Free-form processing of near-net shapes using directed light fabrication

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Description

Directed light fabrication (DLF) is a rapid fabrication process that fuses gas delivered metal powders within a focal zone of a laser beam to produce fully dense, near-net shape, three-dimensional metal components from a computer generated solid model. Computer controls dictate the metal deposition pathways, and no preforms or molds are required to generate complex sample geometries with accurate and precise tolerances. The DLF technique offers unique advantages over conventional thermomechanical processes or thermal spray processes in that many labor and equipment intensive steps can be avoided to produce components with fully dense microstructures. Moreover, owing to the flexibility in ... continued below

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9 p.

Creation Information

Thoma, D.J.; Lewis, G.K.; Milewski, J.O. & Nemec, R.B. May 1, 1997.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Materials Science and Technology Div., NM (United States)
    Place of Publication: New Mexico

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Description

Directed light fabrication (DLF) is a rapid fabrication process that fuses gas delivered metal powders within a focal zone of a laser beam to produce fully dense, near-net shape, three-dimensional metal components from a computer generated solid model. Computer controls dictate the metal deposition pathways, and no preforms or molds are required to generate complex sample geometries with accurate and precise tolerances. The DLF technique offers unique advantages over conventional thermomechanical processes or thermal spray processes in that many labor and equipment intensive steps can be avoided to produce components with fully dense microstructures. Moreover, owing to the flexibility in power distributions of lasers, a variety of materials have been processed, ranging from aluminum alloys to tungsten, and including intermetallics such as Mo{sub 5}Si{sub 3}. Since DLF processing offers unique capabilities and advantages for the rapid fabrication of complex metal components, an examination of the microstructural development has been performed in order to define and optimize the processed materials. Solidification studies of DLF processing have demonstrated that a continuous liquid/solid interface is maintained while achieving high constant cooling rates that can be varied between 10 to 10{sup 5} K s{sup {minus}1} and solidification growth rates ranging up to the 10{sup {minus}2} m s{sup {minus}1}.

Physical Description

9 p.

Notes

INIS; OSTI as DE98001532

Source

  • 15. international thermal spray conference, Nice (France), 25-29 May 1997

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  • Other: DE98001532
  • Report No.: LA-UR--97-3884
  • Report No.: CONF-9705215--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 658324
  • Archival Resource Key: ark:/67531/metadc707585

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 1, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

Description Last Updated

  • Nov. 3, 2016, 1:35 p.m.

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Thoma, D.J.; Lewis, G.K.; Milewski, J.O. & Nemec, R.B. Free-form processing of near-net shapes using directed light fabrication, article, May 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc707585/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.