Electron beam melting 3D printing titanium aluminum complex structural parts
TiAl based alloy has the characteristics of low density, high specific strength, high modulus, high temperature oxidation resistance, etc., which is about 50% lighter than nickel based superalloy.
Electron beam melting metal 3D printing technology for the preparation of TiAl based alloy materials as a new and most advanced forming method, is considered to be the best choice for forming TiAl based alloy materials, and its unique micro-zone melting, cycle heat treatment, rapid solidification and other technological advantages. The problems of coarse structure and loose solidification structure in casting, ingot metallurgy and powder metallurgy are overcome. Due to its own characteristics, it brings great technical challenges to the electron beam forming process.
In March 2021, the technical difficulties such as powder collapse (blowing powder), insufficient interlayer bonding, volatilization of aluminum, low density, uneven transverse and longitudinal structure properties of parts were solved in the process of electron beam forming TiAl alloy.
Optimization and upgrading of process parameters for preparing large-size complex structural parts by electron beam melting 3d printer technology, targeted regulation of the microstructure evolution of materials at different heights, and modification of process parameters and printing conditions, the Ø110mm×66mm highly dense and crack-free Ti-48Al-2Cr-2Nb supercharger turbine was successfully formed. New breakthroughs have been made in titanium and aluminum complex structural parts. At the same time, by optimizing the scanning path and beam spot focus, the forming process of thin-walled curved transition parts has been overcome.
Electron beam powder burst instantaneously
Through the optimization and upgrading of the preheating process, the high size test rod with the same performance at different heights has been successfully printed
Electron beam 3D printing height 90mm Ti-48Al-2Cr-2Nb tensile test rod
After the late tissue regulation, the transverse and longitudinal microstructure of the Ti-48Al-2Cr-2Nb specimen was more uniform, and the density could reach more than 99.6%. The following table shows the average mechanical properties of the transverse and longitudinal test bar.
|
Temperature |
Yield strength |
Tensile strength |
Rate of elongation |
|
650°C |
≥410 |
≥500 |
≥1.2 |
|
Room temperature |
≥430 |
≥510 |
≥1.8 |
Mechanical properties of Ti-48Al-2Cr-2Nb powder printed by electron beam technology
Electron beam forming Ø110mm×66mm Ti-48Al-2Cr-2Nb alloy turbocharger
Electron beam 3D printing height 90mm Ti-48Al-2Cr-2Nb tensile test rod
It is reported that GE Aviation has officially announced that the GE9XFAA engine has been certified by the Federal Aviation Administration (FAA), and the engine has more than 300 additive manufacturing parts, of which the titanium aluminum low-pressure turbine blade formed by electron beam selective melting technology is one of them.
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Post time: Nov-17-2023