电子束3D打印循环使用Ti-6Al-4V合金粉体特性研究

Study on the Characteristics of Recycled Ti-6Al-4V Alloy Powder for Electron Beam 3D Printing

摘要:

研究了电子束3D打印时循环使用Ti-6Al-4V合金粉体对其特性的影响。研究结果表明,随着循环次数的增加,旧粉中的细粉量减少,颗粒间粘结增加,颗粒粒径分布向粗颗粒聚集,粉床上颗粒摩擦阻力下降,压缩性提高,块状残留物增加;循环使用粉体对构件轮廓精度几乎没有影响,但使构件相对致密性下降。添加新粉能改善旧粉性能变差带来的不利影响,改善程度与添加新粉数量有关。

Abstract:

The effect of Ti-6Al-4V alloy powder recycling on the properties of powder for electron beam 3D printing was studied. The results show that with the increase of the number of cycles,the mass of the fine powder in the old powder decreases,the adhesion between the particles increases,the particle size distribution gathers to the coarse particles,the friction resistance of particles on the powder bed decreases,the compressibility increases,and the block residue also increases; the recycling of powder has little effect on the profile accuracy of the components,and the relative compactness decreases. Adding new powder can improve the bad performance of old powder,and the degree of improvement is related to the quantity of new powder.