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Smelting method for titanium-niobium alloy ingot

A titanium-niobium alloy and ingot casting technology, which is applied in the field of titanium alloy preparation, can solve problems such as niobium scraps easily sinking into the bottom of the molten pool, poor chemical composition uniformity of ingots, niobium inclusions, etc., to avoid niobium inclusions, simplify the process, The effect of uniform chemical composition

Active Publication Date: 2015-01-28
西安超晶科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The melting point of niobium is about 800°C higher than that of titanium. During the smelting process of the consumable electrode prepared by the above method, due to the different melting speeds of various parts, it is easy to cause poor uniformity of the chemical composition of the ingot.
In addition, since the density of niobium is about twice that of titanium, incompletely melted niobium scraps tend to sink to the bottom of the molten pool during the smelting process, resulting in niobium inclusions.

Method used

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  • Smelting method for titanium-niobium alloy ingot
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  • Smelting method for titanium-niobium alloy ingot

Examples

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Embodiment 1

[0035] see figure 1 , In this embodiment, a titanium-niobium alloy ingot with a niobium content of 46.8%wt and a diameter of Φ280mm is taken as an example.

[0036] Step 1: Calculated based on the Φ160mm diameter crucible used for one smelting, 13 titanium rods with specifications of Φ22×2000mm and 6 niobium rods are required, with a total weight of about 83.5kg.

[0037] Step 2: The titanium rods and niobium rods taken in step 1 are figure 1 The arrangement shown is tailor-welded into consumable electrodes by plasma arc welding.

[0038] Step 3: The consumable electrode prepared in step 2 was melted in a vacuum consumable electric arc furnace to obtain a Φ160mm titanium-niobium alloy primary ingot; the melting current was 6KA, and the melting voltage was 27V.

[0039] Step 4: Two primary ingots are welded upside down and used as consumable electrodes for secondary melting in a vacuum consumable electric arc furnace to obtain secondary ingots; the diameter of the crucible is...

Embodiment 2

[0046] In this embodiment, a titanium-niobium alloy ingot with a niobium content of 46.8%wt and a diameter of Φ360mm is taken as an example.

[0047] Step 1: Calculated based on the Φ220mm diameter crucible used for one smelting, 13 titanium rods with specifications of Φ32×2000mm and 6 niobium rods are required, with a total weight of about 176.5kg.

[0048] Step 2: The titanium rods and niobium rods taken in step 1 are figure 1 The arrangement shown is tailor-welded into consumable electrodes by plasma arc welding.

[0049] Step 3: The consumable electrode prepared in step 2 was melted in a vacuum consumable electric arc furnace to obtain a Φ220mm titanium-niobium alloy primary ingot; the melting current was 10KA, and the melting voltage was 30V.

[0050] Step 4: Two Φ220mm primary ingots are welded upside down and used as consumable electrodes for secondary melting in a vacuum consumable electric arc furnace to obtain secondary ingots; the diameter of the crucible is Φ280mm...

Embodiment 3

[0057] In this embodiment, a titanium-niobium alloy ingot with a niobium content of 50.8%wt and a diameter of Φ280 mm is taken as an example.

[0058] Step 1: Calculated based on the Φ160mm diameter crucible used for one smelting, the required specifications are 1 Φ24×2000mm titanium rod, 6 Φ24×2000mm niobium rods, 12 Φ22×2000mm titanium rods, with a total weight of about 84.5kg.

[0059] Step 2: The titanium rods and niobium rods taken in step 1 are figure 1 The arrangement shown is tailor-welded into consumable electrodes by plasma arc welding.

[0060] Step 3: Melting the consumable electrode prepared in step 2 in a vacuum consumable electric arc furnace to obtain a Φ160mm titanium-niobium alloy primary ingot; the melting current is 8KA, and the melting voltage is 29V.

[0061] Step 4: Weld two primary ingots upside down and use them as consumable electrodes for secondary melting in a vacuum consumable electric arc furnace to obtain secondary ingots; the diameter of the cr...

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Abstract

The invention relates to a smelting method for a titanium-niobium alloy ingot. The alloy ingot comprises 46.8-55% by weight of niobium and the balance of titanium. The smelting method comprises the following steps: tailor-welding a plurality of titanium rods and niobium rods into a consumable electrode, wherein a ring of niobium rods is uniformly distributed around one titanium rod and a ring of titanium rods is further uniformly distributed around one niobium rod, and the niobium rods and the titanium rods are arranged in parallel; smelting the consumable electrode in a vacuum consumable electro-arc furnace to obtain a primary ingot, wherein the smelting current is 6-10KA and the smelting voltage is 27-30V; and then, smelting again to obtain the titanium-niobium alloy ingot. The titanium-niobium alloy ingot prepared by the method provided by the invention is uniform and stable in chemical components and the deviation of the chemical components is less than 0.2%. The ingot is segregation-free and high in density with metallurgical defects. The ingot provided by the invention is suitable for producing the titanium-niobium alloy ingot with high metallurgical quality.

Description

technical field [0001] The invention belongs to the field of titanium alloy preparation, and in particular relates to a method for smelting titanium-niobium alloy ingots. Background technique [0002] There are more and more applications of titanium alloys and composite materials in the aerospace field, and more and more applications of titanium alloy fasteners as composite material connectors. In recent years, titanium alloy fasteners have successfully replaced some Low steel fasteners for very good weight reduction. The annealed titanium-niobium alloy is very suitable as a rivet material because its shear strength and tensile strength are higher than pure titanium, but its deformation resistance is lower than that of pure titanium. [0003] At present, the preparation of titanium-niobium alloy ingots is mainly realized by 2 to 3 times of vacuum consumable arc melting. The cloth is pressed into an electrode block, and then the electrode block is assembled and welded into ...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C14/00C22C27/02
Inventor 焦勇张利军刘娣刘小花薛祥义
Owner 西安超晶科技股份有限公司
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