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Microcomputed tomography analysis of intralayer porosity generation in laser direct metal deposition and its causes
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10.2351/1.3582311
/content/lia/journal/jla/23/2/10.2351/1.3582311
http://aip.metastore.ingenta.com/content/lia/journal/jla/23/2/10.2351/1.3582311

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the laser direct metal deposition system.

Image of FIG. 2.
FIG. 2.

Microcomputed tomography setup: (a) schematic diagram of MicroCT sample preparation and (b) schematic diagram of MicroCT measurement.

Image of FIG. 3.
FIG. 3.

Particle size distribution of the powder samples: (a) gas-atomized powder and (b) PREP powder.

Image of FIG. 4.
FIG. 4.

SEM micrograph showing surface morphologies of (a) gas-atomized powder and (b) PREP powder.

Image of FIG. 5.
FIG. 5.

MicroCT images at a particular slice of (a) gas-atomized powder and (b) PREP powder.

Image of FIG. 6.
FIG. 6.

MicroCT images of two orthogonal slices and the porosity (indicated by yellow color spheres) in whole volume under analysis: (a) gas-atomized powder and (b) PREP powder.

Image of FIG. 7.
FIG. 7.

SEM micrograph showing interlayer and intralayer porosity: (a) gas-atomized deposition sample at 1000 W and , and (b) PREP deposition sample at 800W and .

Image of FIG. 8.
FIG. 8.

3D surface generation intralayer porosity (red and purple spheres) of microcomputed tomography data of full thin-wall deposition samples: (a) GA, 800 W, ; (b) PREP, 800 W, and thin-wall with only two first layers; (c) GA, 800 W, ; (d) PREP, 800 W, ; (e) GA, 1000 W, ; (f) PREP, 1000 W, .

Image of FIG. 9.
FIG. 9.

Intralayer porosity measured using microcomputed tomography data of gas-atomized and PREP deposition samples: (a) laser power 800 W and (b) laser power 1000 W.

Image of FIG. 10.
FIG. 10.

Pore diameter frequency distribution in deposition samples at mass flow rate and (a) GA, 800 W; (b) PREP, 800 W; (c) GA, 1000 W; and (d) PREP, 1000 W.

Image of FIG. 11.
FIG. 11.

Pore diameter frequency distribution in deposition samples at mass flow rate and (a) GA, 800 W; (b) PREP, 800 W; (c) GA, 1000 W; and (d) PREP, 1000 W.

Image of FIG. 12.
FIG. 12.

Change of pore diameter as a function of mass flow rate in deposition samples: (a) maximum pore diameter and (b) mean pore diameter.

Tables

Generic image for table
TABLE I.

Processing parameters for laser direct metal deposition.

Generic image for table
TABLE II.

Quantitative porosity results of the powder volume used in analysis.

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/content/lia/journal/jla/23/2/10.2351/1.3582311
2011-05-06
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microcomputed tomography analysis of intralayer porosity generation in laser direct metal deposition and its causes
http://aip.metastore.ingenta.com/content/lia/journal/jla/23/2/10.2351/1.3582311
10.2351/1.3582311
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