Journal
MATERIALS & DESIGN
Volume 140, Issue -, Pages 257-266Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.11.045
Keywords
Selective laser melting; Process optimization; AlSiMg0.75 alloy; Microstructure; Mechanical properties; Fracture morphology
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Funding
- National Natural Science Foundation of China [51405160]
- Key Projects of Guangdong Province Science and Technology plan [2015B01012500]
- Science and Technology Planning Project of Guangdong Province [2016B090925002]
- Guangzhou Talent Support for New Star of Pearl River [201710010064]
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A central composite design of experiment has been carried out to investigate the effect of selective laser melting (SLM) process parameters on the relative density of AlSiMg0.75 alloy and obtain samples with relative density of 99.0624%. Square samples and flat tensile samples were manufactured with optimized process parameters to study the evolution of microstructure, microhardness and tensile property. The microstructure of as-built samples shows fine grains and coarse grains with Al-rich cellular structure and Si-segregated network structure in top view. However, a large number of dendrite grains with very small space are observed in side view. After heat treatment, the cellular and dendrite structure broke into particles of different sizes with microhardness reduction and Si phase appearance by XRD and DSC. The heat treated samples show lower tensile strength and yield strength with the reduction of residual stress and Si solubility, and the destruction of small structures. But the elongation is higher than the as-built ones. The fracture morphology of as-built samples shows cleavages with small and shallow dimples, which indicates a mixture of brittle and ductile fracture. The fracture morphology of heat treated samples shows big and deep dimples, which indicates a ductile fracture. (C) 2017 Published by Elsevier Ltd.
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