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Low-density high-strength niobium alloy bar and preparing method thereof

A niobium alloy, low-density technology, applied in the field of low-density and high-strength niobium alloy bars and their preparation, can solve the problems of high preparation cost, uneven matrix composition, and lack of niobium alloy ingots, etc., and achieves high room temperature and high temperature. Mechanical properties, excellent internal structure, and the effect of eliminating intragranular segregation

Inactive Publication Date: 2019-03-01
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, this kind of niobium alloy is very sensitive to stress during processing due to the large amount of alloying elements and high alloying degree.
In the prior art, most of the high-strength and low-density niobium alloy ingots are prepared by the vacuum consumable arc melting method. Due to the fast cooling rate during vacuum consumable arc melting, the niobium alloy ingots cannot obtain a completely balanced structure. The composition of the matrix is ​​not uniform, resulting in intragranular segregation; in addition, because the raw materials inevitably contain a certain amount of gas impurity elements, if the gas is not completely discharged during smelting, pores will be formed inside the niobium alloy ingot, forming microscopic defects
When the bar is forged, stress concentration is easy to occur around the microscopic defects in the niobium alloy ingot, which is easy to forge and crack, the yield is extremely low, and the preparation cost is very high, which hinders its popularization and application

Method used

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  • Low-density high-strength niobium alloy bar and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] The low-density high-strength niobium alloy bar of this embodiment consists of the following components by mass percentage: Ti 30%, Al 5%, W 4.5%, Cr 6%, Zr 1.1%, Mo 0.5%, Y 0.06%, and the balance is Nb and unavoidable impurities; the density of the low-density high-strength niobium alloy rod is 6.89g / cm 3 , The tensile strength at room temperature is 1170MPa, the elongation at room temperature is 20%, and the tensile strength at 1200°C is 178MPa.

[0031] The preparation method of the low-density high-strength niobium alloy bar of the present embodiment comprises the following steps:

[0032] Step 1. Put 52.3kg of pure niobium shavings, 30kg of zero-grade sponge titanium, 0.88kg of aluminum beans, 6kg of high-purity chromium, 9kg of AlW50, 0.623kg of AlMo80, 0.06kg of yttrium powder, and 1.1kg of nuclear-grade zirconium sponge into the pressing mold and ensure that zero-grade sponge titanium, aluminum beans, high-purity chromium, AlW50, AlMo80, yttrium powder, and nuc...

Embodiment 2

[0039] The low-density high-strength niobium alloy bar of this embodiment consists of the following components by mass percentage: Ti 29.5%, Al 4.5%, W 4%, Cr 5.5%, Zr 1%, Mo 0.4%, Y 0.08%, the balance It is Nb and unavoidable impurities; the density of the low-density high-strength niobium alloy rod is 6.8g / cm 3 , The tensile strength at room temperature is 1150MPa, the elongation at room temperature is 18%, and the tensile strength at 1200°C is 100MPa.

[0040] The preparation method of the low-density high-strength niobium alloy bar of the present embodiment comprises the following steps:

[0041] Step 1. Put 55kg of pure niobium shavings, 29.5kg of zero-grade titanium sponge, 0.4kg of aluminum beans, 5.5kg of high-purity chromium, 8kg of AlW50, 0.5kg of AlMo80, 0.08kg of yttrium powder, and 1kg of nuclear-grade zirconium sponge into the pressing mold and ensure that zero-grade sponge titanium, aluminum beans, high-purity chromium, AlW50, AlMo80, yttrium powder, and nuclea...

Embodiment 3

[0047] The low-density high-strength niobium alloy bar of this embodiment consists of the following components by mass percentage: Ti 30.5%, Al 5.5%, W 5%, Cr 7.5%, Zr 1.3%, Mo 0.7%, Y 0.05%, the balance It is Nb and unavoidable impurities; the density of the low-density high-strength niobium alloy rod is 7g / cm 3 , The tensile strength at room temperature is 1200MPa, the elongation at room temperature is 16%, and the tensile strength at 1200°C is 180MPa.

[0048] The preparation method of the low-density high-strength niobium alloy bar of the present embodiment comprises the following steps:

[0049] Step 1. Put 49.5kg of pure niobium shavings, 30.5kg of zero-grade sponge titanium, 0.33kg of aluminum beans, 7.5kg of high-purity chromium, 10kg of AlW50, 0.87kg of AlMo80, 0.05kg of yttrium powder, and 1.3kg of nuclear-grade zirconium sponge into the In the pressing mold, and ensure that zero-grade sponge titanium, aluminum beans, high-purity chromium, AlW50, AlMo80, yttrium pow...

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Abstract

The invention discloses a low-density high-strength niobium alloy bar. The low-density high-strength niobium alloy bar is formed by Ti, Al, W, Cr, Zr, Mo, Y and Nb, the density of the niobium alloy bar is 6.5-7.0 g / cm 3 , and the tensile strength at room temperature is 900-1200 MPa. The invention further discloses a preparing method of the low-density high-strength niobium alloy bar. The preparingmethod comprises the steps of 1, pressing, installing and welding consumable electrodes; 2, conducting vacuum consumable smelting to obtain niobium alloy ingots; 3, conducting hot isostatic pressingtreatment; 4, conducting extruding to obtain a niobium alloy bar blank; 5, conducting heating and calcining and obtaining the niobium alloy bar. The niobium alloy bar contains low-melting-point metaland high-meting-point metal separately, and thus the low density and the high density are guaranteed; according to the preparing method, the hot isostatic pressing treatment is adopted to overcome thedefects of micro-segregation, gas holes and the like of the interiors of the niobium alloy ingots, fracture of the low-density high-strength niobium alloy bar is avoided, and the yield of the low-density high-strength niobium alloy bar is increased.

Description

technical field [0001] The invention belongs to the technical field of alloy rods, and in particular relates to a low-density, high-strength 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 for the performance of materials. For example, projects such as moon landing projects and large helicopters require that structural materials not only have high high-temperature strength but also excellent reliability under operating temperatures. Processing performance, 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. In order to avoid the above-mentioned defect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C1/03C22F1/18
CPCC22C1/03C22C27/02C22F1/18
Inventor 蔡小梅郑欣白润王峰夏明星刘辉薛建嵘王晖
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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