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A kind of high-strength low-density niobium alloy bar and its preparation method

A niobium alloy and low-density technology, which is applied in the field of high-strength and low-density niobium alloy rods and their preparation, can solve the problems of uneven matrix composition, hindering popularization and application, and easy forging and cracking, and achieve excellent room temperature and high temperature comprehensive performance, excellent Room temperature and high temperature performance, the effect of excellent internal structure

Active Publication Date: 2018-09-28
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large amount of alloying elements and high degree of alloying, this kind of niobium alloy is very sensitive to stress during processing, especially when the bar is forged, due to the influence of tensile stress on the surface of the material, it is very easy to forge and crack, which hinders its Promote application
Moreover, when the ingot is prepared by vacuum arc melting at present, due to the fast cooling rate during smelting, the ingot cannot obtain a completely balanced structure, and the matrix composition will be uneven during the solidification process, resulting in intragranular segregation; Avoid containing a certain amount of gas impurity elements, if the gas is not completely discharged during smelting, pores will be formed inside the ingot
When the bar is forged, stress concentration tends to occur around these microscopic defects, and this kind of niobium alloy has low plasticity, is not easy to deform, and the bar is very easy to forge and crack, so the yield is extremely low and the preparation cost is high, which hinders its development. Promote application

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  • A kind of high-strength low-density niobium alloy bar and its preparation method

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Embodiment 1

[0027] The high-strength and low-density niobium alloy material of this embodiment consists of the following components by weight percentage: Ti 30%, Al 5%, W 4.5%, Cr 4%, Zr 1.1%, Mo 0.5%, and the balance is Nb and unavoidable Impurities.

[0028] The preparation method of the high-strength low-density niobium alloy bar of the present embodiment comprises the following steps:

[0029] Step 1. Put zero-grade sponge titanium, aluminum beans, high-purity chromium, AlW50, AlMo80, nuclear-grade sponge zirconium and Nb1 into the pressing mold, and ensure zero-grade sponge titanium, aluminum beans, high-purity chromium, aluminum-tungsten alloy, Aluminum-molybdenum alloy and nuclear-grade sponge zirconium are evenly distributed along the length direction of the die, and then pressed into electrode blocks, and the pressed electrode blocks are welded into consumable electrodes by argon arc welding; the quality and purity of the aluminum beans Not less than 99.9%; the mass purity of th...

Embodiment 2

[0036] The high-strength and low-density niobium alloy material of this embodiment consists of the following components by weight percentage: Ti 29.5%, Al 4.5%, W 4%, Cr 3.5%, Zr 1%, Mo 0.4%, and the balance is Nb and unavoidable of impurities.

[0037] The preparation method of the high-strength low-density niobium alloy bar of the present embodiment comprises the following steps:

[0038]Step 1. Put zero-grade sponge titanium, aluminum beans, high-purity chromium, AlW50, AlMo80, nuclear-grade sponge zirconium and Nb1 into the pressing mold, and ensure zero-grade sponge titanium, aluminum beans, high-purity chromium, aluminum-tungsten alloy, Aluminum-molybdenum alloy and nuclear-grade sponge zirconium are evenly distributed along the length direction of the die, and then pressed into electrode blocks, and the pressed electrode blocks are welded into consumable electrodes by argon arc welding; the quality and purity of the aluminum beans Not less than 99.9%; the mass purity o...

Embodiment 3

[0044] The high-strength and low-density niobium alloy material of this embodiment consists of the following components by weight percentage: Ti 30.5%, Al 5.5%, W 5%, Cr 4.5%, Zr 1.3%, Mo 0.7%, and the balance is Nb and unavoidable of impurities.

[0045] The preparation method of the high-strength low-density niobium alloy bar of the present embodiment comprises the following steps:

[0046] Step 1. Put zero-grade sponge titanium, aluminum beans, high-purity chromium, AlW50, AlMo80, nuclear-grade sponge zirconium and Nb1 into the pressing mold, and ensure zero-grade sponge titanium, aluminum beans, high-purity chromium, aluminum-tungsten alloy, Aluminum-molybdenum alloy and nuclear-grade sponge zirconium are evenly distributed along the length direction of the die, and then pressed into electrode blocks, and the pressed electrode blocks are welded into consumable electrodes by argon arc welding; the quality and purity of the aluminum beans Not less than 99.9%; the mass purit...

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Abstract

The invention provides a high-strength and low-density niobium alloy bar consisting of the following ingredients by the weight percentage: 29%-31% of Ti, 4%-6% of Al, 4%-5% of W, 3%-5% of Cr, 0.8%-1.8% of Zr, 0.3%-1% of Mo, and the balance Nb and unavoidable impurities. The invention also provides a preparation method of the niobium alloy bar, wherein the preparation method comprises the following steps: one, pressing to prepare electrodes, welding the pressed electrode block group into a self-consumable electrode by using argon arc welding; two, preparing a cast ingot; three, carrying out hot isostatic pressing treatment of the cast ingot; four, extruding into a bar blank; and five, forging to obtain the high-strength and low-density niobium alloy bar. The prepared alloy bar has the advantages of uniform structure, fine grains and good surface quality, and at the same time, the internal ingredients of the alloy bar almost have no segregation, so based on ensuring that the bar has relatively high mechanical properties, the production cost can be effectively reduced by using the preparation method.

Description

technical field [0001] The invention belongs to the technical field of alloy rods, and in particular relates to a high-strength and low-density niobium alloy rod and a preparation method thereof. Background technique [0002] The rapid development of my country's aerospace and space technology has put forward higher and higher requirements on the performance of materials. For example, my country's moon landing projects, large helicopters and other projects require that structural materials not only have high high-temperature strength, but also excellent Machinability, and the specific weight of the material is light. [0003] Among the materials for high-temperature structural parts, high-temperature titanium alloys have low high-temperature strength, C / C composite materials have poor machinability, and conventional niobium alloy materials such as C103 and Nb521 have high density and high price. High-strength and low-density niobium-based alloys avoid the above-mentioned def...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22F1/18
CPCC22C27/02C22F1/18
Inventor 蔡小梅郑欣白润王峰夏明星刘辉李来平王晖
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH