Rapid fabrication of materials using directed light fabrication

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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, 3-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. The focal zone of the laser beam is programmed to move along or across a part cross-section, and coupled with a multi-axis sample stage, produces the desired part. By maintaining a constant molten puddle within the focal zone, a continuous liquid/solid interface is ... continued below

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9 p.

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

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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, 3-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. The focal zone of the laser beam is programmed to move along or across a part cross-section, and coupled with a multi-axis sample stage, produces the desired part. By maintaining a constant molten puddle within the focal zone, a continuous liquid/solid interface is possible while achieving constant cooling rates that can be varied between 10 to 10{sup 4} K s{sup -1} and solidification growth rates (that scale with the beam velocity) ranging up to 10{sup 2} m s{sup -1}. The DLF technique offers unique advantages over conventional thermomechanical processes in that many labor and equipment intensive steps can be avoided. Moreover, owing to the flexibility in power distributions of lasers, a variety of materials can be processed, ranging from aluminum alloys to rhenium, and including intermetallics such as Mo{sub 5}Si{sub 3}. As a result, the rapid fabrication of conventional and advanced materials are possible.

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9 p.

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OSTI as DE98000267

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  • THERMEC `97, Wollonging (Australia), 7-11 Jul 1997

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  • Other: DE98000267
  • Report No.: LA-UR--97-1385
  • Report No.: CONF-9707101--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 542062
  • Archival Resource Key: ark:/67531/metadc691239

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  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • March 10, 2016, 1:40 p.m.

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Thoma, D.J.; Lewis, G.K.; Milewski, J.O.; Chen, K.C. & Nemec, R.B. Rapid fabrication of materials using directed light fabrication, article, October 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc691239/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.