研究目的
Investigating the fabrication of high strength and high conductivity Cu-Cr alloy components using high power selective laser melting and analyzing their microstructure and properties before and after heat treatment.
研究成果
High mechanical properties and high conductivity QCr0.8 copper alloy components were successfully fabricated by high power SLM. The properties of annealed samples improve significantly compared with the as-built samples, which are even better than the samples fabricated by rolling with post heat treatment.
研究不足
The study focuses on Cu-Cr alloy QCr0.8 and may not be directly applicable to other copper alloys. The high laser power requirement may limit the accessibility of the method.
1：Experimental Design and Method Selection
The study utilized selective laser melting (SLM) with high laser power to fabricate Cu-Cr alloy components. The microstructure, mechanical properties, and conductivity were analyzed before and after heat treatment.
2：Sample Selection and Data Sources
Gas atomized Cu-Cr alloy QCr0.8 powders were used as the starting material. The chemical composition of the powder is Cu-0.5Cr (wt%).
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
The samples were produced by optimized processing parameters (laser power 2000 W, scanning velocity 600 mm/s, hatching space 0.2 mm and layer thickness 0.05 mm). Post heat treatment condition was annealing at 480°C for 4 h followed by furnace cooling.
5：Data Analysis Methods
Microstructure characterization was performed using optical microscopy, SEM, and TEM. Phase structure was tested by XRD. Grain size was analyzed by EBSD. Microhardness, tensile properties, and electrical resistances were measured using respective testers.
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Scanning electron microscope
Nova NanoSEM 450
FEI
Characterization of microstructure.
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Transmission electron microscope
Tecnai-G2-F30
FEI
Characterization of microstructure.
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X-ray diffraction meter
X’pert PRO
PANalytical
Phase structure testing.
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fiber laser
YLR-2000
IPG
Used for selective laser melting process.
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Optical microscopy
EPIPHOT 300
Nikon
Characterization of microstructure.
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Microhardness tester
HVS-1000
Unknown
Microhardness testing.
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Tensile properties tester
Zwick/Roell tester
Zwick/Roell
Tensile properties examination at room temperature.
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DC resistance tester
CHT3540-1
Unknown
Electrical resistances measurement.
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