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: 4057
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",
volume="19",
number="2",
pages="111-121",
year="2018",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1700599"
}
%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
TY - JOUR
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
Abstract: 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.
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