The dynamic arch bending mechanism of flat bridge structure of AlSi10Mg during SLM process

Zhang, Xiaochuan1; Wang, Jiwu2; Kang, Jinwu3; Rong, Yiming1,4; Duan, Guoqing5; Wu, Pengyue5; Zheng, Lele2

2020

10.1016/j.matdes.2020.108469

Materials and Design   影响因子和分区

18734197

1873-4197

SLM (selective laser melting) is a very promising manufacturing method for complicated precision parts of metals and alloys. However, deformation of the bridge structure during fabrication process and post treatment is still a typical problem. In this paper, the deformation of aluminum alloy AlSi10Mg flat bridge structure with various span lengths was investigated by numerical simulation and experiment. The longer the span is, the greater arch bending deformation is. A mechanism of deformation of bridge was discussed. During selective laser melting process, the first layer of bridge bends upward because of no constraint. Then the arch bending results less or no powder on it after powder sweeping for next layer. The bridge bends up further during the formation of the following layer. These alternative phenomena cause the evolution of deformation. However, as the bridge becomes thicker and thicker, its stiffness increases, which leads to the difficulty of its further bending. Therefore, after some layers, there is even no further bending during the forming of following layers with the arch shape kept in the initial layers. Decreasing the laser energy density for the bridge area and using supports are helpful for the reduction of the arch bending deformation.
© 2020 The Authors

SLM Bridge AlSi10Mg Deformation Numerical simulation

EI ; SCI

英语

其他

Ministry of Science and Technology of the People's Republic of China[2016YFB1100703]

Materials Science

Materials Science, Multidisciplinary

WOS:000514567900063

Elsevier Ltd

20200207999037

Aluminum alloys ; Arch bridges ; Arches ; Bending (forming) ; Bridges ; Computer simulation ; Deformation ; Melting ; Metallurgy ; Numerical models ; Powder metals ; Selective laser melting

Bridges:401.1 ; Structural Members and Shapes:408.2 ; Metallurgy:531.1 ; Metal Forming:535.2 ; Aluminum Alloys:541.2 ; Computer Applications:723.5 ; Chemical Operations:802.3 ; Mathematics:921

MATERIALS SCIENCE

EV Compendex

1.Department of Mechanical Engineering, Tsinghua University, Beijing; 100084, China
2.School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing; 100044, China
3.School of Materials Science and Engineering, Key Laboratory for Advanced Materials Processing Technology, Tsinghua University, Beijing; 100084, China
4.Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen; 518055, China
5.Beijing e-Plus 3D Tech. Co. Ltd., Beijing; 100027, China

Zhang, Xiaochuan,Wang, Jiwu,Kang, Jinwu,et al. The dynamic arch bending mechanism of flat bridge structure of AlSi10Mg during SLM process[J]. Materials and Design,2020,188.

Zhang, Xiaochuan.,Wang, Jiwu.,Kang, Jinwu.,Rong, Yiming.,Duan, Guoqing.,...&Zheng, Lele.(2020).The dynamic arch bending mechanism of flat bridge structure of AlSi10Mg during SLM process.Materials and Design,188.

Zhang, Xiaochuan,et al."The dynamic arch bending mechanism of flat bridge structure of AlSi10Mg during SLM process".Materials and Design 188(2020).