Effects of surface shape on the geometry and surface topography of the melt pool in low-power density laser melting

Handle URI:
http://hdl.handle.net/10754/561753
Title:
Effects of surface shape on the geometry and surface topography of the melt pool in low-power density laser melting
Authors:
Kim, Youngdeuk; Kim, Wooseung
Abstract:
The quantitative correlations between workpiece volume and melt pool geometry, as well as the flow and thermal features of the melt pool are established. Thermocapillary convections in melt pool with a deformable free surface are investigated with respect to surface shape and laser intensity. When the contact angle between the tangent to the top surface and the vertical wall at the hot center is acute, the free surface flattens, compared with that of the initial free surface. Otherwise, the free surface forms a bowl-like shape with a deep crater and a low peripheral rim when the contact angle at the hot center is obtuse. Increasing the workpiece volume at a fixed laser intensity and a negative radial height gradient cause linear decreases in the geometric size and magnitude of flow and temperature of the melt pool. Conversely, linear increases are observed with a positive radial height gradient. © 2011 American Institute of Chemical Engineers (AIChE).
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Water Desalination & Reuse Research Cntr
Publisher:
Wiley
Journal:
AIChE Journal
Issue Date:
15-Apr-2011
DOI:
10.1002/aic.12620
Type:
Article
ISSN:
00011541
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorKim, Youngdeuken
dc.contributor.authorKim, Wooseungen
dc.date.accessioned2015-08-03T09:03:50Zen
dc.date.available2015-08-03T09:03:50Zen
dc.date.issued2011-04-15en
dc.identifier.issn00011541en
dc.identifier.doi10.1002/aic.12620en
dc.identifier.urihttp://hdl.handle.net/10754/561753en
dc.description.abstractThe quantitative correlations between workpiece volume and melt pool geometry, as well as the flow and thermal features of the melt pool are established. Thermocapillary convections in melt pool with a deformable free surface are investigated with respect to surface shape and laser intensity. When the contact angle between the tangent to the top surface and the vertical wall at the hot center is acute, the free surface flattens, compared with that of the initial free surface. Otherwise, the free surface forms a bowl-like shape with a deep crater and a low peripheral rim when the contact angle at the hot center is obtuse. Increasing the workpiece volume at a fixed laser intensity and a negative radial height gradient cause linear decreases in the geometric size and magnitude of flow and temperature of the melt pool. Conversely, linear increases are observed with a positive radial height gradient. © 2011 American Institute of Chemical Engineers (AIChE).en
dc.publisherWileyen
dc.subjectCurved free surfaceen
dc.subjectFree surface flowen
dc.subjectLaser meltingen
dc.subjectNumerical analysisen
dc.subjectSurface topographyen
dc.subjectThermocapillary convectionen
dc.titleEffects of surface shape on the geometry and surface topography of the melt pool in low-power density laser meltingen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.identifier.journalAIChE Journalen
dc.contributor.institutionDept. of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Koreaen
dc.contributor.institutionDept. of Mechanical Engineering, Hanyang University, 1271 Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, South Koreaen
kaust.authorKim, Youngdeuken
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