蜂窝状多孔316 L不锈钢的选区激光熔化制备

Preparation of Honeycomb-like Porous 316L Stainless Steel by Selective Laser Melting

摘要:

对含预合金316L不锈钢和NH4HCO3(质量比96:4)的混合粉末进行选区激光熔化，制备多孔材料的实验研究。利用扫描电镜分析试样的微观孔隙特征。结果表明，在较高激光功率(800 W)条件下，可形成蜂窝状的多孔结构，孔径分布均匀(2~5 μm)，平均孔径约3.5 μm。分析激光功率对多孔结构特征的影响，讨论选区激光熔化蜂窝状多孔结构的形成机制

Abstract:

The selective laser melting of a blended powder system consisting of 96wt% 316L stainless steel and 4wt% NH4HCO3 was performed to prepare porous materials. The SEM characterizations show the formation of a honeycomb-like porous structure at a relatively high laser power of 800 W. The pore sizes of the porous structure distribute homogeneously, typically in a range of 2-5 μm. The average pore size is about 3.5 μm. The effects of laser power on the microstructural characteristics of the as-obtained microcellular structures were investigated. The formation mechanisms of the honeycomb-like porous structure during selective laser melting were also discussed.