Popis: |
Prealloyed micron-sized powders, with two volume fractions (0.52 and 0.74) of nanograined dispersions of (Fe, Mo)6C in Fe, were produced by a spray conversion process. The average grain size of both phases in the as-synthesized powders was found to be 50 nm by X-ray line broadening. The carbide grain size of pressureless sintered material was around 0.6-1.3 μm. Hot pressing reduced the consolidation temperature by ∼300°C and the carbide grain size of the hot-pressed material to about 200–300 nm. |