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

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    Type
    Article
    Authors
    Kim, Youngdeuk
    Kim, Wooseung
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2011-04-15
    Online Publication Date
    2011-04-15
    Print Publication Date
    2012-04
    Permanent link to this record
    http://hdl.handle.net/10754/561753
    
    Metadata
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    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).
    Citation
    Kim, Y.-D., & Kim, W.-S. (2011). Effects of surface shape on the geometry and surface topography of the melt pool in low-power density laser melting. AIChE Journal, 58(4), 998–1011. doi:10.1002/aic.12620
    Publisher
    Wiley
    Journal
    AIChE Journal
    DOI
    10.1002/aic.12620
    ae974a485f413a2113503eed53cd6c53
    10.1002/aic.12620
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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