Construction of Cellular Substructure in Laser Powder Bed Fusion

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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Construction of Cellular Substructure in Selective Laser Melting

10.20944/preprints201910.0065.v1 ◽

2019 ◽

Author(s):

Yafei Wang ◽

Chenglu Zhang ◽

Chenfan Yu ◽

Leilei Xing ◽

Kailun Li ◽

...

Keyword(s):

Growth Rate ◽

Selective Laser Melting ◽

Crystallographic Orientation ◽

Growth Direction ◽

Euler Angles ◽

Two Dimensional ◽

Single Track ◽

Laser Melting ◽

Scanning Velocity ◽

Cellular Substructure

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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Crystallographic orientation dependence of Charpy impact behaviours in stainless steel 316L fabricated by laser powder bed fusion

Additive Manufacturing ◽

10.1016/j.addma.2021.102104 ◽

2021 ◽

pp. 102104

Author(s):

Xianglong Wang ◽

Oscar Sanchez-Mata ◽

Sıla Ece Atabay ◽

Jose Alberto Muñiz-Lerma ◽

Mohammad Attarian Shandiz ◽

...

Keyword(s):

Stainless Steel ◽

Crystallographic Orientation ◽

Charpy Impact ◽

Orientation Dependence ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Stainless Steel 316L ◽

Powder Bed

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Effects of crystallographic orientation on the corrosion behaviour of stainless steel 316L manufactured by laser powder bed fusion

Corrosion Science ◽

10.1016/j.corsci.2021.110009 ◽

2021 ◽

pp. 110009

Author(s):

Satria Robi Trisnanto ◽

Xianglong Wang ◽

Mathieu Brochu ◽

Sasha Omanovic

Keyword(s):

Stainless Steel ◽

Crystallographic Orientation ◽

Corrosion Behaviour ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Stainless Steel 316L ◽

Powder Bed

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Crystallographic-orientation-dependent tensile behaviours of stainless steel 316L fabricated by laser powder bed fusion

Materials Science and Engineering A ◽

10.1016/j.msea.2019.138395 ◽

2019 ◽

Vol 766 ◽

pp. 138395 ◽

Cited By ~ 13

Author(s):

Xianglong Wang ◽

Jose Alberto Muñiz-Lerma ◽

Mohammad Attarian Shandiz ◽

Oscar Sanchez-Mata ◽

Mathieu Brochu

Keyword(s):

Stainless Steel ◽

Crystallographic Orientation ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Stainless Steel 316L ◽

Powder Bed

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Additive manufacturing of aluminum metal matrix composites: Mechanical alloying of composite powders and single track consolidation with laser powder bed fusion

Additive Manufacturing ◽

10.1016/j.addma.2021.102450 ◽

2021 ◽

pp. 102450

Author(s):

Ethan M. Parsons ◽

Saba Z. Shaik

Keyword(s):

Additive Manufacturing ◽

Metal Matrix ◽

Matrix Composites ◽

Powder Bed Fusion ◽

Single Track ◽

Laser Powder Bed Fusion ◽

Composite Powders ◽

Powder Bed ◽

Aluminum Metal ◽

Aluminum Metal Matrix Composites

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Measurement of the Melt Pool Length During Single Scan Tracks in a Commercial Laser Powder Bed Fusion Process

Volume 2: Additive Manufacturing; Materials ◽

10.1115/msec2017-2942 ◽

2017 ◽

Cited By ~ 6

Author(s):

J. C. Heigel ◽

B. M. Lane

Keyword(s):

Laser Power ◽

High Speed ◽

Infrared Camera ◽

Powder Bed Fusion ◽

Single Track ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Melt Pool ◽

Significant Difference ◽

Scan Speed

This work presents high speed thermographic measurements of the melt pool length during single track laser scans on nickel alloy 625 substrates. Scans are made using a commercial laser powder bed fusion machine while measurements of the radiation from the surface are made using a high speed (1800 frames per second) infrared camera. The melt pool length measurement is based on the detection of the liquidus-solidus transition that is evident in the temperature profile. Seven different combinations of programmed laser power (49 W to 195 W) and scan speed (200 mm/s to 800 mm/s) are investigated and numerous replications using a variety of scan lengths (4 mm to 12 mm) are performed. Results show that the melt pool length reaches steady state within 2 mm of the start of each scan. Melt pool length increases with laser power, but its relationship with scan speed is less obvious because there is no significant difference between cases performed at the highest laser power of 195 W. Although keyholing appears to affect the anticipated trends in melt pool length, further research is required.

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