Abstract: The process of AlSi7Mg alloy fabricated by selective laser manufacturing (SLM) was studied. The microstructure and mechanical properties of as-built specimens using optimum process parameters and heat-treated specimens were analyzed. The results show that the tensile strength, yield strength and elongation of SLMed AlSi7Mg as-built specimens are much higher than those of casting AlSi7Mg, and horizontal as-built specimens could reach 435.78 MPa, 299.23 MPa and 14.36%, respectively. Heat treatment has a great influence on the microstructure and mechanical properties of SLMed specimens. After 350 ℃/3 h annealing, the elongation of the specimen increases to 30.83% and the tensile strength and yield strength decrease to 210.35 MPa and 152.01 MPa, respectively. It has been found that the size and shape of grains could be controlled in accordance with required microstructure and mechanical properties by changing process parameters and heat treatment conditions.
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2020, Vol. 34 
