Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg

Zhou, Suyuan1,2,3; Su, Yang1; Gu, Rui1; Wang, Zhenyu1; Zhou, Yinghao1; Ma, Qian4; Yan, Ming1

2019-01

10.3390/ma12010073

Materials   影响因子和分区

1996-1944

The influences of processing parameters such as volumetric energy density (epsilon) and, particularly, defocusing amount (DA) on densification, microstructure, tensile property, and hardness of the as-printed dense AlSi10Mg alloy by selective laser melting (SLM) were studied systematically. The molten pool boundaries (MPBs) were found overwhelmingly at regular and complex spatial topological structures affected by DA value to exist in two forms, while the "layer-layer" MPB overlay mutually and the "track-track" MPBs intersect to form acute angles with each other. The microstructure of MPBs exhibits a coarse grain zone near the MPBs and the characteristics of segregation of nonmetallic elements (O, Si) where the crack easily happened. The DA value (-2 to 2 mm) affected both the density and the tensile mechanical properties. High tensile strength (456 +/- 14 MPa) and good tensile ductility (9.5 +/- 1.4%) were achieved in the as-printed condition corresponding to DA = 0.5 mm. The tensile fracture surface features were analyzed and correlated to the influence of the DA values.

aluminum alloys selective laser melting (SLM) mechanical properties

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Commission[ZDSYS201703031748354]

Materials Science

Materials Science, Multidisciplinary

WOS:000456410200073

MDPI

20185306321962

3D printers ; Aluminum alloys ; Density (specific gravity) ; Light modulators ; Melting ; Microstructure ; Tensile strength

Aluminum Alloys:541.2 ; Printing Equipment:745.1.1 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

Web of Science

1.South Univ Sci & Technol China, Shenzhen Key Lab Addit Mfg High Performance Mat, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Wuhan Univ, Minist Educ, Key Lab Artificial Micro & Nanomat, Wuhan 430072, Hubei, Peoples R China
3.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Hubei, Peoples R China
4.RMIT Univ, Sch Engn, Ctr Addit Mfg, Melbourne, Vic 3000, Australia

Zhou, Suyuan,Su, Yang,Gu, Rui,et al. Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg[J]. Materials,2019,12(1).

Zhou, Suyuan.,Su, Yang.,Gu, Rui.,Wang, Zhenyu.,Zhou, Yinghao.,...&Yan, Ming.(2019).Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg.Materials,12(1).

Zhou, Suyuan,et al."Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg".Materials 12.1(2019).