A kind of aluminum alloy powder that can be used for 3D printing and its preparation method and application
A 3D printing, aluminum alloy technology, applied in the field of aluminum alloy powder and its preparation, can solve the problems of poor electrochemical corrosion ability, low strength and ductility, material stress corrosion, etc., to reduce H2O content, improve performance, reduce oxidation effects of things
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Embodiment 1
[0050] This embodiment provides a special aluminum alloy for SLM printing, which contains the following components in mass percentage: Mg: 9.00wt%; Sc: 0.80wt%; Zr: 0.55wt%; Mn: 0.50wt%; Fe: 0.01 wt%; Cu: 0.20wt%; Si: 0.05%; Zn: 1.05wt%; Cr: 0.08wt%; Ni: 0.06wt%, and the rest is Al.
[0051] Its preparation method is:
[0052] (1) Vacuum smelting, and then use argon atomization to make powder: smelting temperature is 820°C, and the pressure in the smelting furnace is 0.6MPa;
[0053] (2) Then adopt argon gas as the medium to atomize the metal droplet, and the atomization pressure is 7Mpa;
[0054] (3) The prepared powder is spherical in shape and sieved with 250 mesh to obtain a powder with an average particle size of about 25 μm. Dry the sieved powder at 90°C for 8 hours in a vacuum drying oven, which can be used for SLM printing .
[0055] After testing, the microhardness of the powder is 125Hv, the grain size inside the powder is 2μm, and the Al inside the powder 3 Sc, ...
Embodiment 2
[0057] A kind of SLM printing workpiece, the steps are as follows:
[0058] (1) Increase the heating temperature of the printing substrate to 180°C;
[0059] (2) carry out SLM printing after the selected area laser melting of the aluminum alloy powder obtained in embodiment 1;
[0060] Among them, laser power: 200W; scanning speed: 600mm / s; scanning distance: 0.05mm; powder layer thickness: 0.03mm.
[0061] The grain size of the microstructure of the obtained workpiece is 0.7 μm, and there is 3 nm of dispersed Al in the grain 3 Sc, Al 3 Zr and Al 6 Mn nanoparticles are precipitated.
[0062] The tensile property of the obtained workpiece is 485MPa, the elongation is 17%, and the stress corrosion resistance SCC is 247.
[0063] The obtained workpiece was heat-treated at 288° C. and kept in a vacuum annealing furnace for 4 hours. The tensile strength of the obtained workpiece could reach 550 MPa, the elongation rate reached 15%, and the stress corrosion resistance SCC was 2...
Embodiment 3
[0065] A special aluminum alloy for SLM printing, which contains the following components in mass percentage: Mg: 4.50wt%; Sc: 0.60wt%; Zr: 0.30wt%; Mn: 0.5wt%; Fe: 0.01wt%; Cu Si: 0.15%; Zn: 0.5wt%; Cr: 0.02wt%; Ni: 0.05wt%, and the rest is Al.
[0066] Its preparation method is:
[0067] (1) Vacuum smelting, followed by argon atomization to make powder: smelting temperature is 850°C, and the pressure in the smelting furnace is 0.5MPa;
[0068] (2) Then adopt argon gas as the medium to atomize the metal droplet, and the atomization pressure is 7Mpa;
[0069] (3) The prepared powder is spherical in shape and sieved with 250 mesh to obtain a powder with an average particle size of about 28 μm. Dry the sieved powder at 90°C for 8 hours in a vacuum drying oven, which can be used for SLM printing .
[0070] After testing, the microhardness of the powder is 145Hv, the grain size inside the powder is 4μm, and the Al inside the powder 3 Sc, Al 3 Zr、Al 2 Cu and Al 6 The size of...
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