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A Method for Improving the Oxidation Resistance of nb-Si-Based Alloys Using Electron Beam Remelting Technology

A technology of electron beam remelting and oxidation resistance, which is applied in the field of improving the oxidation resistance of Nb-Si-based alloys by using electron beam surface remelting technology, can solve the problems of insufficient high-temperature oxidation performance of Nb-Si-based alloys, and achieve improved high-temperature Oxidation resistance, effect of improving high temperature oxidation resistance

Inactive Publication Date: 2018-03-16
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is aimed at the problem of insufficient high-temperature oxidation performance of Nb-Si-based alloys, and provides a method for effectively improving the high-temperature oxidation resistance of Nb-Si-based alloys
At the same time, the surface remelted layer and the base alloy are combined in a metallurgical manner, so there is no problem of failure caused by a large difference in thermal expansion coefficient

Method used

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  • A Method for Improving the Oxidation Resistance of nb-Si-Based Alloys Using Electron Beam Remelting Technology
  • A Method for Improving the Oxidation Resistance of nb-Si-Based Alloys Using Electron Beam Remelting Technology
  • A Method for Improving the Oxidation Resistance of nb-Si-Based Alloys Using Electron Beam Remelting Technology

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Experimental program
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Effect test

Embodiment 1

[0031] 1. Using high-purity Nb and Si as synthetic raw materials, the Nb-20Si alloy master ingot was obtained by arc melting technology, and a circular substrate with a diameter of 60mm and a thickness of 15mm was cut by wire cutting, and the surface of the sample was polished, cleaned and dried spare;

[0032] 2. Fix the Nb-20Si alloy substrate on the workbench, and pump the sealed forming cavity into a high vacuum state;

[0033] 3. Preheat the Nb-20Si alloy substrate with a high-energy electron beam. The preheating temperature is 900°C. The specific preheating parameters are: accelerating voltage 30kV, current 9.0mA, and electron beam focal spot size 100μm;

[0034] 4. After the preheating is over, set the corresponding processing parameters, scan the surface of the Nb-20Si alloy substrate with an electron beam, the surface of the sample is melted and solidified, and a remelting layer is formed. The specific remelting parameters: accelerating voltage 30kV, scanning current ...

Embodiment 2

[0037]1. Using high-purity Nb, Si, Ti, Cr, and Al as synthetic raw materials, four kinds of Nb-Si-based alloy master ingots were obtained by vacuum induction melting technology. The alloy components were Nb-16Si-24Ti-2Cr-2Al, Nb- 18Si-24Ti-2Cr-2Al, Nb-20Si-24Ti-2Cr-2Al, Nb-22Si-24Ti-2Cr-2Al, using wire cutting to cut the circular substrates of the four alloys, with a diameter of 70mm and a thickness of 15mm, and the samples The surface is polished, cleaned and dried for later use;

[0038] 2. Fix the four alloy substrates on the workbench at the same time, and pump the sealed forming cavity into a high vacuum state;

[0039] 3. Use high-energy electron beams to preheat four kinds of Nb-Si alloy substrates. The preheating temperature is 1200°C. The specific preheating parameters are: accelerating voltage 30kV, scanning current 20mA, and electron beam focal spot size 100μm;

[0040] 4. After the preheating is over, set the corresponding processing parameters, and scan the surfa...

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Abstract

The invention discloses a method used for improving Nb-Si based alloy oxidation resistance via electron beam remelting, and belongs to the field of ultrahigh temperature alloy material. According to the method, under high vacuum conditions, the surface of a Nb-Si based alloy substrate is treated with high-power electron beam so as to realize melting and rapid solidifying of the alloy surface, obtain a surface remelted layer with fine compact defect-free microstructures, and realize metallurgy combination of the surface remelted layer with the Nb-Si based alloy substrate, and the high temperature oxidation resistance of the Nb-Si based alloy is improved via refining of the surface structure. The method is capable of inhibiting generation of cracks of brittle Nb-Si based alloy in rapid solidification process; operation is simple; and practicability is relatively high.

Description

technical field [0001] The invention belongs to the field of ultra-high temperature alloy materials, and in particular relates to a method for improving the oxidation resistance of Nb-Si based alloys by using electron beam surface remelting technology. Background technique [0002] Performance indicators such as thrust-to-weight ratio and working efficiency of modern aero-engines are constantly improving, and higher requirements are placed on the working temperature of hot-end components such as turbine blades. Taking a first-stage aero-engine with a thrust-to-weight ratio of 12-15 as an example, the maximum temperature at the front end of the turbine can reach 1800-2000°C. The blade temperature can be reduced by 400-500°C by using super-strong air-cooling technology. The temperature of the blade is reduced by 50-150°C, so the requirement for the temperature bearing capacity of the blade material itself reaches 1200-1400°C. At present, the service temperature of nickel-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/18
Inventor 贾丽娜郭跃岭彭徽张虎宫声凯徐惠彬
Owner BEIHANG UNIV
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