Construction of Cellular Substructure in Selective Laser Melting

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.

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Construction of Cellular Substructure in Laser Powder Bed Fusion

Metals ◽

10.3390/met9111231 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1231 ◽

Cited By ~ 1

Author(s):

Yafei Wang ◽

Chenglu Zhang ◽

Chenfan Yu ◽

Leilei Xing ◽

Kailun Li ◽

...

Keyword(s):

Crystallographic Orientation ◽

Growth Direction ◽

Two Dimensional ◽

Powder Bed Fusion ◽

Single Track ◽

Laser Powder Bed Fusion ◽

Stainless Steel 316L ◽

Scanning Velocity ◽

Powder Bed ◽

Cellular Substructure

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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An investigation into melting modes in selective laser melting of Inconel 625 powder: single track geometry and porosity

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-021-07105-3 ◽

2021 ◽

Author(s):

Subin Shrestha ◽

Kevin Chou

Keyword(s):

Selective Laser Melting ◽

Inconel 625 ◽

Single Track ◽

Laser Melting ◽

Track Geometry

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Selective Laser Melting of Single Track on Ti–6Al–4V Powder: Experimentation and Finite Element Analysis

Arabian Journal for Science and Engineering ◽

10.1007/s13369-019-04263-1 ◽

2019 ◽

Vol 45 (2) ◽

pp. 1173-1180 ◽

Cited By ~ 2

Author(s):

Manowar Hussain ◽

Pranshul Gupta ◽

P. Kumar ◽

A. K. Das

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Selective Laser Melting ◽

Single Track ◽

Laser Melting ◽

Element Analysis

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A numerical investigation on the physical mechanisms of single track defects in selective laser melting

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2018.06.073 ◽

2018 ◽

Vol 126 ◽

pp. 957-968 ◽

Cited By ~ 38

Author(s):

C. Tang ◽

J.L. Tan ◽

C.H. Wong

Keyword(s):

Numerical Investigation ◽

Selective Laser Melting ◽

Single Track ◽

Laser Melting ◽

Physical Mechanisms

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Track evolution and surface characteristics of selective laser melting Ti6Al4V

Rapid Prototyping Journal ◽

10.1108/rpj-01-2018-0004 ◽

2018 ◽

Vol 24 (9) ◽

pp. 1554-1562 ◽

Cited By ~ 4

Author(s):

Luo Zhang ◽

Haihong Zhu ◽

Jiahe Liu ◽

Xiaoyan Zeng

Keyword(s):

Surface Morphology ◽

Selective Laser Melting ◽

Surface Characteristics ◽

Scanning Speed ◽

Bulk Sample ◽

Three Dimension ◽

Single Track ◽

Heat Accumulation ◽

Laser Melting ◽

Content Type

Purpose The purpose of this paper is to investigate the track evolution and surface characteristics of selective laser melting Ti6Al4V. Design/methodology/approach In the present paper, Ti6Al4V single-track, multi-track and bulk sample were formed at different scanning speed by selective laser melting (SLM). Then, the surface morphology, three-dimension profile and surface roughness were evaluated. The width of the single and multi-track was measured and compared. Findings The results showed that the heat accumulation played a great role on the evolution of tracks and surface characteristics from single-track to multi-track and to bulk. The surface morphology of the subsequent tracks became more regular when the single-track was irregular at the same high scanning speed. The width of last track Wn was always larger than that of the first track W1. The Ra of the top of the bulk increased with the increase of the scanning speed, this trend was as same as the Ra of the single-track, but the trend of Ra of the side was opposite. Originality/value The effect of heat accumulation on the track evolution and surface characteristics is obtained. The results can help to derive a smooth surface with a regular and continuous track in SLM.

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