TC4钛合金选区激光熔化桥结构成形质量试验研究  

Experimental Study on Forming Quality of Selective Laser Melting Bridge for TC4 Titanium Alloy

作　　者：周裕圣 刘玉德[1] 石文天[1] 韩玉凡 李佳宜 Zhou Yusheng;Liu Yude;Shi Wentian;Han Yufan;Li Jiayi(School of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]北京工商大学人工智能学院,北京100048

出　　处：《应用激光》2022年第8期44-53,共10页Applied Laser

摘　　要：采用选区激光熔化技术制备TC4钛合金桥结构,研究了工艺参数和跨度对喷砂处理前后桥下表面表面粗糙度、致密度及桥下表面成形角度的影响。结果表明,随着跨度增大,试件致密度和桥下表面成形角度减小,当跨度为6 mm时,桥下表面成形角度边缘与垂直悬垂面出现断开状态。通过优化工艺参数,当跨度为4 mm、激光功率为285 W及点间距为50μm时,桥下表面表面粗糙度、致密度及桥下表面成形角度综合性能最好。喷砂处理后,致密度提高4%~15%,且呈稳定状态,最大致密度达到98.73%,桥下表面成形角度变小,最小成形角度为21.7°,不同工艺参数成形桥下表面成形角度与喷砂前变化趋势相似。通过观察显微组织发现,TC4样件的显微组织上均由针状马氏体α′相占据。Bridge structure was prepared with TC4 titanium by selective laser melting.The effects of process parameters and span lengths on surface roughness of under bridge surface,density and forming angle of under bridge surface before and after sandblasting were studied.The results show that with the increase of span lengths,the density and the forming angle of under bridge surface decrease.When the span lengths is 6 mm,the edge of the forming angle of under bridge surface disconnects with the vertical overhang surface.By optimized the process parameters,when the span lengths is 4 mm,the laser power is 285 W and the point spacing is 50μm,the comprehensive performance is best on surface roughness of under bridge,density and forming angle of under bridge surface.After sandblasting treatment,the density is increased by 4%-15%and remains stable,and the maximum density is 98.73%.The forming angle of under bridge surface become smaller,and the minimum forming angle is 21.7°.The changing trends of forming angle of under bridge surface by different process parameters are similar with before sandblasting.Through the observation of the microstructure of TC4 sample,the microstructure of TC4 sample is occupied by acicular martensiteα′phase.

关 键 词：选区激光熔化技术 桥结构 表面粗糙度 致密度 成形角度 

分 类 号：TN249[电子电信—物理电子学] TG146.23[一般工业技术—材料科学与工程]