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Acta Metall Sin  2017, Vol. 53 Issue (8): 918-926    DOI: 10.11900/0412.1961.2016.00472
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Study on the Selective Laser Melting of AlSi10Mg
Wenqi ZHANG, Haihong ZHU(), Zhiheng HU, Xiaoyan ZENG
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
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The growing interest for a wide range of usable Al alloy parts with complex shape in industrial field makes selective laser melting (SLM) stand out as a new technology for rapid prototyping manufacturing. The objective of this work is to investigate AlSi10Mg cast aluminum alloy manufacturing by SLM. The investigation involved the influence of process parameters on the relative density and the influence of heat treatment on the microstructure and mechanical properties. High density and performance were achieved. The results show that the tensile strength of the SLMed AlSi10Mg is much higher than that of press wrought AlSi10Mg, but the elongation is as almost same as that of the press wrought AlSi10Mg. The heat treatment has a significant effect on the mechanical properties and microstructure of SLMed AlSi10Mg parts. The mechanical properties changes with the annealing temperature. Compared with the mechanical properties without annealing process, the tensile strength decreases from 507~518 MPa to 378~406 MPa and the elongation increases from 3.0%~3.5% to 6.5%~9.0% when the annealing temperature is 300 ℃ and the soap time is 2 h because of the changes in the morphology and distribution of the Si.

Key words:  AlSi10Mg      selective laser melting      mechanical property      heat treatment     
Received:  24 October 2016     
ZTFLH:  TG665  
Fund: Supported by National Natural Science Foundation of China (No.61475056), Fundamental Research Funds for the Central Universities (No.2016XYZD00), Natural Science Foundation of Hubei Province (No.2014CFA049) and Director Fund of Wuhan National Laboratory for Optoelectronics

Cite this article: 

Wenqi ZHANG, Haihong ZHU, Zhiheng HU, Xiaoyan ZENG. Study on the Selective Laser Melting of AlSi10Mg. Acta Metall Sin, 2017, 53(8): 918-926.

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Fig.1  Schematic of experimental device
Fig.2  Influence of scanning velocity (v) on the relative density of selective laser melted (SLMed) AlSi10Mg
Fig.3  OM images of SLMed AlSi10Mg under different scanning velocities

(a) 50 mm/s (b) 100 mm/s (c) 250 mm/s (d) 300 mm/s (e) 550 mm/s (f) 600 mm/s

Fig.4  Influence of hatching space (h) on the relative density of SLMed AlSi10Mg
Fig.5  Influence of slice thickness (s) on the relative density of SLMed AlSi10Mg
Fig.6  Cross-sectional SEM images of SLMed AlSi10Mg

(a) heat-affected zone (HAZ) (b) fine grain zone and coarse grain zone

Fig.7  EDS scanning results of SLMed AlSi10Mg
Fig.8  Microstructures of SLMed AlSi10Mg (a) and heat treated AlSi10Mg samples at 230 ℃ (b) and 300 ℃ for 2 h (c)
Fig.9  XRD spectra for AlSi10Mg samples at different states
Fig.10  Stress-strain curve of SLMed AlSi10Mg specimen
Fig.11  Influence of scanning velocity on the microhardness of SLMed AlSi10Mg
Fig.12  Mechanical properties of the SLMed and heat treated AlSi10Mg specimens at room temperature (UTS—tensile strength, σ—yield strength, δ—elongation)
Fig.13  Microhardnesses of the SLMed AlSi10Mg specimens under different heat-treatment processed
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