Abstract
The potassium doped tungsten (W–K) grade was achieved via swaging+rolling process. The swaged+rolled W–K alloy exhibited acceptable thermal conductivity of 159.1W/mK and ductile-to-brittle transition temperature of about 873K while inferior mechanical properties attributed to the coarse pores and small deformation degree. Then the thermal shock, fatigue resistance of the W–K grade were characterized by an electron beam facility. Thermal shock tests were conducted at absorbed power densities varied from 0.22 to 1.1GW/m2 in a step of 0.22GW/m2. The cracking threshold was in the range of 0.44–0.66GW/m2. Furthermore, recrystallization occurred in the subsurface of the specimens tested at 0.66–1.1GW/m2 basing on the analysis of microhardness and microstructure. Thermal fatigue tests were performed at 0.44GW/m2 up to 1000cycles and no cracks emerged throughout the tests. Moreover, recrystallization occurred after 1000cycles.
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