选区激光熔化316L不锈钢混合点阵结构压缩性能和各向异性研究  

Compressive Performance and Anisotropy of Hybrid Lattice Structures of 316L Stainless Steel Fabricated by Selective Laser Melting

作　　者：唐映林 许明三 韦铁平 叶建华 林俊杰 TANG Yinglin;XU Mingsan;WEI Tieping;YE Jianhua;LIN Junjie(Fujian Key Laboratory of Intelligent Machining Technology and Equipment,Fujian University of Technology,Fuzhou 350118,China;School of Mechanical&Automotive Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建理工大学福建省智能加工技术及装备重点实验室,福州350118 [2]福建理工大学机械与汽车工程学院,福州350118

出　　处：《精密成形工程》2025年第4期203-216,共14页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51575110);福建省自然科学基金(2020J01872)。

摘　　要：目的在不损失原有点阵结构力学性能的前提下,提高多孔结构的吸能性能并降低各向异性,为多孔骨植入和能量吸收防护场合下多孔结构的应用提供参考。方法利用选区激光熔化设备制备点阵结构,通过压缩试验揭示孔隙率、点阵结构类型对力学性能和能量吸收特性的影响规律。通过静态压缩仿真和数值均匀化仿真,揭示不同单胞类型的破环机理和孔隙率对不同点阵结构各向异性的影响规律。结果RD点阵结构产生弯曲变形,FCC-RD和SC-RD产生混合变形模式。在相同体积下,随孔隙率的增加,多孔点阵结构的弹性模量、屈服强度及能量吸收不断降低。点阵结构按弹性模量和屈服强度从大到小的顺序依次是SC-RD、RD、FCC-RD和SC-RD、FCC-RD、RD。点阵结构按能量吸收从高到低的顺序依次是SC-RD、FCC-RD、RD。与菱形十二面体点阵结构(RD)相比,SC-RD混合点阵结构的弹性模量增加了4.89%~37.88%,屈服强度增加了13.25%~33.74%,能量吸收增加了15.36%~37.74%,比吸能增加了22.25%~42.66%。随着孔隙率的增加,3种点阵结构各向异性均增加,按各向异性从大到小的顺序依次为RD、FCC-RD、SC-RD。结论与RD点阵结构相比,新提出的混合点阵结构在对力学性能影响较小的前提下,具有更为优异的吸能性能和各向同性性能。The work aims to improve the energy absorption capabilities of porous structures and reduce the anisotropy without damaging the mechanical properties of the original lattice structure,so as to offer valuable insights for the utilization of porous structures in porous bone implants and energy absorption protection applications.The lattice structures were formed by selected laser melting and the effects of porosity and lattice structure type on the mechanical properties and energy absorption characteristics were revealed through compression test.Static compression simulations and numerical homogenization simulations revealed the failure mechanisms of different unit cell types and the effect of porosity on the anisotropic behavior of various lattice structures.The RD lattice structure exhibited bending deformation,while the FCC-RD and SC-RD structures displayed mixed deformation modes.Under the same volume,as the porosity increased,the elastic modulus,yield strength,and energy absorption of porous lattice structures continuously decreased.The elastic modulus and yield strength of lattice structures decreased in the following order of SC-RD,RD,FCC-RD,and SC-RD,FCC-RD,RD.The energy absorption of lattice structures,from the highest to the lowest,was in the order of SC-RD,FCC-RD and RD.Compared to the RD lattice,the elastic modulus of the SC-RD hybrid lattice structure increased by 4.89%to 37.88%,while the yield strength increased by 13.25%to 33.74%.The energy absorption improved by 15.36%to 37.74%,resulting in a 22.25%to 42.66%increase in specific energy absorption.As the porosity increased,the anisotropy of the three lattice structures also increased.The anisotropy,from the largest to the smallest,was in the order of RD,FCC-RD and SC-RD.Compared to the RD lattice structure,the newly proposed hybrid lattice exhibits superior energy absorption performance and isotropic behavior,while having minimal impact on mechanical properties.

关 键 词：激光选区熔化 力学性能 能量吸收 混合点阵结构 各向异性 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]