选区激光熔化316L不锈钢bcc点阵结构的支柱尺寸差异对其抗压缩性能的影响  

Effect of Strut Diameter Difference of bcc Lattice Structure of 316L Stainless Steel Prepared by Selective Laser Melting on Compression Performance

作　　者：王建东 管瑶 杨金水 王大鹏 窦文浩 Wang Jiandong;Guan Yao;Yang Jinshui;Wang Dapeng;Dou Wenhao(College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;Qingdao Innovation and Development Base,Harbin Engineering University,Qingdao 266000,China)

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学青岛创新发展基地,山东青岛266000

出　　处：《稀有金属材料与工程》2025年第1期126-133,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(12172098);中央高校基本科研业务费专项资金(3072024JJ1004)。

摘　　要：为研究支柱尺寸差异对bcc点阵结构抗压缩性能的影响,在相同密度下,设计了5种不同支柱尺寸的bcc-x点阵结构。采用选区激光熔化技术制备了316L不锈钢bcc-x点阵结构,使用材料塑性本构建立点阵结构准静态压缩的有限元分析模型。实验和模拟的结果表明:随着支柱比例因子x的增加,bcc点阵的抗压缩性能体现出先升后降的趋势,且x大于1后,抗压性能对x更敏感。x为1时可获得最优的抗压性能,bcc-1的比刚度、比强度和比能量吸收分别为986.794 MPa·cm^(3)·g^(-1)、25.084 MPa·cm^(3)·g^(-1)和11.731 J/g。与bcc-1相比,x的降低和增加都会破坏单元的对称性,且x越偏离1时,层间高应力区分布越不规律,结构的变形越易失稳。其中bcc-1.5的抗压性能最差,比刚度、比强度和比能量吸收相对于bcc-1分别降低了20.765%和12.265%和12.309%。In order to study the effect of strut diameter difference on the compression performance of body-centered cubic(bcc)lattice structure,five bcc-x lattice structures with different strut diameters were designed under the same density.316L stainless steel with bcc-x lattice structures were fabricated by selective laser melting technique.A finite element analysis model of quasi-static compression of the lattice structure was established using the plastic constitutive model of the material.The experimental and finite element simulation results show that with the increase in strut scale factor x,the compressive performance of bcc lattice shows a trend of first increasing and then decreasing,and when x is greater than 1,the compressive performance is more sensitive to x.When x is equal to 1,the optimal compressive properties can be obtained.The specific stiffness,specific strength and specific energy absorption of bcc-1 are 986.794 MPa·cm^(3)·g^(-1),25.084 MPa·cm^(3)·g^(-1)and 11.731 J/g,respectively.Compared with bcc-1,both the decrease and increase of x will destroy the axial symmetry of the cell,and the larger the x deviating from 1,the more irregular the distribution of high stress regions between layers,and the more unstable the deformation of the structure.The compressive performance of bcc-1.5 is the worst,and the specific stiffness,specific strength and specific energy absorption are reduced by 20.765%,12.265%and 12.309%,respectively,compared with those of bcc-1.

关 键 词：选区激光熔化 bcc点阵结构 支柱比例因子 抗压缩性能 有限元模拟 

分 类 号：TG142.71[一般工业技术—材料科学与工程]