Abstract
Some parameters characteristic of the configuration of secondary recrystallized grains grown in powder metallurgy tungsten wires are defined after making clear their contours three-dimensionally. The change in shape of the grains increases with an increase in heating rate and a decrease in annealing temperature, the trend of which is more clearly revealed in non-doped tungsten wire. The parameters reliably reflect such a change in the three-dimensional shape of various grains. It is then investigated through the parameters how the grain configuration influences the steady state creep rate. The effect of grain configuration to suppress creep rates can be confirmed only when the area of grain boundary is not largely changed.
