激光选区熔化制备钛合金点阵材料无损表征

通过激光选区熔化制备BCC和DOD结构的钛合金金属点阵,使用Micro–CT对两种结构的钛合金点阵材料进行扫描和三维重建。Micro–CT图像清晰地显示金属点阵内部结构,BCC和DOD单胞整齐地以周期性进行排列,且内部存在少量圆形、椭圆形缺陷。通过将实际样品三维数据与CATIA数模进行比对,发现钛合金点阵在制备过程中出现一定程度翘曲。此外使用共聚焦显微镜并基于Micro–CT图像对BCC和DOD两种金属点阵进行表面粗糙度测定。结果表明,Micro–CT在钛合金点阵材料内部结构、缺陷、制备误差、粗糙度测试等表征方面具有显著的应用价值。

Nondestructive Characterization of Titanium Alloy Lattice Materials Prepared by Laser Selective Melting

The titanium alloy lattice with BCC and DOD structure is prepared by laser selective melting.Micro–CT is used to scan and 3 D reconstruct the titanium alloy lattice materials with these two kinds of structures.Clear internal structure can be seen in these lattices and a few round and oval defects can be found.BCC and DOD cells are arranged neatly and periodically with no slag,collapse or rod bending.Through comparison of CATIA model and 3 D reconstruction data of lattice structures,it is found that the alloy lattice is bended.In addition,the surface roughness of BCC and DOD metal lattices is measured and calculated using confocal microscope based on Micro–CT image.The results show that Micro–CT has significant application value in the characterization of the internal structure,defects,preparation errors and roughness testing of titanium alloy lattice materials.