Mechanical properties of Ti-6Al-4V thin walls fabricated by laser powder bed fusion

被引:5
作者
Lee, Junghoon [1 ]
Hussain, Arif [1 ]
Ha, Jeonghong [2 ]
Kwon, Youngsam [3 ]
Kim, Rae Eon [4 ]
Kim, Hyoung Seop [4 ]
Kim, Dongsik [1 ]
机构
[1] Pohang Univ Sci & Technol POSTECH, Dept Mech Engn, Pohang 37673, South Korea
[2] Korea Inst Ind Technol KITECH, Smart Forming Proc Grp, Ulsan 44413, South Korea
[3] CetaTech Inc, 66-15 Osongsaeng Myeong 2 Ro, Cheongju 28161, South Korea
[4] Pohang Univ Sci & Technol POSTECH, Grad Inst Ferrous & Energy Mat Technol, Pohang 37673, South Korea
关键词
High-aspect-ratio thin wall; Mechanical properties; Laser powder bed fusion; Size effect; Ti-6Al-4V; ALSI10MG ALLOY; FATIGUE; PARTS; MICROSTRUCTURE; COMPONENTS; THICKNESS; PARAMETER; STRESS; STATE; SLM;
D O I
10.1016/j.addma.2024.104484
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Laser powder bed fusion (PBF-LB/M) has recently garnered considerable attention for fabricating thin walls owing to its potential for producing lightweight structures. However, knowledge of the mechanical properties of thin walls with high surface-to-volume ratios remains insufficient. Specifically, no studies have been conducted for thin walls with a thickness less than 400 mu m, making the size effect unclear. Therefore, the main objective of this work is to reveal the effect of thicknesses on the mechanical properties of Ti-6Al-4V samples as thin as 195 mu m. To achieve this, the fabrication process was optimized to maximize the aspect ratio and properties of samples. In addition, the microstructure and surface roughness were examined to understand the size effect. The results demonstrated that the ultimate tensile strength of the thin-wall samples was similar to that of bulk Ti-6Al4V samples fabricated via PBF-LB/M, regardless of the thickness. By contrast, the elongation of the thin-wall samples decreased with thickness, indicating a significant size effect. This size effect on elongation can be attributed to the strong influence of surface and internal defects.
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页数:13
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