Effect of Scanning Strategy and Preheating Temperature on Properties of Large-Scale AlSi10Mg Alloy Prepared by Selective Laser Melting

The influence of scanning strategy (chessboard scanning and meander scanning) and substrate preheating temperature (80℃ and 120℃) on microstructure, mechanical properties and density of large-scale AlSi10Mg alloy sample prepared by selective laser melting. The results show that relative density, impact property and tensile property were mainly affected by the scanning strategy, while the preheating temperature determined the hardness of sample. When scanning strategy was chessboard scanning and preheating was at 80℃, the sample had the highest relative density (98.69%), the best tensile property and impact toughness. When scanning strategy was chessboard scanning and preheating was at 120℃, the sample had the highest hardness (257 HV).