[5] [5] AHN D G.Applications of laser assisted metal rapid tooling process to manufacture of molding & forming tools-state of the art［J］.International Journal of Precision Engineering and Manufacturing, 2011, 12(5)：925-938.

[6] [6] ZHANG S, WEI Q S, CHENG L Y, et al.Effects of scan line spacing on pore characteristics and mechanical properties of porous Ti6Al4V implants fabricated by selective laser melting［J］.Materials & Design, 2014(63)：185-193.

[7] [7] WEN S F, LI S, WEI Q S, et al.Effect of molten pool boundaries on the mechanical properties of selective laser melting parts［J］.Journal of Materials Processing Technology, 2014, 214(11)：2660-2667.

[8] [8] ZHAO X, WEI Q S, SONG B, et al.Fabrication and characterization of AISI 420 stainless steel using selective laser melting［J］.Materials and Manufacturing Processes, 2015, 30(11)：1283-1289.

[9] [9] VENTURA A P, WADE C A, PAWLIKOWSKI G, et al.Mechanical properties and microstructural characterization of Cu-4.3%Sn fabricated by selective laser melting［J］.Metallurgical and Materials Transactions：A, 2017, 48(1)：178-187.

[10] [10] MAO Z, ZHANG D Z, WEI P, et al.Manufacturing feasibility and forming properties of Cu-4Sn in selective laser melting［J］.Materials, 2017, 10(4)：333.

[11] [11] SONG B, DONG S J, DENG S H, et al.Microstructure and tensile properties of iron parts fabricated by selective laser melting［J］.Optics & Laser Technology, 2014(56)：451-460.