Method for improving room-temperature fracture toughness of Nb-Si-based multi-element alloy

A fracture toughness and alloy technology, applied in the field of ultra-high temperature structural materials, can solve problems such as poor fracture toughness, and achieve the effects of high density, improved fracture toughness at room temperature, and bright and clean powder surface.

Active Publication Date: 2016-08-03
BEIHANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of poor room-temperature fracture toughness of as-cast Nb-Si-based multi-component alloys, and provides a method for improving room-temperature fracture toughness of Nb-Si-based multi-component alloys on the premise of taking into account the high-temperature strength

Method used

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  • Method for improving room-temperature fracture toughness of Nb-Si-based multi-element alloy
  • Method for improving room-temperature fracture toughness of Nb-Si-based multi-element alloy
  • Method for improving room-temperature fracture toughness of Nb-Si-based multi-element alloy

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Embodiment 1

[0033] Using the combination of plasma rotating electrode atomization technology and spark plasma sintering technology to improve room temperature fracture toughness of Nb-Si based multi-component alloys, the steps are as follows:

[0034] 1. Using Nb, Si, Ti, Cr, Al as synthetic raw materials, using vacuum non-consumable arc melting technology and induction melting casting technology to obtain Nb-22Si-24Ti-2Cr-2Al alloy rods, the size is Φ75mm×150mm, the surface is ground light, dry after washing;

[0035] 2. Fix the Nb-22Si-24Ti-2Cr-2Al alloy rod in the sample loading room of the plasma rotary electrode atomization equipment, and fill the sealing device with high-purity argon (99.99%) for atmosphere protection after vacuumizing;

[0036]3. Set the process parameters such as plasma gun power, plasma arc current and electrode rod speed, so that the end of the high-speed rotating Nb-22Si-24Ti-2Cr-2Al alloy rod is melted, and the melted body is atomized into liquid droplets unde...

Embodiment 2

[0043] Using the plasma rotating electrode atomization method + spark plasma sintering method to improve the room temperature fracture toughness of Nb-Si based multi-component alloys, the steps are as follows:

[0044] 1. Using Nb, Si, Ti, Cr, and Al as synthetic raw materials, the Nb-18Si-24Ti-2Cr-2Al alloy rod is obtained by using vacuum non-consumable arc melting technology and induction melting casting technology, and the sample size is Φ75mm×150mm;

[0045] 2. Fix the Nb-18Si-24Ti-2Cr-2Al alloy sample in the sample loading room of the plasma rotating electrode equipment, and fill the sealing device with high-purity argon (99.99%) for atmosphere protection after vacuumizing;

[0046] 3. Set the process parameters such as plasma gun power, plasma arc current and electrode rod speed, so that the end of the high-speed rotating Nb-18Si-24Ti-2Cr-2Al alloy rod is melted, and the melted body is atomized into liquid droplets under the action of centrifugal force. Shot out, while r...

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Abstract

The invention discloses a method for improving room-temperature fracture toughness of an Nb-Si-based multi-element alloy, and belongs to the field of super-high-temperature structural materials. Nb-Si-based multi-element alloy powder with a micro-submicron-grade phase dimension is prepared under a vacuum condition by applying a plasma rotation electrode atomizing method, taking a Nb-Si-based multi-element alloy rod as a rotation electrode, taking a plasma beam as a heating source and reasonably setting the rotation speed and plasma beam power parameters. By taking the powder as a raw material, an Nb-Si-based multi-element alloy ingot with a uniform and compact structure is prepared by sintering through a discharge plasma technology; and a microscopic structure is composed of a micro-submicron-grade NbSS solid solution and an Nb5Si3 strengthening phase. According to the method, a Nb-Si-based multi-element alloy structure is refined by combining a plasma rotation electrode atomizing technology with a discharge plasma sintering technology, so that the room-temperature fracture type of the NbSS solid solution phase in the Nb-Si-based multi-element alloy is converted into ductile dimple type fracture from cleavage type fracture under a conventional coagulation condition, and therefore, the room-temperature fracture toughness of the Nb-Si-based multi-element alloy is greatly improved. The preparation method for the refined Nb-Si-based multi-element alloy structure is relatively high in practicability.

Description

technical field [0001] The invention discloses a method for improving room-temperature fracture toughness of Nb-Si-based multi-element alloys, which belongs to the field of ultra-high-temperature structural materials, and particularly relates to improving room-temperature fracture of Nb-Si-based multi-element alloys by combining plasma rotating electrode atomization technology and discharge plasma sintering technology toughness. Background technique [0002] With the continuous development of modern aerospace technology, higher requirements are put forward for the temperature before the turbine and the thrust-to-weight ratio of advanced gas turbine engines. High-thrust-to-weight ratio engines require the temperature bearing capacity of the blade material itself to reach 1200-1400°C. At present, the most advanced blade material, the third-generation nickel-based single crystal alloy, has a temperature bearing capacity of about 1150°C and has reached 85% of its melting point, ...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C1/04B22F9/10
CPCB22F9/082B22F9/10B22F2009/0848B22F2998/10C22C1/045C22C27/02B22F3/105
Inventor 沙江波费腾张虎郭跃岭
Owner BEIHANG UNIV
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