激光选区熔化多孔Ti6A14V合金压缩性能测试与分析  

Testing and Analysis of Compressive Properties of Selective Laser Melted Porous Ti6A14V Alloy

作　　者：郑晓峰[1] 周纯江[1] 顾盛挺 姚荣庆[1] 祝勇仁[1] Zheng Xiaofeng;Zhou Chunjiang;Gu Shengting;Yao Rongqing;Zhu Yongren(Institute of Intelligent Manufacturing,Zhejiang Institute of Mechanical and Electrical Technology,Hangzhou310053,Zhejiang,China)

机构地区：[1]浙江机电职业技术学院智能制造学院,浙江杭州310053

出　　处：《应用激光》2024年第6期1-9,共9页Applied Laser

基　　金：浙江省基础公益研究计划工业项目(LGG22E050048)。

摘　　要：为测试不同单元结构的多孔Ti6A14V合金试样压缩力学性能,设计孔径为550μm,孔隙率为65%,单元结构分别为90°V型、正四面体型、立方体型和正八面体型的多孔试样模型,通过激光选区熔化成型。观测了成型试样的外观结构形貌,结果与设计模型相近,失配率较低。实施静力学压缩试验,试验结果显示90°V型结构、正四面体结构、立方体结构和正八面体结构的抗压强度分别为51.69 MPa、358.32 MPa、202.54 MPa和279.72 MPa,弹性模量分别为2.39 GPa、9.67 GPa、5.88 GPa和7.81 GPa。对多孔结构的等效应力与应变进行仿真,显示90°V型结构峰值应力与应变远大于其他3种类型构件,其对应的承载能力最弱,正四面体结构整体应力分布均匀,承载能力最强,正八面体结构的承载能力强于立方体结构,仿真结果与试验结果吻合。最后观测了压缩试验后试样的断口形貌,断口含有大量撕裂棱,显示以脆性断裂为主。In order to test the compressive mechanical properties of porous Ti6A14V alloy specimens with different unit structures,porous specimen models with a pore size of 550μm,a porosity of 65%,and unit structures of 90°V-shaped,regular tetrahedron,cube,and regular octahedron were designed using laser selective melting.The appearance and structural morphology of the formed specimens were observed,and the results were similar to the designed models with a low mismatch rate.Static compression tests were conducted,and the test results showed that the compressive strengths of the 90°V-shaped,regular tetrahedron,cube,and regular octahedron structures were 51.69 MPa,358.32 MPa,202.54 MPa,and 279.72 MPa,respectively,with elastic moduli of 2.39 GPa,9.67 GPa,5.88 GPa,and 7.81 GPa,respectively.Simulations of the equivalent stress and strain in the porous structures demonstrated that the 90°V-shaped structure exhibited the highest peak stress and strain,suggesting the weakest load-bearing capacity.Conversely,the regular tetrahedron structure displayed a uniform stress distribution and the strongest load-bearing capacity.The regular tetrahedron structure had a uniform stress distribution and the strongest load-bearing capacity.The simulation results are consistent with the experimental results.Finally,the fracture morphologies of the specimens after compression testing were observed,showing a combination of a large number of tearing edges,indicating brittle fracture as the dominant failure mode.

关 键 词：激光选区熔化 TI6A14V合金 多孔结构 压缩性能 弹性模量 

分 类 号：TG115.5[金属学及工艺—物理冶金]