In the present study, the variations of precipitated phases, microstructure and mechanical properties of different heat treatments were investigated. The main precipitated phases were Al and Si in different heat-treated specimens. The horizontal microstructures of as-deposited and below 280°C annealing appeared the interwoven structures, and the vertical microstructures were fish-scale structures. As the annealing temperatures were higher than 280°C, the interwoven and fish-scale structures disappeared because the Si phase precipitated and coarsen along the boundaries. With regard to the specimen was heat-treated by solution + artificial aging (T6), the strengths increased and ductility decreased, respectively compared with those of specimens at 420°C for 2 h. Moreover, The AlSi10Mg specimen annealing at 280°C for 2 h has excellent strength and ductility. This investigation indicates that the microstructure and mechanical properties of SLM AlSi10Mg alloy be tailored by different heat treatment processes.
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