Recrystallization and respheroidization of tungsten grains in a tungsten-heavy alloy. Final report

Technical Report · Sat Apr 01 00:00:00 EST 1989

OSTI ID:5738855

Dowding, R J

Refinement of the microstructure of tungsten-heavy alloys, specifically 90 W-7 Ni-3 Fe, was achieved through heavy cold working followed by a heat treatment that recrystallized and respheroidized the tungsten grains. Hydrostatic extrusion of the alloy to reductions of area of 83% and 96% followed by isothermal annealing gives fine, spherical tungsten grains imbedded within the nickel-iron matrix. The finest grain size achieved was 15 microns for the 96% extrusion when subjected to an anneal at 1300 C for 2 hours. The apparent activation energy for the process was found to be 530 kJ/mole. This value indicates that volume diffusion is significant in respheroidizing the grains.

• Research Organization: Army Materials Research Agency, Watertown, MA (USA). Materials Technology Lab.
• OSTI ID: 5738855
• Report Number(s): AD-A-207647/9/XAB; MTL-TR-89-31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TUNGSTEN BASE ALLOYS
MICROSTRUCTURE
ACTIVATION ENERGY
ANNEALING
COLD WORKING
DIFFUSION
EXTRUSION
GRAIN SIZE
HEAT TREATMENTS
HYDROSTATICS
IRON ALLOYS
ISOTHERMS
MICROSPHERES
NICKEL ALLOYS
PROGRESS REPORT
RECRYSTALLIZATION
REFINING
VOLUME
ALLOYS
CRYSTAL STRUCTURE
DOCUMENT TYPES
ENERGY
FABRICATION
MATERIALS WORKING
PROCESSING
SIZE
TUNGSTEN ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies