Preprint Article Version 1 This version is not peer-reviewed

# Construction of Cellular Substructure in Selective Laser Melting

Version 1 : Received: 4 October 2019 / Approved: 7 October 2019 / Online: 7 October 2019 (11:24:18 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Metals 2019, 9, 1231
DOI: 10.3390/met9111231

## Abstract

Cellular substructure has been widely observed in the sample fabricated by selective laser melting, 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 is distinguished between cell-like dendrite and cell. It is found that, with the increase of scanning velocity, the substructure transits from cell-like dendrite to cell. The critical growth rate of the transition can be around 0.31 ms-1.

## Subject Areas

selective laser melting; substructure; model; growth direction; crystallographic orientation; cell; cell-like dendrite.