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Additive effects on the microstructure and properties of tungsten heavy-alloy composites

Technical Report ·
OSTI ID:7124052
; ; ;
Tungsten heavy alloys are two phase Tungsten-Nickel-Iron composites made by liquid-phase sintering elemental powders. Heavy alloys are typically worked and strain aged after sintering to produce high strengths. This precludes near net shape forming, which is an inherent advantage of powder processing. Refractory metal additions can alter Tungsten solution and reprecipitation during sintering and also provide solid-solution strengthening. This approach allows the manufacture of near net shape parts with mechanical properties approaching those of conventional alloys subjected to working and strain aging. Experiments have been conducted with molybdenum, tantalum, and rhenium additions. These elements are mutually soluble in both the Tungsten grains and the liquid phase, which influences the grain size and the constituent phase hardnesses. The strength and hardness after sintering and heat treatment are superior to that of unmodified heavy alloys in the same condition and also compare well with conventional alloys subjected to moderate levels of post-sintering deformation. Among the additives used, Re showed the best combination of properties including the highest sintered density. Net shape forming of these high-strength alloys is being explored. Recent efforts have focused on powder injection molding 82W-8Mo-8Ni-2Fe alloy.
Research Organization:
Rensselaer Polytechnic Inst., Troy, NY (USA). Dept. of Materials Engineering
OSTI ID:
7124052
Report Number(s):
AD-A-218540/3/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ADDITIVES
ALLOYS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DENSITY
DISPERSIONS
ELEMENTS
FABRICATION
FLUIDS
GRAIN SIZE
HEAT TREATMENTS
IRON ALLOYS
LIQUIDS
MATERIALS
MECHANICAL PROPERTIES
METALLURGY
METALS
MICROSTRUCTURE
MIXTURES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
PHYSICAL PROPERTIES
POWDER METALLURGY
POWDERS
PRECIPITATION
PROCESSING
REFRACTORY METALS
RHENIUM
RHENIUM ALLOYS
SEPARATION PROCESSES
SHAPE
SINTERING
SIZE
SOLID SOLUTIONS
SOLUTIONS
TANTALUM
TANTALUM ALLOYS
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN ALLOYS