Abstract
The microstructural influence on fracture behavior of tensile and Charpy impact toughness properties were investigated for 90W6Ni2Fe2Co and 90W6Ni2Fe1.5Mo0.5Co tungsten heavy alloys, which are in use of kinetic energy penetrators. The alloys were sintered, heat treated and swaged with 40% reduction in area. Both microstructure and mechanical properties were sensitively dependent on the alloy composition. The WNiFeCo alloy exhibited increased tensile strength, ductility and impact toughness compared to the WNiMo alloy. Fractographic study revealed that the mode of tensile failure changes from flat to sheared tungsten grains for low to high strength tungsten heavy alloys, whereas the fracture behavior changes from flaws/cracks to transgranular cleavage of tungsten grains for low to high Charpy impact toughness alloys. The results indicate that a strong relationship between microstructure, fracture behavior, tensile and impact properties as a function of alloy composition.
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