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Preparation method of low-density Nb-Ti-Al-V-Zr-C niobium alloy bar

A nb-ti-al-v-zr-c, niobium alloy technology, applied in the field of preparation of low-density Nb-Ti-Al-V-Zr-C niobium alloy rods, can solve the problem of low-density niobium alloy rods Brittle fracture and insufficient elongation, etc., to achieve the effect of excellent microstructure, improved elongation, and increased single deformation

Active Publication Date: 2022-08-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the process of "twice extrusion + quenching + forging" to prepare low-density niobium alloy rods. After the second extrusion, quenching treatment is carried out, so that the carbide reinforcement phase TiC is re-dissolved and dispersed again, To achieve the purpose of effectively controlling the particle size and dispersion of the second phase of TiC, the elongation of low-density niobium alloy rods after fracture is improved, and the problems of brittle fracture and insufficient elongation of low-density niobium alloy rods are solved

Method used

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  • Preparation method of low-density Nb-Ti-Al-V-Zr-C niobium alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of this embodiment comprises the following steps:

[0030] Step 1. The surface of the low-density Nb-30Ti-6Al-9V-1Zr-0.07C niobium alloy ingot with a specification (diameter×length) of Φ260mm×600mm is turned clean, until there are no visible pits, impurities and micro-cracks. , and then apply a high-temperature anti-oxidation coating on the surface of the ingot and air-dry it naturally, put it into a box-type resistance furnace for heating, heat it up to 1300 ℃ with the furnace, and then keep it for 2 hours, and then quickly put it into the extruder for one extrusion, one time The diameter of the extrusion cylinder used for extrusion is Φ280mm, and the extrusion ratio is 4.5. After taking it out, it is cooled to room temperature in the air to obtain a primary extrusion rod with a specification (diameter×length) of Φ130mm×2400mm;

[0031] The low-density Nb-30Ti-6Al-9V-1Zr-0.07C niobium alloy ingot is prepared by a vacuum arc melting method, and th...

Embodiment 2

[0047] The preparation method of this embodiment comprises the following steps:

[0048] Step 1. Turn the surface of the low-density Nb-30Ti-7Al-8V-1Zr-0.07C niobium alloy ingot with a specification (diameter×length) of Φ260mm×600mm to clean, until there are no visible pits, impurities and micro-cracks. , and then apply a high-temperature anti-oxidation coating on the surface of the ingot and air-dry it naturally, put it into a box-type resistance furnace for heating, heat it up to 1300 ℃ with the furnace, and then keep it for 2 hours, and then quickly put it into the extruder for one extrusion, one time The diameter of the extrusion cylinder used for extrusion is Φ280mm, and the extrusion ratio is 4.0. After taking it out, it is cooled to room temperature in the air to obtain a primary extrusion rod with a specification (diameter×length) of Φ140mm×2070mm;

[0049] The low-density Nb-30Ti-7Al-8V-1Zr-0.07C niobium alloy ingot is prepared by a vacuum arc melting method, and the ...

Embodiment 3

[0056] The preparation method of this embodiment comprises the following steps:

[0057] Step 1. Clean the surface of the low-density Nb-28Ti-9Al-6V-1Zr-0.07C niobium alloy ingot with a specification (diameter×length) of Φ260mm×600mm, until there are no pits, impurities and micro-cracks visible to the naked eye. , and then apply a high-temperature anti-oxidation coating on the surface of the ingot and air-dry it naturally, put it into a box-type resistance furnace for heating, heat it up to 1300 ℃ with the furnace, and then keep it for 2 hours, and then quickly put it into the extruder for one extrusion, one time The diameter of the extrusion cylinder used for extrusion is Φ280mm, and the extrusion ratio is 5.0. After taking it out, it is cooled to room temperature in the air to obtain a primary extrusion rod with a specification (diameter×length) of Φ125mm×3000mm;

[0058] The low-density Nb-28Ti-9Al-6V-1Zr-0.07C niobium alloy ingot is prepared by a vacuum arc melting method,...

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Abstract

The invention discloses a preparation method of a low-density Nb-Ti-Al-V-Zr-C niobium alloy bar. The method comprises the following steps: 1, carrying out primary extrusion on a low-density Nb-Ti-Al-V-Zr-C niobium alloy ingot to obtain a primary extruded bar; 2, performing secondary extrusion to obtain a secondary extrusion rod; 3, quenching treatment; 4, free forging processing; and fifthly, vacuum annealing is conducted, and the low-density Nb-Ti-Al-V-Zr-C niobium alloy bar is obtained. According to the method, the low-density niobium alloy bar is prepared through the technology of two-time extrusion, quenching and forging, the quenching treatment technology and the secondary extrusion technology are added, the carbide reinforced phase TiC is separated out and nucleated again after redissolution and is dispersed and distributed in a matrix, the size of the carbide reinforced phase is effectively reduced, and the dispersity of the carbide reinforced phase is improved; the elongation after fracture of the low-density niobium alloy bar is improved, so that the low-density niobium alloy bar shows room-temperature high-strength and high-plasticity mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of refractory metals, and in particular relates to a preparation method of a low-density Nb-Ti-Al-V-Zr-C niobium alloy rod. Background technique [0002] In the aerospace field, the new Nb-Ti-Al alloy has a low density of 6.0g / cm 3 ~7.0g / cm 3 , high specific strength, good high temperature oxidation resistance and other advantages have become important structural materials. The niobium alloy can be used in military aircraft hot oil pipelines, as well as in the diffusion section of rocket engines and structural parts for interstellar transportation. Decreasing alloy density can reduce structural mass, increase payload, and reduce fuel consumption. The tensile strength of the alloy bar at room temperature is about 900MPa-1000MPa, the elongation after breaking is 10%-25%, and the high-temperature tensile strength at 1100℃ is about 80MPa-90MPa, which can be used for heat-resistant parts at 1000℃~1200℃. Nicke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C27/02C22C1/02B21J5/08B21J5/06B21C23/00
CPCC22F1/18C22C27/02C22C1/02B21J5/08B21C23/001B21J5/06Y02E30/30
Inventor 王峰白润蔡小梅夏明星刘辉王晖白伟
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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