Effect of composition, impurities, and processing on the properties of tungsten heavy alloys

Book · Sat Jun 01 00:00:00 EDT 1996

OSTI ID:237707

Spencer, J R ^[1]

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1. Osram Sylvania Inc., Towanda, PA (United States). Chemical and Metallurgical Div.

Because they are liquid-phase sintered, W-Ni-Fe alloys typically sinter to densities of > 99.5% of theoretical density. At tungsten contents above about 96% W, it becomes more difficult to achieve full density. Utilizing a designed experiment, this study determined the effect of various parameters on the density and sintered, grain size of alloys containing 97.3% tungsten. Parameters included in the study were average tungsten particle size, pressing pressure, solid-state sintering temperature, nickel:iron ratio, and liquid-phase sintering temperature. Also a series of tests were run to determine the sensitivity of tungsten heavy alloys to impurities typically found in tungsten powder or introduced during processing. Copper, sodium, aluminum, chromium, and zinc were added at two levels to the tungsten oxide powder than reduced to the metal powder. Microstructural evaluation and mechanical properties were determined for bars sintered from W-Ni-Fe blends of these powders. The effect of quenching these materials was also investigated.

• OSTI ID: 237707
• Report Number(s): CONF-9510290-; ISBN 1-878954-58-X; TRN: 96:013493
• Resource Relation: Conference: International conference on tungsten and refractory metals, their alloys, composites and carbides, McLean, VA (United States), 15-17 Oct 1995; Other Information: PBD: 1996; Related Information: Is Part Of Tungsten and refractory metals 3, proceedings; Bose, A. [ed.] [Parmatech Corp., Petaluma, CA (United States)]; Dowding, R.J. [ed.] [Army Research Lab., Watertown, MA (United States)]; PB: 265 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TUNGSTEN ALLOYS
SINTERING
MICROSTRUCTURE
MECHANICAL PROPERTIES
NICKEL ALLOYS
IRON ALLOYS
POWDERS
PARTICLE SIZE
CHEMICAL COMPOSITION
TEMPERATURE DEPENDENCE
IMPURITIES
COPPER
SODIUM
ALUMINIUM
CHROMIUM
ZINC
QUENCHING
BULK DENSITY
GRAIN SIZE
TENSILE PROPERTIES
ULTIMATE STRENGTH
YIELD STRENGTH
ELONGATION
CHARPY TEST
EXPERIMENTAL DATA