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Manufacturing method for niobium-containing Ti3Al alloy cast ingot

An alloy ingot and ingot casting technology is applied in the field of preparation of niobium-containing Ti3Al alloy ingots, which can solve the problem that the accuracy and uniformity of alloy composition cannot be guaranteed, the niobium-containing Ti3Al alloy has serious segregation of niobium elements, melting point, density and vapor The pressure difference is relatively large and other problems, so as to avoid uneven chemical composition, uniform composition, and reduce the melting point difference.

Active Publication Date: 2016-11-23
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The melting point, density and vapor pressure of various elements of niobium-containing Ti3Al alloy are quite different, which brings difficulties to the preparation of the alloy. The niobium-containing Ti3Al alloy prepared by the traditional process has serious segregation of niobium elements, and the accuracy and uniformity of the alloy composition hard to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Taking the preparation of 120kg Ti-22at.%Al-25at.%Nb alloy ingot as an example, the preparation steps are as follows:

[0033] Step 1: Use sponge titanium above grade 0 as the raw material to prepare a pure titanium ingot, and the pure titanium ingot is prepared by forging, rolling, grinding and other processes to prepare a bright titanium rod with a specification of Φ28mm.

[0034] Step 2: Calculated to prepare 120kg Ti-22at.%Al-25at.%Nb alloy ingot requires 1 Φ62×2000mm niobium rod, 10 Φ28×2000mm titanium rods, 10 Φ19.5×2000mm aluminum rods, self-consumption The arrangement of titanium rods, niobium rods and aluminum rods during electrode tailoring is as follows: 1 niobium rod in the center, 10 titanium rods are closely arranged around the niobium rod in the second layer, and 10 aluminum rods are evenly arranged around the niobium rod in the third layer. . Wherein, the proportion of aluminum rods is 20% higher than the actual mass percentage of aluminum in the Ti-22a...

Embodiment 2

[0044] Taking the preparation of 80kg Ti-25at.%Al-16at.%Nb alloy ingot as an example, the preparation steps are as follows:

[0045] Step 1: Use sponge titanium above grade 0 as the raw material to prepare a pure titanium ingot, and the pure titanium ingot is prepared by forging, rolling, grinding and other processes to prepare a bright titanium rod with a specification of Φ30mm.

[0046] Step 2: Calculated to prepare 80kg Ti-25at.%Al-16at.%Nb alloy ingot requires 1 Φ42.5×2000mm niobium rod, 7 Φ30×2000mm titanium rods, 7 Φ21.5×2000mm aluminum rods, The arrangement of titanium rods, niobium rods and aluminum rods during tailor welding of consumable electrodes is as follows: 1 niobium rod in the center, 7 titanium rods are closely arranged around the niobium rod in the second layer, and 7 titanium rods are evenly arranged around the niobium rod in the third layer. aluminum rod

[0047] Step 3: Use the plasma arc welding method to tailor the titanium rod, the aluminum rod and th...

Embodiment 3

[0056] Taking the preparation of 124kg Ti-22at.%Al-27at.%Nb alloy ingot as an example, the preparation steps are as follows:

[0057] Step 1: Use sponge titanium above grade 0 as the raw material to prepare a pure titanium ingot, and the pure titanium ingot is prepared by forging, rolling, grinding and other processes to prepare a bright titanium rod with a specification of Φ27.5mm.

[0058] Step 2: Calculated to prepare 124kg Ti-22at.%Al-27at.%Nb alloy ingot requires 1 Φ65×2000mm niobium rod, 10 Φ27.5×2000mm titanium rods, 10 Φ19.5×2000mm aluminum rods, The arrangement of titanium rods, niobium rods and aluminum rods during tailor welding of consumable electrodes is as follows: 1 niobium rod in the center, 10 titanium rods are closely arranged around the niobium rod in the second layer, and 10 aluminum rods are evenly arranged in the third layer.

[0059] Step 3: Use the plasma arc welding method to tailor the titanium rod, the aluminum rod and the niobium rod to form a consu...

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PUM

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Abstract

The invention discloses a manufacturing method for a niobium-containing Ti3Al alloy cast ingot. A pure titanium cast ingot is manufactured firstly, then the pure titanium cast ingot is machined into a shining titanium bar, the obtained shining titanium bar, a shining niobium bar and a shining aluminum bar are welded into a consumable electrode in a spliced mode, the consumable electrode is subjected to three times of vacuum self-consuming electric arc melting, and the niobium-containing Ti3Al alloy cast ingot is obtained. The consumable electrode is manufactured in the bar splice welding mode, and manufacturing of intermediate alloy and the step of electrode block pressing are omitted, so that the process is simplified. Meanwhile, due to the fact that the consumable electrode is manufactured by welding the titanium bar, the aluminum bar and the niobium bar in a splicing mode, the effect that the contents of all elements on the same melting cross section in the melting process are consistent can be ensured; and due to the fact that the titanium bar, the aluminum bar and the niobium bar are all compact materials, the defects of nonuniform chemical components caused by different local melting speeds or impurity inclusion caused by block falling and the like are avoided. The alloy cast ingot manufactured through the method is uniform in component, and the defects that in the prior art, the niobium element is segregated severely, alloy components are inaccurate and the uniformity is poor are overcome.

Description

technical field [0001] The invention belongs to the field of titanium alloy preparation, and relates to a preparation method of a niobium-containing Ti3Al alloy ingot. Background technique [0002] Ti3Al is a kind of Ti-Al-based intermetallic compound. It has an ordered close-packed hexagonal structure and high specific strength, but its high temperature strength and room temperature plasticity are low, which limits its development and application. It can be improved by adding β-stabilizing element Nb. Its high temperature oxidation resistance and room temperature plasticity. Niobium-containing Ti3Al-based alloys have many excellent properties. Compared with ordinary titanium alloys, they have better high-temperature performance, oxidation resistance, creep resistance, and higher service temperature; compared with nickel-based alloys, they have lower density and It is about half of that of nickel-based alloys, which is beneficial to the weight reduction of equipment; compar...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C14/00
CPCC22C1/02C22C14/00
Inventor 薛祥义焦勇张利军刘娣刘小花
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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