93W-4.9Ni-2.1Fe alloys strengthened by nanoscale ZrC particles were prepared by spark-plasma-sintering (SPS) and hot rotary swaging, separately. Results show that the addition of a small number of ZrC nanoparticles can refine grains and increase the hardness of the WNiFe alloys, but hinder the formation of the γ-(Ni, Fe) phase during SPS. SPSed WNiFe and WNiFe-ZrC alloys are brittle at room temperature, while the swaged WNiFe and WNiFe-0.5ZrC (wt%) alloys are ductile. At 400 °C, the swaged WNiFe-0.5ZrC alloy exhibits both higher tensile strength and better ductility than the swaged WNiFe. The nanoscale particles distributed in the W grains and γ-(Ni, Fe) phase provide a good pinning effect, which enhances the strength. The thermal conductivity of swaged WNiFe-0.5ZrC is only 71 W·m^-1·K^-1 at room temperature, but it increases to about 100 W·m^-1·K^-1 at 800 °C, which is close to that of pure W (121 W·m^-1·K^-1). These results show the potential of WNiFe alloys as plasma-facing materials in fusion reactor.