Solidification behavior during directed light fabrication

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Description

Directed light fabrication (DLF) is a process that fuses gas delivered metal powders within a focal zone of a laser beam to produce fully dense, 3-dimensional metal components. A variety of materials have been processed with DLF, ranging from steels to tungsten, and including intermetallics such as NiAl and MoSi{sub 2}. To evaluate the processing parameters and resulting microstructures, solidification studies have been performed on defined alloy systems. For example, solidification cooling rates have been determined based upon secondary dendrite arm spacings in Fe-based alloys. In addition, eutectic spacings have been used to define growth velocities during solidification. Cooling rates ... continued below

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7 p.

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Thoma, D.J.; Lewis, G.K. & Nemec, R.B. October 1, 1995.

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Description

Directed light fabrication (DLF) is a process that fuses gas delivered metal powders within a focal zone of a laser beam to produce fully dense, 3-dimensional metal components. A variety of materials have been processed with DLF, ranging from steels to tungsten, and including intermetallics such as NiAl and MoSi{sub 2}. To evaluate the processing parameters and resulting microstructures, solidification studies have been performed on defined alloy systems. For example, solidification cooling rates have been determined based upon secondary dendrite arm spacings in Fe-based alloys. In addition, eutectic spacings have been used to define growth velocities during solidification. Cooling rates vary from 10{sup 1}-10{sup 5} K s{sup {minus}1} and growth rates vary between 1--50 mm s{sup {minus}1}. As a result, process definition has been developed based upon the microstructural development during solidification. The materials explored were Ag-19Cu, Fe-24.8Ni, 316 stainless steel, Al-33Cu, W, MoSi{sub 2} and NiAl.

Physical Description

7 p.

Notes

INIS; OSTI as DE96001379

Source

  • Materials Week `95, Cleveland, OH (United States), 29 Oct - 2 Nov 1995

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  • Other: DE96001379
  • Report No.: LA-UR--95-3332
  • Report No.: CONF-951026--5
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/119969 | External Link
  • Office of Scientific & Technical Information Report Number: 119969
  • Archival Resource Key: ark:/67531/metadc622872

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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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  • October 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 26, 2016, 5:50 p.m.

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Thoma, D.J.; Lewis, G.K. & Nemec, R.B. Solidification behavior during directed light fabrication, report, October 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc622872/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.