Abstract
The present report describes the fracture toughness of W-Ni-Fe alloys. These alloys with nickel and iron as the constituent element (91.3-95.5% W/5.8-3.0% Ni/2.9-1.5% Fe) were fabricated by the liquid phase sintering of well grained powders (-2 μm) at 1460-1500°C in hydrogen atmosphere.
The microstructure of liquid sintered tungsten base composites consists of rounded and single crystal tungsten grains in a binder phase.
The fracture toughness of W-Ni-Fe heavy alloys was investigated with GVN slow bend specimens and cracked KIC specimens.
The CVN slow bend tests using standard CVN specimens and the static KIC bend tests using cracked specimens in accordance with the ASTM proposed for practice were carried out in the temperature range -40°C to +20°C.
As the results, it is confirmed that the fracture toughness, energy absorptions and static bending strength are dependent upon the W content, test temperature and strain rates.
