Effects of heat treatment on microstructures and mechanical properties of AlSi10Mg alloy produced by selective laser melting
YU Kaibin, LIU Yunzhong, YANG Changyi
National Engineering Research Center of Near-net-shape Forming Technology for Metallic Materials, South China University of Technology, Guangzhou 510640, China
Abstract：AlSi10Mg alloy was prepared by selective laser melting (SLM) process, and then treated by annealing, solid solution and T6 treatment, respectively. The effects of heat treatment on microstructures and mechanical properties of AlSi10Mg alloy produced by SLM were investigated in order to improve heat treatment process of the alloy. The results show that the phases in as-built AlSi10Mg SLM products are α-Al matrix and eutectic Si. The eutectic structure [α-Al+Si] is continuous network distribution on the matrix of α-Al. The sections of both XOY and XOZ have coarse grain, fine crystal and heat affected zones. After annealing treatment, the eutectic Si network is partial dissolution and fracture, the strength decreases and the hardness increases slightly. While after T6 treatment, the eutectic Si appears with scattered and regular geometry inlays in the α-Al matrix, the tensile strength of the alloy decreases, yield strength slightly increases, and ductility significantly increases. In a comprehensive comparison with respect to strength and ductility, the T6 treatment is more suitable for the AlSi10Mg SLM products.
余开斌, 刘允中, 杨长毅. 热处理对选区激光熔化成形AlSi10Mg合金显微组织及力学性能的影响[J]. 粉末冶金材料科学与工程, 2018, 23(3): 298-305.
YU Kaibin, LIU Yunzhong, YANG Changyi. Effects of heat treatment on microstructures and mechanical properties of AlSi10Mg alloy produced by selective laser melting. Materials Science and Engineering of Powder Metallurgy, 2018, 23(3): 298-305.
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2018, Vol. 23 
