Method for preparing NbSi-base ultrahigh-temperature alloy through EBM (Electron Beam Melting)

A technology of ultra-high temperature alloy and forming technology, which is applied in the direction of improving energy efficiency and process efficiency, and can solve the problem of difficult to meet the forming requirements of Nb-Si-based alloy investment casting, multi-machining and post-processing, and coarsening of alloy structure. and other problems, to achieve the effect of eliminating the process of designing and manufacturing molds, avoiding machining and post-processing, and high material utilization.

Inactive Publication Date: 2014-07-30
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of traditional directional solidification mainly include: the cooling rate is low during the solidification process, which leads to the coarsening and growth of the alloy structure, which limits the improvement of the alloy performance. Elements, so it is very easy to have interface reaction with the contacting crucible at high temperature, causing alloy pollution, increased oxygen content, increased casting inclusions, and decreased mechanical properties
Investment casting of Nb-Si based alloys has a shell temperature capacity exceeding 2000°C. However, the shell temperature capacity currently used for investment casting of high-temperature structural materials does not exceed 1700°C. Alloy reaction, it is difficult to meet the requirements of Nb-Si based alloy investment casting
[0005] Not only that, the preparation of NbSi alloys by the above methods requires crucibles or molds, so it is difficult to directly prepare alloy parts with specific dimensions and complex shapes and structures (variable cross-sections, inner cavities or cooling channels), often requiring more machining And post-processing, the process is cumbersome, the production efficiency is low, and it is easy to cause waste of alloy materials

Method used

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  • Method for preparing NbSi-base ultrahigh-temperature alloy through EBM (Electron Beam Melting)
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  • Method for preparing NbSi-base ultrahigh-temperature alloy through EBM (Electron Beam Melting)

Examples

Experimental program
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Embodiment 1

[0036] Nb-18Si-24Ti-2Cr-2Al-2Hf (at.%, atomic percent) superalloy prepared by EBM technology:

[0037] (1). Nb-18Si-24Ti-2Cr-2Al-2Hf pre-alloyed powder prepared by argon atomization method, the powder is spherical or nearly spherical, and the diameter is between 50 and 150 μm;

[0038] (2). First, use the 3D drawing software (Magics) to establish a 3D CAD model of the NbSi alloy sample, and save it as an STL file; then use the layering software (EBM assembler) to perform layered slice processing on the STL file in the height direction, and segment Slices with a uniform thickness (0.1mm), which contain the cross-sectional profile information of the alloy sample; use layering software to save the slice as an ABF file, and import it into the electron beam rapid prototyping equipment (EBM);

[0039] (3). Put the Nb-18Si-24Ti-2Cr-2Al-2Hf pre-alloyed powder into the molding cavity, put the Ti6Al4V forming substrate with a thickness of 10mm on the platform that can be lifted in the f...

Embodiment 2

[0047] Nb-16Si-22Ti-4Cr-2Al-2Hf (at.%, atomic percent) superalloy prepared by EBM technology:

[0048] (1). Nb-16Si-22Ti-4Cr-2Al-2Hf pre-alloyed powder prepared by argon atomization method, the powder is spherical or nearly spherical, and the diameter is between 50 and 150 μm;

[0049] (2). First, use the 3D drawing software (Magics) to establish a 3D CAD model of the NbSi alloy sample, and save it as an STL file; then use the layering software (EBM assembler) to perform layered slice processing on the STL file in the height direction, and segment Slices with a uniform thickness (0.07mm), which contain the cross-sectional profile information of the alloy sample; use layering software to save the slice as an ABF file, and import it into the electron beam rapid prototyping equipment (EBM);

[0050] (3). Put the Nb-16Si-22Ti-4Cr-2Al-2Hf pre-alloyed powder into the forming cavity, put the Ti6Al4V forming substrate with a thickness of 10mm on the platform that can be lifted in the ...

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Abstract

The invention belongs to the technical field of high-temperature alloy preparation and particularly relates to a method for preparing NbSi-base ultrahigh-temperature alloy through EBM (Electron Beam Melting). By using electron beam selective melting equipment and arranging reasonable process parameters, the preparation of an NbSi-base alloy three-dimensional formed part can be completed in one step directly through a CAD (Computer-Aided Design) model. The density of the obtained NbSi-base alloy is high, the NbSi-base alloy mainly comprises NbSS (Nb Solid Solution) and an Nb5Si3 strengthening phase, the phase size is very fine (smaller than 1[mu]m) and the distribution is uniform. The method has the advantages that a mold is not needed during the preparation of the NbSi-base alloy, the alloy pollution is reduced, the impurity content is decreased, the material utilization ratio is high, and the mechanical property and the production efficiency of the NbSi-base ultrahigh-temperature alloy can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy preparation, and in particular relates to a method for preparing NbSi super-high-temperature alloy by electron beam rapid forming. Background technique [0002] Gas turbine engines play a pivotal role in aerospace, energy power, transportation and other fields. Their efficiency and performance are inseparable from high-temperature structural materials. In recent years, environmental problems such as global warming caused by greenhouse gas emissions have increasingly caused People's attention, so improving energy utilization efficiency, energy saving and emission reduction has far-reaching significance. At present, the energy utilization efficiency achieved by gas turbine engines is about 40%. If it is to be further improved, it is necessary to develop high-temperature structural materials with higher temperature bearing capacity. [0003] At present, the maximum service temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22C1/04C22C19/03
CPCY02P10/25
Inventor 宫声凯孙少波张虎彭徽徐惠彬
Owner BEIHANG UNIV
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