Accession Number:

ADA207647

Title:

The Recrystallization and Respheroidization of Tungsten Grains in a Tungsten-Heavy Alloy

Descriptive Note:

Final rept.

Corporate Author:

ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s):

Report Date:

1989-04-01

Pagination or Media Count:

23.0

Abstract:

Refinement of the microstructure of tungsten-heavy alloys, specifically 90 W-7 Ni-3 Fe, has been 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 kJmole. This value indicates that volume diffusion is significant in respheroidizing the grains.

Subject Categories:

  • Metallurgy and Metallography
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE