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Towanda, PA, United States

Irrinki H.,University of Louisville | Dexter M.,Oregon State University | Barmore B.,Oregon State University | Enneti R.,Global Tungsten & Powders Corporation | And 5 more authors.
JOM | Year: 2016

The effects of powders attributes (shape and size distribution) and critical processing conditions (energy density) on the densification and mechanical properties of laser powder bed fusion (L-PBF) 17-4 PH stainless steel were studied using four types of powders. The % theoretical density, ultimate tensile strength and hardness of both water- and gas-atomized powders increased with increased energy density. Gas-atomized powders showed superior densification and mechanical properties when processed at low energy densities. However, the % theoretical density and mechanical properties of water-atomized powders were comparable to gas-atomized powders when sintered at a high energy density of 104 J/mm3. An important result of this study was that, even at high % theoretical density (97% ± 1%), the properties of as-printed parts could vary over a relatively large range (UTS: 500–1100 MPa; hardness: 25–39 HRC; elongation: 10–25%) depending on powder characteristics and process conditions. The results also demonstrate the feasibility of using relatively inexpensive water-atomized powders as starting raw material instead of the typically used gas-atomized powders to fabricate parts using L-PBF techniques by sintering at high energy densities. © 2016, The Minerals, Metals & Materials Society.


Trademark
Global Tungsten & Powders Corporation | Date: 2009-06-23

Chemicals used in manufacturing, namely, phosphors; chemicals used in manufacturing, namely, metal carbide powders and compounds of tungsten and molybdenum; phosphors for use in illuminating devices. Metals and metal alloys in the form of bars, sheets, rods, wire, or powder, for use in manufacturing. Illuminating devices, namely, components for electric lamps, namely, electrodes and current conductors. Illuminating devices, namely, components for electric lamps, namely, filaments.


Gtp

Trademark
Global Tungsten & Powders Corporation | Date: 2011-02-08

Metal carbide powders and compounds of tungsten and molybdenum for use in the production and manufacture of hard metals, cements, catalysts for petroleum refining, catalysts for exhaust gas and off gas purification, catalysts for hydro-cracking, coatings, shape charges, electrical and electronic devices; Phosphors for use in illuminating devices. Metals and metal alloys in the form of bars, sheets, rods, wire, or powder, for use in manufacturing. Illuminating devices, namely, components for electric lamps, namely, electrodes, and current conductors. Illuminating devices, namely, components for electric lamps, namely, filaments.


Trademark
Global Tungsten & Powders Corporation | Date: 2013-05-07

Chemicals used in manufacturing, namely, phosphors; chemicals used in manufacturing, namely, metal carbide powders and compounds of tungsten and molybdenum; phosphors for use in illuminating devices. Metals and metal alloys in the form of bars, sheets, rods, wire, or powder, for use in manufacturing.


Gtp

Trademark
Global Tungsten & Powders Corporation | Date: 2008-06-19

Chemicals used in manufacturing, namely, phosphors; chemicals used in manufacturing, namely, metal carbide powders and compounds of tungsten and molybdenum. Metals and metal alloys in the form of bars, sheets, rods, wire, or powder, for use in manufacturing.

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