Construction of Cellular Substructure in Laser Powder Bed Fusion
by
Yafei Wang 1, Chenglu Zhang 1, Chenfan Yu 1, Leilei Xing 1, Kailun Li 1, Jinhan Chen 1, Jing Ma 1, Wei Liu 1,* and Zhijian Shen 1,2,*
Yafei Wang 1, Chenglu Zhang 1, Chenfan Yu 1, Leilei Xing 1, Kailun Li 1, Jinhan Chen 1, Jing Ma 1, Wei Liu 1,* and Zhijian Shen 1,2,*
1
State Key Laboratory of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2
Arrhenius Laboratory, Department of Materials and Environment Chemistry, Stockholm University, S-106 91 Stockholm, Sweden
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(11), 1231; https://doi.org/10.3390/met9111231
Received: 4 October 2019 / Revised: 7 November 2019 / Accepted: 13 November 2019 / Published: 18 November 2019
(This article belongs to the Special Issue Additive Manufacturing of Metals with Lasers)
Cellular substructure has been widely observed in the sample fabricated by laser powder bed fusion, while its growth direction and the crystallographic orientation have seldom been studied. This research tries to build a general model to construct the substructure from its two-dimensional morphology. All the three Bunge Euler angles to specify a unique growth direction are determined, and the crystallographic orientation corresponding to the growth direction is also obtained. Based on the crystallographic orientation, the substructure in the single track of austenitic stainless steel 316L is distinguished between the cell-like dendrite and the cell. It is found that, with the increase of scanning velocity, the substructure transits from cell-like dendrite to cell. When the power is 200 W, the critical growth rate of the transition in the single track can be around 0.31 ms−1.
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Keywords:
laser powder bed fusion; substructure; model; growth direction; crystallographic orientation; cell; cell-like dendrite
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MDPI and ACS Style
Wang, Y.; Zhang, C.; Yu, C.; Xing, L.; Li, K.; Chen, J.; Ma, J.; Liu, W.; Shen, Z. Construction of Cellular Substructure in Laser Powder Bed Fusion. Metals 2019, 9, 1231.
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