluminum alloy ingots, can solve the problems of small size of smelted ingots, composition segregation, uncontrollable machining, etc., and achieve the effect of complete appearance and uniform structure

Inactive Publication Date: 2014-02-05
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of small size of smelted ingot, composition segregation and uncontrollable subsequent mechanical processing existing in smelting titanium-aluminum-based ingots in the prior art, and to provide a smelting method for preparing large-sized titanium-aluminum alloy ingots

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  • Smelting method for manufacturing large-sized titanium-aluminum alloy ingot
  • Smelting method for manufacturing large-sized titanium-aluminum alloy ingot

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specific Embodiment approach 1

[0021] Specific Embodiment 1: This embodiment is a smelting method for preparing a large-size titanium-aluminum alloy ingot, which is specifically completed according to the following steps:

[0022] 1. Preparation of consumable electrodes:

[0023] ① According to the nominal chemical composition Ti-xAl-yM, weigh grade 0 sponge titanium with a material particle size of 12.5 mm to 25.4 mm, aluminum beans with a particle diameter of 2 mm to 10 mm, and intermediate alloy particles with a particle diameter of 0.25 mm to 10 mm; In the Ti-xAl-yM, 43≤x≤45, 5≤y≤9, M is V or Nb; the intermediate alloy particles are aluminum-vanadium alloys with a mass fraction of vanadium of 58% or a mass fraction of niobium of 50% % aluminum-niobium alloy;

[0024] ②Mix the grade 0 sponge titanium, aluminum beans and intermediate alloy particles weighed in step 1 ①, put the mixed pellets into the pressing mold, and press the oil to make the density 2.8g / cm 3 ~3.5g / cm 3 electrode block;

[0025] ③U...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the oil pressing described in step 1.2 has a density of 2.9g / cm 3 ~3.4g / cm 3 electrode block. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 2, the melting voltage of the electrode to be melted obtained in step ③ is 27V-35V, and the melting current density is 45A / cm 2 ~65A / cm 2 The smelting is carried out under the condition that the smelting vacuum degree is 0.4Pa-2.5Pa to obtain a primary ingot. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a smelting method for manufacturing a large-sized titanium-aluminum alloy ingot, which relates to a smelting method for manufacturing the titanium-aluminum alloy ingot, and aims at solving the problems that a titanium-aluminum ingot smelted by the prior art is small in size, and the composition segregation and subsequent machining are uncontrollable. The smelting method comprises the following steps of A, preparing a self-consumed electrode; B, carrying out vacuum self-consumed primary smelting; C, carrying out vacuum kish secondary smelting; and D, carrying out vacuum self-consumed tertiary smelting. The method has the advantages that a, the large-sized titanium-aluminum alloy ingot with the diameter of 300mm to 400mm can be smelted; B, the manufactured titanium-aluminum alloy ingot is uniform in tissue, no impurity is contained in air holes, and no infusible block exists. By adopting the smelting method, the large-sized ingot with the diameter of 300mm to 400mm and with complete appearance, no obvious crack and no impurity in air holes can be obtained.

Description

technical field [0001] The invention relates to a melting method for preparing titanium-aluminum alloy ingots. Background technique [0002] TiAl intermetallic compound is a new type of lightweight high-temperature structural material. Its mass is less than 50% of that of nickel-based alloys at the same volume. It has light weight, high specific strength, corrosion resistance, high temperature resistance and excellent oxidation resistance. It is used in It has excellent mechanical properties at room temperature and high temperature. The service temperature can reach 700 ° C ~ 1000 ° C, becoming a light-weight high-temperature structural material with the broadest application prospects in the contemporary era. As an important material basis for a new generation of weaponry and high-tech products, it has high performance, low cost, and long life. and lightweight advantages. TiAl intermetallic compounds will provide new technical guidance for key technologies in the developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20C22C1/03C22C14/00
Inventor 陈玉勇孔凡涛肖树龙邓宁嘉葛伟赵瑞晋
Owner HARBIN INST OF TECH
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