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Feeding method for improving uniformity of components of head of TC4 cast ingot

A technology of uniformity and ingot casting, which is applied in the field of feeding to improve the uniformity of the composition of the TC4 ingot head, can solve the problem of low Al element in the core, and achieve the effect of uniform distribution of Al element

Inactive Publication Date: 2018-04-13
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a feeding method that can solve the problem of low Al element in the center of the TC4 ingot in the prior art and improve the composition uniformity of the head of the TC4 ingot

Method used

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  • Feeding method for improving uniformity of components of head of TC4 cast ingot
  • Feeding method for improving uniformity of components of head of TC4 cast ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1: Mix the national standard zero-grade or grade-one sponge titanium, pure aluminum, aluminum-vanadium alloy, and titanium dioxide powder according to the mass of Al: 6.0%, V: 3.5%, O: 0.08%, and the balance is Ti to obtain a mixture. ;

[0018] Step 2: Press the mixture into an electrode block, control the pressing pressure at 20Mpa, and keep the pressure for 8 seconds;

[0019] Step 3: Use plasma welding in the furnace to weld several electrode blocks together to obtain consumable electrodes, and avoid oxidation caused during the welding process in a vacuum environment; use copper plasma torch tips to avoid W caused by tungsten torch tip welding Inclusion;

[0020] Step 4: Melt the consumable electrode three times in a vacuum electric arc furnace:

[0021] The first smelting uses a Φ560mm crucible. During the smelting process, the vacuum degree is controlled below 5Pa (Pa), the smelting current is 10-20kA, the smelting voltage is 25-30V, and the cooling time af...

Embodiment 2

[0027] Step 1: Mix the national standard zero-grade or grade-one sponge titanium, pure aluminum, aluminum-vanadium alloy, and titanium dioxide powder according to the mass of Al: 6.4%, V: 4.3%, O: 0.13%, and the balance is Ti to obtain a mixture. ;

[0028] Step 2: Press the mixture into an electrode block, control the pressing pressure at 30Mpa, and keep the pressure for 83 seconds;

[0029] Step 3: Use plasma welding in the furnace to weld several electrode blocks together to obtain consumable electrodes, and avoid oxidation caused during the welding process in a vacuum environment; use copper plasma torch tips to avoid W caused by tungsten torch tip welding Inclusion;

[0030] Step 4: Melt the consumable electrode three times in a vacuum electric arc furnace:

[0031] The first smelting uses a Φ560mm crucible. During the smelting process, the vacuum degree is controlled below 4Pa, the smelting current is 20-30kA, the smelting voltage is 27-35V, and the cooling time after ...

Embodiment 3

[0037] Step 1: Mix the national standard zero-grade or grade-one sponge titanium, pure aluminum, aluminum-vanadium alloy, and titanium dioxide powder according to the mass of Al: 6.2%, V: 4.0%, O: 0.10%, and the balance is Ti to obtain a mixture. ;

[0038] Step 2: Press the mixture into an electrode block, control the pressing pressure at 28Mpa, and keep the pressure for 6 seconds;

[0039] Step 3: Use plasma welding in the furnace to weld several electrode blocks together to obtain consumable electrodes, and avoid oxidation caused during the welding process in a vacuum environment; use copper plasma torch tips to avoid W caused by tungsten torch tip welding Inclusion;

[0040] Step 4: Melt the consumable electrode three times in a vacuum electric arc furnace:

[0041] The first smelting uses a Φ560mm crucible. During the smelting process, the vacuum degree is controlled below 5Pa (Pa), the smelting current is 10-20kA, the smelting voltage is 25-30V, and the cooling time af...

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Abstract

The invention discloses a feeding method for improving the uniformity of components of a head of a TC4 cast ingot. The method comprises the following steps: proportioning sponge titanium and an intermediate alloy according to a proportion required by GB / T3620.1; mixing the materials and pressing the materials into an electrode block; after carrying out vacuum plasma welding on the electrode block,carrying out vacuum arc furnace smelting, wherein in the smelting process, the residual weight and the argon filling pressure of the electrode are strictly controlled in the third time smelting feeding stage; and finally, carrying out surface machining to obtain a finished product cast ingot. The feeding method disclosed by the invention solves the problems that the center Al element of the existing phi720mm specification TC4 cast ingot is relatively low and the phase transformation point of the cast ingot is greatly deviated.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing, and relates to a feeding method for improving the component uniformity of a TC4 ingot head. Background technique [0002] TC4 alloy is an α+β-type titanium alloy with excellent comprehensive properties, high plasticity and impact toughness, and is often used in important parts in aviation, aerospace and other fields. TC4 titanium alloy ingots are generally prepared by vacuum consumable arc melting, and the ingots whose composition and structure meet the requirements are obtained after three times of melting. Since the composition of the ingot has an important influence on the phase transition point, and the TC4 alloy is a hard-to-deform material, its microstructure and properties after forging are sensitive to forging thermal parameters and difficult to control. Therefore, the accuracy of its phase transition point is an important basis for its forging process. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20C22C14/00C22C1/03
CPCC22B9/20C22C1/03C22C14/00
Inventor 赵小花刘鹏樊彦杰罗文忠赖运金王凯旋
Owner 西部超导材料科技股份有限公司
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