研究目的
A comparative study on single-laser and multi-laser selective laser melting AlSi10Mg to investigate defects, microstructure, and mechanical properties.
研究成果
Multi-laser SLM can fabricate AlSi10Mg parts with high efficiency and large size, but overlap areas have slightly lower density due to pores. Microstructure and mechanical properties are similar between isolated and overlap areas, with pores having limited influence. Cracks propagate along melt pool boundaries. Annealing changes Si morphology but not grain size, reducing strength due to weakened solid solution strengthening.
研究不足
The study is limited to AlSi10Mg alloy and a specific multi-laser SLM system. Pores in overlap areas reduce density and mechanical properties slightly. Future work needed to eliminate pores and improve elongation by optimizing laser parameters and scanning strategies.
1：Experimental Design and Method Selection:
The study uses a self-developed multi-laser beam SLM system to fabricate AlSi10Mg samples, comparing isolated and overlap areas. Optimal processing parameters were selected based on highest relative density. Methods include optical microscopy, SEM, EBSD, XRD, ICP-AES, microhardness testing, and tensile testing.
2：Sample Selection and Data Sources:
Gas-atomized spherical AlSi10Mg powders with average particle size D50 of 33.7μm were used. Samples include small cubic samples (10x10x10 mm3) for parameter optimization and tensile samples machined according to ISO 6892-1-
3：7μm were used. Samples include small cubic samples (10x10x10 mm3) for parameter optimization and tensile samples machined according to ISO 6892-1-List of Experimental Equipment and Materials:
2009. 3. List of Experimental Equipment and Materials: Equipment includes a multi-laser beam SLM system (NRD-SLM-500), optical microscopy (Nikon EPIPHOT 300), SEM (FEI Nano 450, FEI Sirion 200 with EBSD), XRD (X'Pert PRO), ICP-AES, microhardness tester (HVS-1000), tensile tester (Zwick/Roll). Materials include AlSi10Mg powders, Keller reagent for etching, perchloric acid and ethanol for electro-polishing.
4：Experimental Procedures and Operational Workflow:
Samples were built using optimal parameters (laser power 490 W, scanning speed 1800 mm/s, hatch spacing 100 μm, layer thickness 40 μm) in argon atmosphere. Some samples underwent stress relief at 300°C for 2h. Density was measured via optical micrograph analysis, microstructure via etching and microscopy, mechanical properties via standardized tests.
5：2h. Density was measured via optical micrograph analysis, microstructure via etching and microscopy, mechanical properties via standardized tests. Data Analysis Methods:
5. Data Analysis Methods: Relative density calculated using Image-Pro Plus 6.0 software. Microstructure analyzed with EBSD (step size 0.8 μm), XRD for phase identification. Mechanical properties averaged from 3 samples. Statistical analysis not specified beyond averaging.
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scanning electron microscopy
FEI Nano 450
FEI
Used for microstructure observation and fracture morphology analysis.
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scanning electron microscopy
FEI Sirion 200
FEI
Coupled with EBSD system for quantitative microstructure analysis.
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X-ray diffraction
X'Pert PRO
PANalytical
Used for phase characterization of samples.
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multi-laser beam SLM system
NRD-SLM-500
self-developed
Used for fabricating AlSi10Mg samples via selective laser melting, enabling multi-laser processing in a large building chamber.
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optical microscopy
Nikon EPIPHOT 300
Nikon
Used for observing microstructure of samples after polishing and etching.
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inductively coupled plasma atomic emission spectrometry
Used for measuring Mg element content in samples.
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microhardness tester
HVS-1000
Used for testing microhardness of samples at specified load and holding time.
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tensile tester
Zwick/Roll
Zwick
Used for performing tensile tests at room temperature.
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