Full Text:   <2823>

Summary:  <1911>

CLC number: TN249

On-line Access: 2018-02-05

Received: 2017-11-06

Revision Accepted: 2018-01-10

Crosschecked: 2018-01-16

Cited: 0

Clicked: 3885

Citations:  Bibtex RefMan EndNote GB/T7714


Dong-dong Gu


-   Go to

Article info.
Open peer comments

Journal of Zhejiang University SCIENCE A 2018 Vol.19 No.2 P.111-121


Influence of substrate surface morphology on wetting behavior of tracks during selective laser melting of aluminum-based alloys

Author(s):  Jie Liu, Dong-dong Gu, Hong-yu Chen, Dong-hua Dai, Han Zhang

Affiliation(s):  College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; more

Corresponding email(s):   dongdonggu@nuaa.edu.cn

Key Words:  Selective laser melting (SLM), AlSi12, Surface morphology, Single track

Jie Liu, Dong-dong Gu, Hong-yu Chen, Dong-hua Dai, Han Zhang. Influence of substrate surface morphology on wetting behavior of tracks during selective laser melting of aluminum-based alloys[J]. Journal of Zhejiang University Science A, 2018, 19(2): 111-121.

@article{title="Influence of substrate surface morphology on wetting behavior of tracks during selective laser melting of aluminum-based alloys",
author="Jie Liu, Dong-dong Gu, Hong-yu Chen, Dong-hua Dai, Han Zhang",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Influence of substrate surface morphology on wetting behavior of tracks during selective laser melting of aluminum-based alloys
%A Jie Liu
%A Dong-dong Gu
%A Hong-yu Chen
%A Dong-hua Dai
%A Han Zhang
%J Journal of Zhejiang University SCIENCE A
%V 19
%N 2
%P 111-121
%@ 1673-565X
%D 2018
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1700599

T1 - Influence of substrate surface morphology on wetting behavior of tracks during selective laser melting of aluminum-based alloys
A1 - Jie Liu
A1 - Dong-dong Gu
A1 - Hong-yu Chen
A1 - Dong-hua Dai
A1 - Han Zhang
J0 - Journal of Zhejiang University Science A
VL - 19
IS - 2
SP - 111
EP - 121
%@ 1673-565X
Y1 - 2018
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1700599

alSi12 samples were prepared by selective laser melting (SLM) under different processing conditions in order to obtain different top surface morphologies, where single tracks were produced using a fixed processing parameter to reveal the mechanism of the single track on different morphologies. The results show that the morphologies of single tracks changed with roughness of the top surface (Top Ra) of SLM parts, reflected in the variation of wetting angles on the surface processed previously as well as in dimensions of height, width, and depth at the cross-section of each single track. These changes were mainly caused by different wettability and flow behavior of the molten metal under various solidification environments of the single track during SLM. A poor solidification environment in which numerous balls existed limited an effective wetting behavior of molten metal on a previously processed surface of a SLM sample because of an increasing solid-liquid contact area, thus causing dramatical instability of the melt pool and attendant inferior processability of the single track. Meanwhile, under the action of surface tension, the molten metal had a high tendency to transfer into a pore near the single track to form an extending track or flow toward an upper region of melt to form a balling track, hence showing various morphologies of single tracks. This study proposes a theory of the solidification mechanism of single track on the non-ideal surface to provide a better understanding of the SLM processing of Al-Si alloy.


创新点:1. 系统研究在不同加工参数下形成的不同表面形貌的块体上加工同一参数的单道; 2. 基于熔体流动理论,分析在SLM加工过程中已加工层存在的大量的热积累以及粗糙的成形表面对单道的润湿行为的影响.
方法:1. 对在不同形貌的块体上形成的单道进行分析,将单道形貌分为4种典型类型(图4). 2. 通过分析单道横截面的几何尺寸(图5和6),研究表面形貌对单道成形工艺性的影响. 3. 基于Wenzel 方程(公式(3))分析熔体在粗糙表面的润湿行为并基于Navier-Stokes方程(公式(12))和Marangoni方程(公式(13))分析熔体流动行为.
结论:1. 块体表面光滑、平整时,粉末在表面铺展均匀、熔化充分、润湿性好,有利于形成连续、规则的单道. 2. 单道附近的块体表面存在较大孔隙时,孔隙中会积累一定量的粉末.熔融金属的重力和表面张力共同驱使液体向孔隙流动,单道出现扩展效应:润湿角明显减小,熔池宽度和深度增加. 3. 块体表面球化颗粒及飞溅物增多时,表面凹凸不平,单道处熔化的粉末量减少,对基板的润湿性较差,熔池不稳定,导致单道出现颈缩. 4. 块体表面存在大量球化颗粒和飞溅物时,单道附近团聚的铝合金球化颗粒极易被氧化,氧化膜使得颗粒表面光滑,从而难以被熔融金属润湿. 此外,熔融金属的较大的温度梯度对熔体流动方向也有显著影响,易诱导单道出现球化效应.


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


[1]Averyanova M, Cicala E, Bertrand P, et al., 2012. Experimental design approach to optimize selective laser melting of martensitic 17-4 PH powder: part I–single laser tracks and first layer. Rapid Prototyping Journal, 18(1):28-37.

[2]Chandrasekhar S, 1981. Hydrodynamic and Hydromagnetic Stability. Dover Publications, New York, USA, p.109-154.

[3]Das S, 2003. Physical aspects of process control in selective laser sintering of metals. Advanced Engineering Materials, 5(10):701-711.

[4]Ge W, Han S, Fang Y, et al., 2017. Mechanism of surface morphology in electron beam melting of Ti6Al4V based on computational flow patterns. Applied Surface Science, 419:150-158.

[5]Gennes PGD, 1985. Wetting: statics and dynamics. Reviews of Modern Physics, 57(3):827-863.

[6]Gu DD, Yuan PP, 2015. Thermal evolution behavior and fluid dynamics during laser additive manufacturing of Al-based nanocomposites: underlying role of reinforcement weight fraction. Journal of Applied Physics, 118(23):233109.

[7]Gu DD, Meiners W, Wissenbach K, et al., 2012. Laser additive manufacturing of metallic components: materials, processes and mechanisms. International Materials Reviews, 57(3):133-164.

[8]Ishino C, Okumura K, Quere D, 2004. Wetting transitions on rough surfaces. Europhysics Letters (EPL), 68(3):419-425.

[9]Kempen K, Thijs L, Humbeeck JV, et al., 2015. Processing AlSi10Mg by selective laser melting: parameter optimization and material characterization. Materials Science & Technology, 31(8):917-923.

[10]Körner C, 2016. Additive manufacturing of metallic components by selective electron beam melting-a review. International Materials Reviews, 61(5):361-377.

[11]Li XP, Kang CW, Huang H, et al., 2014. Selective laser melting of an Al86Ni6Y4.5Co2La1.5, metallic glass: processing, microstructure evolution and mechanical properties. Materials Science & Engineering: A, 606(2):370-379.

[12]Li XP, Wang XJ, Saunders M, et al., 2015. A selective laser melting and solution heat treatment refined Al-12Si alloy with a controllable ultrafine eutectic microstructure and 25% tensile ductility. Acta Materialia, 95:74-82.

[13]Liu YJ, Liu Z, Jiang Y, et al., 2018. Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg. Journal of Alloys and Compounds, 735: 1414-1421.

[14]Louvis E, Fox P, Sutcliffe CJ, 2011. Selective laser melting of aluminium components. Journal of Materials Processing Technology, 211(2):275-284.

[15]Monroy K, Delgado J, Sereno L, et al., 2015. Geometrical feature analysis of Co-Cr-Mo single tracks after selective laser melting processing. Rapid Prototyping Journal, 21(3):287-300.

[16]Olakanmi EO, Cochrane RF, Dalgarno KW, 2015. A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: processing, microstructure, and properties. Progress in Materials Science, 74:401-477.

[17]Rombouts M, Kruth JP, Froyen L, et al., 2006. Fundamentals of selective laser melting of alloyed steel powders. 56th General Assembly of CIRP, p.187-192.

[18]Sarou-Kanian V, Millot F, Rifflet JC, 2003. Surface tension and density of oxygen-free liquid aluminum at high temperature. International Journal of Thermophysics, 24(1):277-286.

[19]Schwarz-Selinger T, Cahill DG, Chen SC, et al., 2001. Micron-scale modifications of Si, surface morphology by pulsed-laser texturing. Physical Review B, 64(15):155323.

[20]Shen YO, Cantwell W, Li Y, 2014. Skin-core adhesion in high performance sandwich structures. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 15(1):61-67.

[21]Siddique S, Imran M, Wycisk E, et al., 2015. Influence of process-induced microstructure and imperfections on mechanical properties of AlSi12 processed by selective laser melting. Journal of Materials Processing Technology, 221:205-213.

[22]Wang XJ, Zhang LC, Fang MH, et al., 2014. The effect of atmosphere on the structure and properties of a selective laser melted Al-12Si alloy. Materials Science & Engineering: A, 597:370-375.

[23]Wenzel RN, 1936. Resistance of solid surfaces to wetting by water. Industrial & Engineering Chemistry, 28(8):988-994.

[24]Yadroitsev I, Gusarov A, Yadroitsava I, et al., 2010. Single track formation in selective laser melting of metal powders. Journal of Materials Processing Technology, 210(12):1624-1631.

[25]Yadroitsev I, Yadroitsava I, Smurov I, et al., 2012. Factor analysis of selective laser melting process parameters and geometrical characteristics of synthesized single tracks. Rapid Prototyping Journal, 18(3):201-208.

[26]Yadroitsev I, Krakhmalev P, Yadroitsava I, 2014. Selective laser melting of Ti6Al4V alloy for biomedical applications: temperature monitoring and microstructural evolution. Journal of Alloys & Compounds, 583(2):404-409.

[27]Zhang L, Attar H, 2016. Selective laser melting of titanium alloys and titanium matrix composites for biomedical applications: a review. Advanced Engineering Materials, 18(4):463-475.

Open peer comments: Debate/Discuss/Question/Opinion


Please provide your name, email address and a comment

Journal of Zhejiang University-SCIENCE, 38 Zheda Road, Hangzhou 310027, China
Tel: +86-571-87952783; E-mail: cjzhang@zju.edu.cn
Copyright © 2000 - 2024 Journal of Zhejiang University-SCIENCE