EIGA法制备TC4合金粉末的激光3D打印性能研究

Research on Laser 3D Printing Performance of TC4 Alloy Powder Prepared by EIGA

采用电极感应熔炼气雾化法制备了50~180μm激光3D打印用TC4合金粉末,研究了粉末截面微观组织和成分,并采用激光3D打印成形了TC4合金样品,研究了松装密度对激光3D成形熔池截面形貌的影响,粉末粒径范围对打印样品的微观组织、拉伸断口形貌的影响。结果表明:TC4合金粉末内部组织存在大量的针状马氏体;随着松装密度增大,熔池的宽度和高度先增大后减小,激光3D打印成形TC4钛合金最佳松装密度为2.696~2.792g/cm^3;块状魏氏体组织随打印粉末的粒径范围减小而减少,致使拉伸断口形貌中韧窝密集程度逐渐增大,样品塑性提高。打印样品DSC分析相变起始温度为830.09℃、峰值温度为927.39℃均低于稳态相变温度,表明打印样品内存在大量亚稳相。

The TC4 spherical powder（50-180μm）for laser 3D printing were prepared by the electrode induction melting gas atomization.The cross section microstructure of powder was studied.TC4 alloy samples were printed by laser 3D printing technology,and the effects of particle size ranges on microstructure and tensile fracture morphology of printing sample were researched.The results show that powder cross section existed a large number of acicular hexagonal close-packed martensite.The width and height of molten pool were first increased and then decreased with the increasing of the powder apparent density,and the best apparent density range for 3D printing were 2.696-2.792g/cm^3.The widmonstatten structure in printing sample were decreased in the decrease of particle size range,which leads to gradually increasing of the tough dimples in the fracture morphology.However,phase transformation initial temperature 830.09℃ and peak temperature927.39℃ were below steady state phase transition temperature,so it shows that many metastable phases exists in the TC4 sample printed by laser 3D printing technology.