电子束3D打印极小曲面多孔TC4钛合金及其性能研究

Design and Properties of Porous TC4 Titanium Alloy with Minimal Curved Surface by Electron Beam 3D Printing

介绍了极小曲面多孔结构设计方法,并采用电子束3D打印技术制备了极小曲面多孔TC4钛合金,对比分析了沉积态组织与热处理后显微组织变化,以及不同表观密度下试样的压缩性能。研究结果表明:采用Rhino建模软件为设计主体,并配合Grasshopper插件的程序算法,可参数化生成极小曲面模型,再用3-matic拓扑优化软件进行曲面多孔化处理,可建立极小曲面多级孔模型;极小曲面多孔TC4钛合金的抗压强度随着表观密度的增加而增大,在表观密度为0.74 g/cm 3时抗压缩强度达到49.33 MPa;沉积态组织主要由β柱状晶组成,经1000℃×2 h/FC退火处理后,组织转变为魏氏组织。

The design method of porous structure with minimal curved surface was introduced,and the porous TC4 titanium alloy with minimal curved surface was fabricated by electron beam 3D printing technology.The microstructure changes of as deposited and heat-treated specimens were compared and analyzed,as well as the compressive properties of the samples under different apparent densities.The research results show that using Rhino software as the main design body,and with the program algorithm of Grasshopper plug-in,the minimal surface model can be parameterized,and then the 3-matic topology optimization software can be used to carry out the surface multi-hole processing.With this method,the model of multi-stage holes with minimal surface can be established.The compressive strength of porous TC4 titanium alloy with minimal curved surface increases with the increase of apparent density.When the apparent density is 0.74 g/cm 3,the compressive strength reaches 49.33 MPa.The deposited microstructure is mainly composed ofβ-columnar crystals,and the microstructure changes into Widmanstatten structure after annealing at 1000℃for 2 h/FC.