选区激光熔化成型多孔Ti6Al4V合金及其热处理研究  

Study on Porous Ti6Al4V Alloy Formed by Selective Laser Melting and Its Heat Treatment

作　　者：张永弟[1] 王琮瑜 王琮玮 杨光[1] Zhang Yongdi;Wang Congyu;Wang Congwei;Yang Guang(School of Mechanical Engineering,Hebei University of Technology and Science,Shijiazhuang 050018,China)

机构地区：[1]河北科技大学机械工程学院,河北石家庄050018

出　　处：《稀有金属材料与工程》2022年第5期1690-1696,共7页Rare Metal Materials and Engineering

基　　金：河北省自然科学基金(E2017208128);河北省技术创新引导计划(20477706D);中央引导地方科技发展资金(206Z1806G);石家庄市科学技术研究与发展计划(201200313A)。

摘　　要：Ti6Al4V合金是骨科中应用最为广泛的钛合金,选区激光熔化成型多孔Ti6Al4V合金能够降低其弹性模量,减少应力遮挡现象,促进骨组织的长入,但成型件的塑性通常较低。为此设计了单元尺寸在1~2 mm、孔径在500~1200μm、孔隙率在60%~90%之间的菱形十二面体多孔结构并采用选区激光熔化技术成型了压缩试件,通过压缩仿真和实验对其力学性能进行研究,并研究了退火热处理对其力学性能、显微组织的影响。仿真结果表明,对模型的支杆直径进行误差补偿可获得更为准确的结果。实验结果表明当单元尺寸为1.5 mm时,试件的抗压强度在78.16~242.94 MPa之间,弹性模量在1.74~4.17 GPa之间,与人体皮质骨的力学性能相近。试件经820℃退火2 h后的抗压强度、弹性模量与成型态基本保持相当,而塑性有所提升,因此更适用于骨科植入体。Ti6Al4V alloy is the most widely used titanium alloy in orthopedics.Selective laser melting of porous Ti6Al4V alloy can reduce its elastic modulus,reduce the stress shielding phenomenon,and promote the growth of bone tissue,but the plasticity of the formed parts is usually low.Therefore,rhombohedral dodecahedron porous structures with unit size of 1~2 mm,aperture of 500~1200μm and porosity of 60%~90%were designed,and the compression specimens were formed by selective laser melting technology.The mechanical properties were studied by compression simulation and experiments,and the effects of annealing heat treatment on the mechanical properties and microstructure were also studied.The simulation results show that more accurate results can be obtained by error compensation for the strut diameter of the model.The experimental results show that when the unit size is 1.5 mm,the compressive strength and elastic modulus of specimens are between 78.16~242.94 MPa and 1.74~4.17 GPa,respectively,which are similar to the mechanical properties of human cortical bone.After annealing at 820℃ for 2 h,the compressive strength and elastic modulus of the specimens are basically the same as those of the formed specimens,while the plasticity is improved,so they are more suitable for orthopedic implants.

关 键 词：选区激光熔化 多孔结构 TI6AL4V合金 退火 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]